epidemiology exam answer writing definitions measures of disease frequency study designs

~/

epidemiology study design AND disease frequency

~/attachments/9573f3d8-7054-4c9d-aa99-a45790bb23ec

mkdir -p "/tmp/workspace/epidemiology_exam_answers/src" "/tmp/workspace/epidemiology_exam_answers/output" && python -c "import pdfplumber, os files=['/tmp/workspace/attachments/9573f3d8-7054-4c9d-aa99-a45790bb23ec/9ca2ed10-de67-4217-a80f-248960a3fcd9.pdf','/tmp/workspace/attachments/9573f3d8-7054-4c9d-aa99-a45790bb23ec/epidem merge.pdf'] out=['/tmp/workspace/epidemiology_exam_answers/src/questions.txt','/tmp/workspace/epidemiology_exam_answers/src/lecture.txt'] for f,o in zip(files,out): with pdfplumber.open(f) as pdf: with open(o,'w',encoding='utf-8') as h: h.write('PAGES: '+str(len(pdf.pages))+'\\n\\n') for i,p in enumerate(pdf.pages,1): h.write('\\n===== PAGE '+str(i)+' =====\\n') h.write((p.extract_text() or '[No extractable text]')+'\\n') print(os.path.basename(f),len(pdf.pages))"

python -c "from pathlib import Path s=Path('/tmp/workspace/epidemiology_exam_answers/src/lecture.txt').read_text(encoding='utf-8') terms=['EPIDEMIC PROCESS','Gromashevsky','SOURCE OF INFECTION','TRANSMISSION MECHANISM','DISINFECTION','STERILIZATION','DISINSECTION','DERATIZATION','IMMUNOPROPHYLAXIS','LIVE VACCINES','INACTIVATED','CHOLERA','PLAGUE','RABIES','INFLUENZA','HEPATITIS B','HEPATITIS C','ANTHRAX','MALARIA','HEMORRHAGIC'] for term in terms: print('\\n###',term) pos=0; n=0 while True: p=s.lower().find(term.lower(),pos) if p<0:break a=s.rfind('===== PAGE',0,p);b=s.find('===== PAGE',p) print(s[a:b if b>0 else len(s)][:700].replace('\\n',' ')) pos=p+len(term);n+=1 if n>=3:break" > "/tmp/workspace/epidemiology_exam_answers/src/topic_excerpts.txt"

python - <<'PY' from pathlib import Path from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.enums import TA_CENTER from reportlab.lib import colors from reportlab.lib.units import cm from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak, KeepTogether from reportlab.pdfbase.pdfmetrics import stringWidth out=Path('/tmp/workspace/epidemiology_exam_answers/output/Epidemiology_Exam_Answers.pdf') answers = [ ('1. Epidemiology as a fundamental medical science', ['Definition: study of the distribution and determinants of health-related states/events in specified populations, and application of this study to control health problems.','Purpose: identify causes and risk groups; describe disease by time, place and person; plan, evaluate and improve prevention and health services.','Sections: general epidemiology, epidemiology of infectious diseases, non-communicable disease epidemiology, social/environmental/clinical epidemiology, and epidemiological surveillance.','Structure: descriptive epidemiology -> analytic epidemiology -> experimental/interventional epidemiology -> surveillance and control.']), ('2. Development of epidemiological methodology. Epidemiological method', ['Early method: observation of epidemics and practical control measures. Modern method uses population comparison, measurement and inference.','Epidemiological method: systematic study of disease occurrence and its determinants in populations to support prevention and control.','Content: define population/case; collect and analyse data; describe by person-place-time; formulate hypotheses; test them by analytic/experimental studies; implement and evaluate interventions.','Main designs: descriptive studies, cross-sectional, case-control, cohort, ecological and randomized controlled trials.']), ('3. Stages of development of epidemiology', ['Pre-bacteriological period: observations of epidemics; miasmatic and contagionist ideas; quarantine and sanitation. Hippocrates linked disease with airs, waters and places.','Bacteriological period, late 19th century: Pasteur, Koch and others established microbial causation; laboratory diagnosis, disinfection, vaccines and serum prophylaxis developed.','Modern period: epidemiology expanded from infections to all population health outcomes; uses statistics, surveillance, analytic studies and evidence-based prevention.']), ('4. Miasmatic and contagionist theories', ['Miasmatic theory: epidemics were attributed to harmful substances or “bad air” from soil, swamps or decaying matter. It encouraged environmental sanitation.','Contagionist theory: disease was caused by a transmissible living/contagious agent passed from the sick to the susceptible. It supported isolation, quarantine and disinfection.','The debate stimulated observation and control practice. Bacteriology ultimately provided strong evidence for infectious agents, while environment remains relevant as a determinant of transmission.']), ('5. Great bacteriological discoveries and significance', ['Pasteur demonstrated the role of microorganisms, developed pasteurization and vaccines; Koch formulated principles linking specific organisms to specific diseases and improved laboratory methods.','Other discoveries identified agents and vectors of many infections.','Significance: transformed epidemiology from speculation to etiological science; enabled specific diagnosis, isolation, disinfection, vaccination, serum therapy and rational surveillance.']), ('6. Modern epidemiology: structure and content', ['Object: population health, including infectious and non-infectious diseases, injuries, exposures and health services.','Core functions: surveillance; outbreak investigation; measurement of frequency; identification of determinants; assessment of interventions; forecasting and planning.','Core tools: descriptive analysis, analytic observational studies, trials, screening evaluation, biostatistics and risk communication.','Applied aim: prevention and reduction of disease burden in populations.']), ('7. Parasitic system and Gromashevsky doctrine', ['Parasitic system: interaction of pathogen and host population, shaped by biological, social and environmental conditions.','Epidemic process: emergence and spread in a population of specific infectious states, including disease and carriage.','Gromashevsky described three indispensable links: source of infection, mechanism of transmission, and susceptible population. If any link is interrupted, sustained transmission stops.','Formation depends on pathogen-host interaction plus social and natural factors.']), ('8. Sources of infection', ['Source of infection: infected human or animal in which the pathogen normally lives, multiplies and from which it can be released. It is not simply an inanimate contaminated object.','Categories: human sources in anthroponoses; animal sources in zoonoses; environmental reservoirs in sapronoses.','Clinically, overt cases are easier to recognize but carriers, mild/atypical and incubating infections may be epidemiologically more important because they remain undetected.']), ('9. Sick person as source of infection', ['Infectivity differs by disease and phase: incubation, prodrome, clinical illness, convalescence and carriage.','Patients are often most contagious when pathogen shedding is high. In some infections transmission begins before symptoms or continues after recovery.','Typical, severe cases may be isolated early; mild, atypical and asymptomatic cases are frequently missed and may maintain spread.','Control: early detection, notification, isolation/treatment, safe handling of excreta/secretions, contact management.']), ('10. Animals as sources of infection', ['Zoonoses are infections naturally transmitted between vertebrate animals and humans. Domestic, farm, wild and synanthropic animals may act as sources/reservoirs.','Wild and synanthropic rodents are important because they maintain pathogens in nature, live near humans and support ectoparasite vectors.','Human infection occurs by direct contact/bites, exposure to tissues or excreta, food/water contamination, inhalation of aerosols, and arthropod vectors.','Prevention: veterinary control, rodent control, food safety, personal protection and vector control.']), ('11. Transmission mechanisms', ['Transmission mechanism: evolutionarily established movement of a pathogen from infected host to susceptible host.','Three stages: release from infected organism -> persistence/movement in external environment or vector -> entry into susceptible organism.','Main mechanisms: airborne (aerosol), fecal-oral, contact, vector-borne, vertical and artificial/parenteral.','Factors are vehicles such as air, water, food, hands, fomites, blood or vectors; routes are the practical paths through them.']), ('12. Airborne transmission', ['Pathogens exit mainly from respiratory tract in droplets/aerosols. Transmission may be by close-range droplets, fine aerosols that remain suspended, or contaminated dust in selected infections.','Control: prompt diagnosis and isolation; respiratory hygiene and masks as indicated; ventilation/air filtration; reduce crowding; cleaning; vaccination where available.','Airborne precautions require appropriate respirators and negative-pressure facilities when indicated.']), ('13. Fecal-oral transmission', ['Pathogen leaves via feces and enters through mouth. Major routes: water-borne, food-borne and household/contact through hands and fomites.','Water outbreaks may be explosive and widespread; food outbreaks are often linked to a common meal/handler; household spread is favored by poor hand hygiene.','Control: safe water and sewage, food hygiene and heat treatment, handwashing, sanitary inspection, disinfection of excreta/objects, early case detection and vaccination where applicable.']), ('14. Contact transmission', ['Contact mechanism applies chiefly to pathogens localized on skin, mucosa or external lesions.','Direct contact: skin/mucosal contact, sexual contact, bites. Indirect contact: contaminated hands, instruments, linen, surfaces or other fomites.','Control: hand hygiene, aseptic technique, gloves/PPE when indicated, cleaning-disinfection/sterilization, safe sex, treatment/isolation of cases and avoidance of sharing personal items.']), ('15. Vector-borne transmission', ['A vector, usually an arthropod, transfers pathogen between hosts. Mechanical transfer is passive contamination; biological transfer requires development and/or multiplication in the vector.','Important in zoonoses because vectors connect animal reservoirs and humans; can also occur in anthroponoses, for example malaria.','Control: vector surveillance and source reduction, insecticide-treated barriers, repellents, protective clothing, targeted insecticides, early diagnosis/treatment and reservoir control when appropriate.']), ('16. Vertical transmission', ['Vertical transmission is mother-to-child spread before birth, during delivery or through breastfeeding.','Agents may cross placenta, infect during passage through the birth canal, or be transmitted in breast milk.','Consequences include fetal loss, congenital infection, prematurity or neonatal disease.','Prevention: antenatal screening, maternal vaccination/treatment where indicated, safe delivery measures and neonatal immunoprophylaxis.']), ('17. Artificial transmission', ['Artificial or iatrogenic transmission occurs through medical/non-medical invasive procedures that breach skin or mucosa: injections, transfusion, transplantation, dialysis, surgery, tattooing and unsafe drug injection.','Main risks are contaminated blood, needles, equipment or inadequate processing.','Prevention: standard precautions, sterile single-use supplies where possible, validated cleaning-disinfection-sterilization, blood donor screening, injection safety, sharps safety and waste control.']), ('18. Social, natural and biological factors', ['Social factors: population density, sanitation, water supply, migration, conflict, health-service access, behavior and vaccine coverage.','Natural factors: climate, season, landscape, reservoirs, vectors and natural foci.','Biological factors: pathogen infectivity/virulence and survival, host susceptibility/immunity, age and comorbidity, and vector competence.','These factors interact to determine intensity, seasonality and geographic distribution of the epidemic process.']), ('19. Belyakov theory of self-regulation', ['Belyakov explained epidemic processes as self-regulating parasitic systems. Heterogeneity of pathogen populations and host susceptibility drives cyclic changes.','Selection occurs in both pathogen and host populations; changes in immunity, virulence, transmission and environment alter epidemic activity.','Practical value: surveillance should identify risk groups, phases and conditions favorable to transmission, then direct timely targeted prevention rather than relying on uniform measures alone.']), ('20. Pavlovsky natural focality', ['Natural focus: a geographically bounded ecosystem in which a pathogen circulates independently among wild animal hosts and vectors under natural conditions. Humans are accidental hosts after entering or altering the focus.','Structure: pathogen, reservoir hosts, vectors when present, and a suitable landscape/climate.','Functioning is sustained by biocenotic relationships and seasonal ecology.','Prevention: landscape and vector surveillance, personal protection, occupational measures and warning/limiting exposure in risk areas.']), ('21. Cherkassky socio-ecological concept', ['The epidemic process is viewed as a socio-ecological system: biological parasitic interactions occur within a changing social and natural environment.','Its components include pathogen, host population, reservoirs/vectors, environmental conditions, human behavior and public-health response.','Practical implication: control requires combined biomedical, environmental, social and organizational measures.']), ('22. Anti-epidemic measures', ['Grouping by target: 1) source of infection - detection, notification, isolation, diagnosis and treatment; 2) transmission mechanism - sanitation, disinfection, disinsection, safe water/food and PPE; 3) susceptible population - immunization, chemoprophylaxis and health education.','Grouping by purpose: preventive measures before disease and measures in an epidemic focus after detection.','Performers: public-health/epidemiology services, clinicians, laboratories, infection-control teams, sanitation/veterinary/vector-control services, local authorities and the public.']), ('23. Disinfection', ['Disinfection is destruction or inactivation of pathogenic microorganisms on environmental objects; it does not necessarily destroy bacterial spores.','Types: prophylactic disinfection when a source is absent/unknown; focal disinfection when a source exists, subdivided into current and terminal disinfection.','Methods: mechanical, physical, chemical and biological.','Importance: interrupts indirect transmission through secretions, equipment, surfaces, linen, water and waste.']), ('24. Physical disinfection and chamber disinfection', ['Physical methods include heat, boiling, steam, dry heat, burning/incineration, ultraviolet irradiation and other physical agents. Heat and steam are generally reliable when validated.','Chamber disinfection uses controlled steam, hot air or chemical vapor in a chamber for articles such as bedding, clothing and selected equipment.','Indications: contaminated articles from a focus that cannot be safely treated by simple surface disinfection, especially bulky textiles and materials requiring controlled processing.']), ('25. Chemical disinfection', ['Chemical disinfection uses approved agents such as chlorine-releasing compounds, alcohols, oxidizing agents, aldehydes, quaternary ammonium compounds and others. Choice depends on intended use and local guidance.','Selection criteria: spectrum, concentration/contact time, material compatibility, safety, stability, ease of use, organic-load performance and cost.','Effectiveness is reduced by wrong dilution, inadequate cleaning, organic matter, insufficient contact time, low temperature, poor coverage and resistant organisms/spores.']), ('26. Sterilization', ['Sterilization is destruction/removal of all forms of viable microorganisms, including bacterial spores. It is essential for critical devices entering sterile tissue or the vascular system and prevents healthcare-associated infections.','Methods: steam autoclave, dry heat, low-temperature gas/plasma or liquid chemical systems, and radiation for industrial products.','Steam is effective, rapid and economical for heat-stable items; low-temperature systems suit heat-sensitive devices but may cost more and require strict safety/compatibility controls.']), ('27. Sterilization methods, quality control and pre-cleaning', ['Pre-sterilization cleaning: immediately contain/transport safely -> disassemble as instructed -> clean manually or mechanically with detergent/enzymatic solution -> rinse -> dry -> inspect -> package and label.','Cleaning must precede sterilization because organic soil blocks the sterilant.','Quality control: physical parameters for every cycle, chemical indicators inside/outside packs, and periodic biological indicators. Document load, cycle and release decision.','If indicators fail, do not use the load; investigate, repeat processing and correct the cause.']), ('28. Disinsection', ['Disinsection is control/destruction of arthropods of epidemiological or sanitary importance. It may be preventive or focal.','Methods: environmental sanitation/source reduction, mechanical/physical methods, biological control and chemical insecticides.','By entry: contact poisons, intestinal poisons, fumigants; some have systemic action. Forms: solutions, sprays, aerosols, powders, baits, treated nets.','Larvicides kill larvae, ovicides kill eggs, imagocides kill adult insects. Repellents deter bites but do not necessarily kill vectors.']), ('29. Deratization', ['Deratization is rodent control. Preventive measures remove food, water, shelter and entry routes; extermination measures reduce existing populations.','Forms: continuous/systematic control in high-risk settings and focal/emergency control around outbreaks.','Methods: sanitation and proofing, trapping, biological methods and rodenticides. Rodenticides include acute toxicants and anticoagulants; use must be professionally supervised to protect people, animals and environment.']), ('30. Artificial immunity and population immunity', ['Active artificial immunity follows vaccination: slower onset, longer duration and immune memory. Passive immunity follows immunoglobulin/antiserum: immediate but temporary protection, no memory.','Population immunity reduces the probability that susceptible persons meet an infectious source. Its protective threshold varies with transmissibility, vaccine effectiveness and contact patterns.','Immunity is affected by age, nutrition, immune status, maternal antibody, dose/schedule, vaccine storage/administration, pathogen variation and time since immunization.']), ('31. Immunoprophylaxis in prevention', ['Immunoprophylaxis is a central measure directed at the susceptible population. It prevents disease, reduces severe outcomes and, for some infections, reduces transmission.','Routine vaccination maintains population immunity; targeted vaccination protects occupational, travel and medical risk groups; post-exposure vaccination can prevent selected infections.','Its importance is greatest where an effective vaccine exists and where interruption of transmission or prevention of severe disease is feasible.']), ('32. Artificial active immunity and vaccine types', ['Active immunization uses antigen to induce adaptive immune response and memory.','Types: live attenuated, inactivated whole organism, toxoid, subunit/recombinant protein, polysaccharide/conjugate, viral-vector and nucleic-acid vaccines.','Indications: routine age-based programs, risk groups, travel/occupation and outbreak/post-exposure use according to product guidance.','Effectiveness depends on antigen type, schedule, host response and match with circulating agent; many non-live vaccines need multiple doses/boosters.']), ('33. Live vaccines', ['Live attenuated vaccines contain organisms weakened to replicate limitedly without causing disease in immunocompetent recipients. Attenuation is achieved by controlled passage or genetic methods.','They often induce strong, long-lasting humoral and cellular immunity, sometimes after one dose, and may mimic natural infection.','Limitations: cold-chain sensitivity; generally avoid in severe immunodeficiency and pregnancy unless a specific authoritative recommendation says otherwise; rare vaccine-associated illness/reversion risk for selected products.']), ('34. Non-live vaccines', ['Non-live vaccines include inactivated whole-organism, toxoid, subunit/recombinant, polysaccharide/conjugate and nucleic-acid products. They cannot replicate or cause the target infection.','They are generally safer for immunocompromised persons but usually need adjuvants, primary series and boosters.','Immunity is mainly antibody-mediated, though product type varies. Reactogenicity is commonly local pain, fever or transient systemic symptoms; serious events are uncommon and require assessment.']), ('35. Emergency prevention', ['Emergency prophylaxis is action after exposure or when imminent risk exists, before disease develops.','Types: active vaccination, passive immunoglobulin/antitoxin/antiserum, antimicrobial chemoprophylaxis, or a combination.','Choice depends on disease, time since exposure, immunity of the exposed person, wound/exposure severity and product availability. Begin urgently when indicated and follow the local protocol.']), ('36. Passive-immunity preparations', ['Preparations: normal human immunoglobulin, specific/hyperimmune immunoglobulin, monoclonal antibodies in selected settings, and antitoxins/antisera.','Properties: immediate protection, short duration, no immune memory; products differ in specificity, half-life and risk of reactions.','Uses: post-exposure prophylaxis, toxin neutralization, replacement in selected antibody deficiencies and protection of high-risk persons when active immunity is too slow or contraindicated.']), ('37. Russian vaccination calendar, 2021', ['The National Preventive Vaccination Calendar organizes routine vaccines by age and risk/epidemic indications. It includes early-life protection, primary series and revaccinations, plus vaccines for defined risk groups.','Typical routine targets include hepatitis B, tuberculosis, pneumococcal disease, diphtheria-tetanus-pertussis, polio, Hib for indicated groups, measles-mumps-rubella and influenza for eligible groups.','The uploaded question refers to the 2021 version. Calendar orders change: for an exam use the version taught locally; for practice always verify the current official Russian Ministry of Health schedule.']), ('38. Vaccination of health workers', ['Health workers require routine age-appropriate vaccines plus occupational protection based on exposure assessment.','Common priorities: hepatitis B, influenza annually, COVID-19 where recommended, measles-mumps-rubella/varicella for nonimmune staff, diphtheria-tetanus boosters, and additional vaccines for laboratory, travel or outbreak risk.','Maintain documented immunity, offer post-exposure management, and apply standard precautions regardless of vaccination status.']), ('39. Contraindications and delayed vaccination', ['True permanent contraindications are few: severe anaphylaxis to a previous dose/component and severe immunodeficiency for relevant live vaccines. Encephalopathy temporally linked to pertussis vaccine may contraindicate further pertussis-containing doses.','Temporary deferral may be needed for moderate/severe acute illness, certain immunosuppressive therapy or recent blood products for some live vaccines. Mild illness, antibiotics and stable chronic disease usually are not contraindications.','Reschedule once the condition resolves using catch-up principles. Vaccination outside the calendar follows risk, travel, outbreak or post-exposure indications.']), ('40. Adverse events following immunization', ['AEFI: any untoward medical event after immunization, not necessarily caused by the vaccine. Categories include vaccine product reaction, quality defect-related reaction, immunization error-related reaction, anxiety-related reaction and coincidental event.','Assessment: timing, known causal pattern, clinical diagnosis, batch/procedure review, alternative causes and, when needed, laboratory investigation.','Prevention: screen contraindications, maintain cold chain, correct preparation/route/dose, observe recipients after vaccination, ensure emergency readiness and report/investigate serious events.']), ('41. Anthroponoses', ['Anthroponoses are infections for which humans are the principal reservoir/source sustaining transmission.','Examples: measles, pertussis, diphtheria, poliomyelitis, many respiratory viral infections and typhoid fever.','Control emphasizes detection and management of human cases/carriers, interruption of human-to-human transmission and immunization when available.']), ('42. Zoonoses', ['Zoonoses are infections naturally maintained in vertebrate animals and transmissible to humans. Human-to-human spread is usually absent or limited, depending on disease.','Examples: rabies, brucellosis, anthrax, plague, leptospirosis and many tick-borne infections.','Control links human, veterinary and environmental sectors: animal vaccination/control, food safety, vector control, occupational protection and surveillance.']), ('43. Sapronoses', ['Sapronoses are infections in which the agent can persist and/or multiply in non-living environmental substrates such as soil, water, decaying organic matter or built water systems.','Examples often cited include legionellosis, tetanus and some environmental mycoses.','Control emphasizes environmental monitoring, engineering controls, sanitation and reduction of relevant exposure.']), ('44. Healthcare-associated infections (HAIs)', ['HAI is an infection acquired during healthcare delivery that was not present or incubating at admission; it also includes occupational infections in staff related to care.','Risk factors: invasive devices/procedures, surgery, critical illness, prolonged stay, antimicrobial exposure, breaks in asepsis and contaminated equipment/environment. High-risk groups include ICU, neonates, elderly, immunocompromised and device-dependent patients.','Surveillance: standard case definitions, denominator data, laboratory linkage, incidence/device-associated rates, outbreak detection, feedback and audit of prevention bundles.']), ('45. Cholera', ['Cholera is acute intestinal infection caused by toxigenic Vibrio cholerae, mainly O1 or O139, producing profuse watery diarrhea and dehydration.','Source: infected person or carrier; environmental aquatic persistence may contribute. Transmission is fecal-oral, chiefly through contaminated water and food, and hands/fomites.','Modern concern: rapid outbreaks where water, sanitation and access to treatment fail. Prevention: safe water/sanitation, food hygiene, surveillance, rapid rehydration/case management and oral cholera vaccines in indicated settings.']), ('46. Preventing introduction/spread of cholera', ['Maintain epidemiological and laboratory surveillance, notification and readiness at borders/travel points and in risk territories.','Ensure safe drinking water, sewage disposal, food safety and sanitary inspection; monitor water sources and wastewater where indicated.','At a suspected case: isolate/manage promptly, collect specimens, investigate source/contacts, apply focal disinfection, reinforce hygiene and risk communication.','Use oral cholera vaccination strategically according to official public-health guidance; coordinate health, water, sanitation and local authorities.']), ('47. Plague', ['Plague is an acute zoonotic infection caused by Yersinia pestis. Natural reservoirs are chiefly wild rodents; fleas are important vectors.','Transmission: flea bites, direct contact with infected animal tissues/secretions, and respiratory droplets from pneumonic plague.','Modern plague persists in natural foci; pneumonic cases can cause rapid person-to-person outbreaks. Prevention: surveillance in natural foci, rodent/flea control, protective measures, rapid diagnosis/isolation and contact prophylaxis as directed. Specific vaccine use is restricted to defined risk settings under national policy.']), ('48. Crimean-Congo hemorrhagic fever (CCHF)', ['CCHF is a severe tick-borne viral zoonosis. Reservoir/amplifying hosts include wild and domestic animals; Hyalomma ticks are key vectors.','Transmission: tick bite/crushing, contact with blood/tissues of viremic animals, and contact with blood/body fluids of patients. Healthcare-associated transmission can occur.','Prevention in foci: tick avoidance, protective clothing/repellents, safe animal handling/slaughter, standard and barrier precautions, prompt isolation and contact monitoring. No routine widely used vaccine; local protocols govern management.']), ('49. Rabies epidemiology', ['Rabies is an almost universally fatal encephalitis once symptoms begin, caused by lyssaviruses. Dogs are the major global source; bats and wild carnivores are important in many regions.','Transmission occurs when infectious saliva enters broken skin or mucosa, usually through bites or scratches; rarely via other exposures.','Control: mass dog vaccination, control of stray animals, public education, immediate wound care and prompt post-exposure prophylaxis.']), ('50. Rabies immunoprophylaxis', ['Planned pre-exposure prophylaxis is for persons with sustained risk, such as rabies laboratory staff, animal handlers and certain field workers/travelers. It uses modern cell-culture rabies vaccine according to local schedule.','Post-exposure prophylaxis: immediate vigorous washing/flushing of wound, rabies vaccine promptly, and rabies immunoglobulin for severe category III exposures when indicated. Do not delay because the animal is unavailable.','Exact doses, injection sites and schedules differ by national protocol and product. Follow the current local/Russian official instruction or WHO protocol, especially for previously vaccinated people and immunocompromised patients.']), ('51. Three categories of animal-bite exposure', ['WHO Category I: touching/feeding animals or licks on intact skin - no PEP if history is reliable; wash exposed area.','Category II: nibbling of uncovered skin or minor scratches/abrasions without bleeding - immediate wound care plus vaccine.','Category III: single/multiple transdermal bites or scratches, saliva on broken skin/mucosa, or bat exposure - wound care, vaccine and rabies immunoglobulin if not previously vaccinated.','Observe/test the animal only where this is safe and authorized; never postpone urgent PEP without public-health guidance.']), ('52. Measures in particularly dangerous infection areas', ['Ensure immediate notification, isolation and safe referral; obtain specimens with biosafety precautions and laboratory coordination.','Conduct case investigation, active case finding, contact listing/monitoring, risk-based prophylaxis and movement/visitor controls as authorized.','Apply transmission-based PPE, terminal/current disinfection, environmental and vector/reservoir measures when relevant, and accurate risk communication.','Coordinate incident management with public health, clinical care, laboratories, emergency services and veterinary/environmental agencies.']), ('53. Anti-plague suit', ['An anti-plague suit is specialized PPE for high-consequence infections, selected according to route of transmission and procedure risk. Components may include impermeable protective clothing, gloves, boots/shoe covers, head covering, eye/face protection and a fit-tested respirator when aerosol risk exists.','Donning: inspect -> hand hygiene -> inner clothing/boots -> gown/coverall -> respirator -> eye/face protection -> gloves, with trained observer/checks.','Doffing is the highest-risk step: remove slowly in designated area with hand hygiene between steps, avoiding contamination of skin/clothes; remove respirator last after leaving contaminated area when applicable. Follow facility protocol exactly.']), ('54. Influenza epidemiology and outbreak measures', ['Influenza is an acute viral respiratory infection transmitted mainly through respiratory droplets/aerosols and close contact; incubation is short and transmission can start before or near symptom onset.','Seasonality and antigenic drift cause annual epidemics; antigenic shift in influenza A can produce pandemics.','Outbreak control: prompt detection/testing as available, isolate symptomatic persons, respiratory hygiene/masks, ventilation, hand hygiene, cleaning, protect high-risk persons, antiviral treatment/prophylaxis when indicated and annual vaccination.']), ('55. Viral hepatitis B', ['HBV is a DNA virus with high infectivity and environmental stability. Blood and certain body fluids are infectious; HBsAg indicates current infection and HBeAg generally signals higher replication/infectivity.','Reservoir: humans with acute infection or chronic infection/carriage. Chronic carriers, including asymptomatic persons, are epidemiologically important.','Transmission: perinatal, sexual, parenteral and household exposure to blood-contaminated items. Prevention: vaccination, blood safety, injection/sharps safety, screening in pregnancy and post-exposure management.']), ('56. Viral hepatitis C', ['HCV is an RNA virus with substantial genetic variability and a high tendency to chronic infection.','Reservoir: humans with acute or chronic infection, often asymptomatic; chronic infection sustains transmission.','Transmission is predominantly blood-borne: unsafe injection, contaminated equipment, transfusion in unscreened settings and needle sharing. Sexual/perinatal transmission occurs less efficiently but risk rises with blood exposure.','There is no vaccine; prevention relies on blood safety, sterile procedures, harm reduction, testing and curative antiviral treatment.']), ('57. Occupational HBV/HCV risk in health workers', ['Risk follows percutaneous injury, mucosal splash or contact of non-intact skin with blood/body fluids. Higher risk occurs with hollow-bore needles, deep injury, visible blood and high-viremia source.','Prevention: standard precautions, hepatitis B vaccination with documented response where indicated, safety-engineered devices, no needle recapping, sharps containers, PPE, safe waste and training.','After exposure: wash/flush, report immediately, assess source and worker, test according to protocol. HBV PEP may include vaccine and/or HBIG; HCV has no PEP but needs early testing and follow-up.']), ('58. Anthrax', ['Anthrax is a zoonosis caused by spore-forming Bacillus anthracis. Herbivores are usual sources; spores persist in soil and animal products.','Human infection follows contact with infected animals/carcasses or hides/wool, ingestion of contaminated meat, inhalation of spores, or rarely injection exposure.','Prevention: veterinary vaccination/control, safe carcass disposal, protective occupational practices, avoidance of meat from sick animals and surveillance. Human vaccine is for selected high-risk groups under national policy.']), ('59. Malaria', ['Malaria is caused by Plasmodium parasites and transmitted primarily by infective female Anopheles mosquitoes. Humans with blood-stage infection are the source for mosquitoes; P. vivax/ovale hypnozoites permit relapse.','Other routes: congenital transmission, transfusion, needle exposure and organ transplantation.','Control: early diagnosis and effective treatment, vector control (nets, indoor residual spraying, larval source management), repellents/protective clothing, surveillance and travel chemoprophylaxis where indicated. In focus investigation, seek imported cases and local vector conditions.']), ('60. Viral hemorrhagic fevers', ['Viral hemorrhagic fevers are severe febrile illnesses caused by several RNA-virus families, often zoonotic or vector-borne, with capillary leak, bleeding tendency and shock in severe disease.','Examples: CCHF, Ebola and Marburg disease, Lassa fever, yellow fever, dengue and Rift Valley fever.','Epidemiology varies: reservoirs may be rodents, bats or primates; vectors may be ticks or mosquitoes; some spread person-to-person through blood/body fluids.','Control: early recognition/isolation, strict PPE and infection control, safe specimens/burials, vector/reservoir measures, contact tracing and disease-specific vaccination where available.'])] styles=getSampleStyleSheet() styles.add(ParagraphStyle(name='TitleX',parent=styles['Title'],fontName='Helvetica-Bold',fontSize=17,leading=21,alignment=TA_CENTER,textColor=colors.HexColor('#17365D'),spaceAfter=10)) styles.add(ParagraphStyle(name='SubX',parent=styles['Normal'],fontSize=8.5,leading=11,alignment=TA_CENTER,textColor=colors.HexColor('#555555'),spaceAfter=13)) styles.add(ParagraphStyle(name='H',parent=styles['Heading2'],fontName='Helvetica-Bold',fontSize=11.2,leading=14,textColor=colors.HexColor('#17365D'),spaceBefore=7,spaceAfter=3,keepWithNext=True)) styles.add(ParagraphStyle(name='B',parent=styles['BodyText'],fontSize=8.7,leading=11.2,leftIndent=10,firstLineIndent=-7,spaceAfter=1.4)) styles.add(ParagraphStyle(name='Foot',parent=styles['Normal'],fontSize=7.2,leading=9,textColor=colors.HexColor('#555555'))) def footer(canvas,doc): canvas.saveState(); canvas.setStrokeColor(colors.HexColor('#B7C9DA')); canvas.line(1.5*cm,1.25*cm,19.5*cm,1.25*cm) canvas.setFont('Helvetica',7.5); canvas.setFillColor(colors.HexColor('#555555')) canvas.drawString(1.5*cm,0.82*cm,'Epidemiology exam answers | Prepared from the uploaded lecture') canvas.drawRightString(19.5*cm,0.82*cm,f'Page {doc.page}') canvas.restoreState() doc=SimpleDocTemplate(str(out),pagesize=A4,rightMargin=1.5*cm,leftMargin=1.5*cm,topMargin=1.35*cm,bottomMargin=1.6*cm,title='Epidemiology Exam Answers') story=[Paragraph('Epidemiology: Exam-Oriented Answers',styles['TitleX']),Paragraph('Short-to-medium, point-wise notes for the 60 questions in the uploaded exam paper',styles['SubX']),Paragraph('<b>Use:</b> Learn the bold concepts and reproduce the bullets in your own words. These are revision notes, not a substitute for current official clinical/public-health protocols. Questions referring to Russian regulations, vaccine schedules or doses must be checked against the current local official instruction.',styles['Foot']),Spacer(1,7)] for title, bullets in answers: story.append(Paragraph(title,styles['H'])) for b in bullets: story.append(Paragraph('• '+b,styles['B'])) story.append(Spacer(1,3)) doc.build(story,onFirstPage=footer,onLaterPages=footer) print(out, out.stat().st_size) PY python -c "from pypdf import PdfReader; p='/tmp/workspace/epidemiology_exam_answers/output/Epidemiology_Exam_Answers.pdf'; r=PdfReader(p); print('pages',len(r.pages)); print(r.pages[0].extract_text()[:200]); print(r.pages[-1].extract_text()[:150])"

~/epidemiology_exam_answers

python - <<'PY' from pathlib import Path p=Path('/tmp/workspace/epidemiology_exam_answers/src/generate_answers.py') content=r'''from reportlab.lib import colors from reportlab.lib.enums import TA_CENTER from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak, KeepTogether from reportlab.pdfbase.ttfonts import TTFont from reportlab.pdfbase import pdfmetrics from reportlab.lib.colors import HexColor from xml.sax.saxutils import escape OUT='/tmp/workspace/epidemiology_exam_answers/output/Epidemiology_Exam_Answers.pdf' # Short, oral-exam style answers, organised according to the supplied 60-question paper. answers = [ ('1. Epidemiology: purpose, sections and structure', [ 'Definition: the science of the occurrence, distribution and determinants of health-related states in populations, and application of this knowledge to prevention and control.', 'It is the basic science of public health. In infectious-disease epidemiology, the subject is the epidemic process and methods for its prevention and control.', 'Purposes: describe disease by person, place and time; identify causes and risk factors; assess interventions; plan surveillance and health services; prevent disease.', 'Structure: general epidemiology (methods and principles), epidemiology of infectious diseases, epidemiology of non-communicable diseases, hospital epidemiology, environmental/social epidemiology, and epidemiological surveillance.' ]), ('2. Formation of epidemiological methodology. Epidemiological method', [ 'Epidemiology developed from observation of outbreaks, quarantine and sanitary practice, then from bacteriology, statistics and analytic study designs.', 'Epidemiological method: a population-based method for studying distribution, determinants and control of disease. It compares groups and uses quantitative measures.', 'Core steps: define the problem and case; collect valid data; describe by time-place-person; formulate a hypothesis; test it with analytic studies; implement and evaluate control.', 'Main methods: surveillance, descriptive studies, cross-sectional, case-control, cohort and experimental/intervention studies.' ]), ('3. Stages in development of epidemiology', [ 'Pre-bacteriological stage: observations of epidemics and environmental conditions; miasmatic and contagionist ideas; isolation and quarantine were used.', 'Bacteriological stage: Pasteur, Koch and others established specific microbial causation; laboratory diagnosis, disinfection, sera and vaccines expanded.', 'Modern stage: studies the epidemic process as interaction of agent, host, environment and social factors; employs surveillance, statistics, field investigation and prevention programs.' ]), ('4. Miasmatic and contagionist theories', [ 'Miasmatic theory: epidemics were attributed to harmful “miasmas” from air, soil, swamps or decaying material. It promoted environmental sanitation but did not explain specific transmission.', 'Contagionist theory: disease is transmitted from the ill or infected source to susceptible persons, directly or through the environment.', 'The long debate stimulated observation and public-health measures. Bacteriology ultimately confirmed the specific infectious-agent basis of contagion.' ]), ('5. Great bacteriological discoveries and significance', [ 'Pasteur demonstrated the role of microorganisms, developed principles of attenuation and vaccines. Koch established methods of culture, staining and causal proof for specific bacteria.', 'Significance: enabled etiologic diagnosis, identification of reservoirs and transmission routes, rational isolation, disinfection, sterilization, vaccination and scientific outbreak control.', 'It shifted epidemiology from general speculation to evidence-based study of specific agents and their spread.' ]), ('6. Modern epidemiology: structure and content', [ 'Modern epidemiology studies both infectious and non-infectious conditions at population level.', 'Content: surveillance; measurement of morbidity/mortality; descriptive and analytic epidemiology; causal inference; risk assessment; prevention; evaluation of health interventions.', 'For infection, it studies the epidemic process, reservoirs, transmission mechanisms, population susceptibility and anti-epidemic measures.' ]), ('7. Parasitic system and Gromashevsky doctrine of epidemic process', [ 'Parasitic system: biologic interaction between parasite/pathogen and host population, modified by environment and social conditions.', 'Epidemic process: emergence and spread of specific infectious states, including disease and carriage, in a population.', 'Gromashevsky identified three indispensable links: source of infection, mechanism of transmission, and susceptible host/population.', 'Formation requires a viable pathogen, sufficient shedding, an effective route and a susceptible population. Breaking any link interrupts spread.' ]), ('8. Sources of infection: concept and categories', [ 'Source of infection is an infected human or animal in which the pathogen normally lives, multiplies and from which it is shed to a susceptible host.', 'Categories: human sources (patient, convalescent, carrier); animal sources (domestic, synanthropic and wild animals); and, for some infections, environmental reservoirs.', 'Epidemiologic importance depends on duration/intensity of shedding, mode of transmission, contact rate and possibility of early detection.' ]), ('9. Sick person as source of infection', [ 'A patient may shed pathogen during incubation, prodromal, acute and convalescent periods; timing differs by disease.', 'Greatest risk often occurs before diagnosis or during mild/atypical illness because persons remain active in the community.', 'Clinical forms: typical, mild, atypical, inapparent/subclinical and chronic infection. Carriers may be transient, convalescent or chronic.', 'Control: early diagnosis, notification, isolation when indicated, treatment, hygiene, contact management and disinfection.' ]), ('10. Animals as sources of infection', [ 'Zoonotic sources include ill animals and asymptomatic carriers. Domestic animals, livestock and wildlife may maintain infection.', 'Wild and synanthropic rodents are important reservoirs because of their abundance, mobility, proximity to humans and association with ectoparasite vectors.', 'Humans acquire infection by bites/scratches, contact with tissues/excreta, aerosol/dust, food or water contamination, and vectors such as ticks or fleas.', 'Prevention: veterinary surveillance, vaccination/control of animal disease, rodent control, vector control and safe handling of animals/products.' ]), ('11. Transmission mechanisms of pathogens', [ 'Transmission mechanism is the evolutionary way a pathogen moves from infected to susceptible host.', 'It has three stages: exit from infected organism, survival/movement in the external environment, and entry into a susceptible host.', 'Main mechanisms: respiratory (aerogenic), fecal-oral, contact, vector-borne, vertical and artificial/parenteral.', 'Factors are objects carrying the pathogen, such as air, water, food, hands, instruments, blood, soil or vectors. A route is the particular way exposure occurs.' ]), ('12. Air-borne transmission and control', [ 'Pathogens are released mainly in respiratory secretions. Droplet transmission occurs at short range; airborne/aerosol transmission involves fine particles that remain suspended; dust may carry some resistant organisms.', 'Examples include influenza and many respiratory infections.', 'Control: early detection and isolation, respiratory etiquette, masks/respirators when indicated, ventilation and air filtration, cleaning, reduction of crowding, vaccination and protection of staff.' ]), ('13. Fecal-oral transmission and control', [ 'Pathogens leave in feces and enter through the mouth. Routes: water-borne, food-borne, household/contact through contaminated hands and objects.', 'It is favored by unsafe water, poor sanitation, inadequate sewage disposal and poor food hygiene.', 'Control: safe water and sewerage, hand hygiene, sanitary food production/cooking/storage, protection of water sources, prompt detection of cases, disinfection and vaccination where available.' ]), ('14. Contact transmission and control', [ 'Contact mechanism is typical of pathogens localized on skin, mucosae or wounds.', 'Direct contact: skin-to-skin, sexual contact, bites. Indirect contact: contaminated hands, linen, instruments, dressings, toys or other fomites.', 'Control: hand hygiene, gloves/PPE when indicated, aseptic technique, cleaning and disinfection of objects, safe injection practice, isolation precautions, treatment of cases and contacts.' ]), ('15. Vector-borne transmission and control', [ 'An arthropod vector transfers pathogen between hosts. Mechanical transmission carries organisms without development; biological transmission involves multiplication and/or development in the vector.', 'It is prominent in zoonoses, but may occur in anthroponoses when humans are the main reservoir.', 'Control: vector surveillance, elimination of breeding sites, insecticides/larvicides, repellents, protective clothing and screens, treatment of reservoirs/cases and community education.' ]), ('16. Vertical transmission', [ 'Vertical transmission is mother-to-child spread before birth, during labor/delivery or after birth, including via breastfeeding for certain agents.', 'Consequences include fetal loss, congenital infection, prematurity or neonatal disease.', 'Prevention: antenatal screening, maternal vaccination or treatment where indicated, safe delivery practices, neonatal prophylaxis and appropriate infant-feeding advice.' ]), ('17. Artificial transmission: prevention', [ 'Artificial or parenteral transmission results from invasive medical/non-medical procedures that breach skin or mucosa: injections, transfusion, surgery, dialysis, endoscopy, tattooing and drug injection.', 'It is especially relevant to blood-borne infections such as hepatitis B, hepatitis C and HIV.', 'Prevention: standard precautions, sterile single-use equipment, validated disinfection/sterilization, donor screening, safe sharps disposal, injection safety and occupational post-exposure procedures.' ]), ('18. Social, natural and biological factors in epidemic process', [ 'Biological: pathogen virulence, infective dose, shedding, immunity, host age/genetics/nutrition and vectors/reservoirs.', 'Natural: climate, season, landscape, water, soil, wildlife and vector ecology.', 'Social: population density, migration, housing, sanitation, behavior, health care, work conditions, conflict and vaccination coverage.', 'These factors interact and determine time, place and intensity of transmission.' ]), ('19. Belyakov self-regulation theory', [ 'The theory explains periodic changes in epidemic activity through self-regulation of parasite-host populations under environmental and social influence.', 'Pathogen heterogeneity and host susceptibility change over time. Selection favors strains and host groups that sustain transmission; population immunity subsequently reduces it.', 'Practical value: supports surveillance, forecasting, targeted prevention and explanation of seasonality and epidemic cycles.' ]), ('20. Pavlovsky natural focality theory', [ 'A natural focus is a geographically defined ecosystem in which a pathogen circulates continuously among wild animal reservoirs and vectors independently of humans.', 'Its structure: pathogen, reservoir hosts, vectors when relevant, landscape/biocenosis and environmental conditions.', 'Humans are accidental hosts when entering or altering the focus. Prevention relies on mapping foci, surveillance, personal protection, vector control and risk communication.' ]), ('21. Epidemic process as a socio-ecological system', [ 'Cherkassky viewed the epidemic process as a system shaped by biologic, ecological and social components.', 'Agent-host interactions occur within ecosystems, while population behavior, health systems, urbanization and economy alter exposure and control.', 'This approach supports integrated action: medical, veterinary, environmental and social measures.' ]), ('22. Anti-epidemic measures: grouping and performers', [ 'Measures are grouped by the link targeted: 1) source of infection, 2) transmission mechanism, 3) susceptible population.', 'Examples: case finding/isolation/treatment; sanitation, disinfection, disinsection and safe water; immunoprophylaxis, chemoprophylaxis and health education.', 'They may also be preventive or focal (implemented in response to a case/outbreak).', 'Performers: public-health and clinical services, laboratories, hospitals, sanitary authorities, veterinary services, local administration and the community.' ]), ('23. Disinfection: definition, types and importance', [ 'Disinfection is destruction or inactivation of pathogenic microorganisms on environmental objects, usually not reliably including all bacterial spores.', 'Types: prophylactic disinfection when a source is absent/unknown; focal disinfection when a source is present. Focal disinfection is current (while source remains) or terminal/final (after removal of source).', 'Methods: mechanical, physical, chemical and biological.', 'It interrupts transmission through contaminated objects, water, food, surfaces, secretions and equipment.' ]), ('24. Physical disinfection and chamber disinfection', [ 'Physical methods use heat, fire/incineration, boiling, steam, ultraviolet light and other physical agents. They are dependable when correct temperature/time is achieved.', 'Boiling and steam are suitable for heat-resistant items; UV is adjunctive and depends on direct exposure; burning is used for appropriate waste.', 'Chamber disinfection uses controlled steam, hot air or gas conditions for articles such as bedding, clothing and textiles.', 'Indications: items from a focus that cannot be safely washed/disinfected on site, especially after severe contagious infections or ectoparasite infestation.' ]), ('25. Chemical disinfection', [ 'Chemical disinfection uses agents such as chlorine-releasing compounds, alcohols, aldehydes, oxidizing agents, quaternary ammonium compounds and phenolics, selected for the task.', 'Select an agent based on spectrum, concentration, contact time, compatibility, toxicity, stability, cost and environmental safety.', 'Efficacy is affected by organic matter, microbial load/type, concentration, temperature, pH, exposure time and quality of pre-cleaning.', 'Always clean first when possible and follow validated product instructions.' ]), ('26. Sterilization and nosocomial infection prevention', [ 'Sterilization destroys all forms of microorganisms, including bacterial spores.', 'It is essential for critical instruments entering sterile tissue or the vascular system and prevents health-care-associated infections.', 'Methods: moist heat/steam, dry heat, gas or low-temperature chemical methods, radiation and filtration for suitable materials.', 'Steam is rapid, reliable and non-toxic for heat-stable devices; low-temperature methods suit heat-sensitive devices but require strict validation and may be slower/costlier.' ]), ('27. Sterilization methods, quality control and pre-sterilization cleaning', [ 'Workflow: collect safely, disassemble if applicable, pre-clean, wash with detergent/enzymatic solution, rinse, dry, inspect, package, sterilize, store correctly.', 'Cleaning removes soil and organic matter and is mandatory before high-level disinfection or sterilization.', 'Quality control: physical cycle parameters, chemical indicators in/around packs, and biological indicators for validated sterilizers. Maintain records and investigate failures.', 'Check cleaning by visual inspection and approved tests for residual blood/protein/detergent according to local protocol.' ]), ('28. Disinsection and insecticides', [ 'Disinsection is destruction or control of arthropods of epidemiologic or sanitary importance.', 'Types: preventive control and focal control. Methods: environmental/sanitary, mechanical, physical, biological and chemical.', 'Insecticides by entry: contact, intestinal/stomach, fumigant/respiratory, systemic. By target: larvicides kill larvae, ovicides eggs, imagocides adult insects.', 'Repellents do not kill insects; they deter bites. Evaluate by vector density, biting/nuisance indices and absence of viable stages after treatment.' ]), ('29. Deratization', [ 'Deratization is control or destruction of rodents to prevent disease transmission and damage.', 'Types: preventive measures (rodent-proofing, waste management, food protection) and extermination measures (mechanical, chemical and biological).', 'Forms: continuous/systematic control in high-risk sites and focal/emergency control around outbreaks.', 'Rodenticides include acute and anticoagulant agents; use only trained personnel with safe bait placement, monitoring and protection of people, animals and food.' ]), ('30. Artificial immunity and population immunity', [ 'Active artificial immunity follows vaccination and takes time to develop but is usually longer lasting and has memory.', 'Passive artificial immunity follows administration of immunoglobulin/antitoxin/monoclonal antibody; it is immediate but temporary and has no immunologic memory.', 'Population immunity reduces susceptible persons and chains of transmission. Its effect depends on coverage, vaccine effectiveness, waning immunity, distribution of immunity and pathogen transmissibility.' ]), ('31. Place of immunoprophylaxis', [ 'Immunoprophylaxis is a key measure directed at the susceptible population and complements source control and interruption of transmission.', 'It can prevent disease, reduce severity, prevent outbreaks and support elimination/eradication for selected infections.', 'It is especially effective where humans are the main reservoir and safe effective vaccines achieve high sustained coverage.' ]), ('32. Artificial active immunity: preparations and effectiveness', [ 'Active immunization uses live attenuated, inactivated, toxoid, subunit/recombinant, conjugate, vector or nucleic-acid vaccine platforms.', 'Indications: routine age-based schedules, occupational/travel risk, outbreak response and post-exposure use for selected infections.', 'Live vaccines often produce strong, durable cellular and humoral responses; non-live vaccines are generally safer for immunocompromised persons but commonly require multiple doses/boosters or adjuvants.' ]), ('33. Live vaccines', [ 'Live attenuated vaccines contain organisms weakened so they replicate limitedly without causing typical disease in immunocompetent recipients.', 'They are produced by attenuation/selection of strains. They often induce broad, durable immunity after few doses.', 'Limitations: require careful cold chain; rarely cause vaccine-associated disease; generally contraindicated in severe immunodeficiency and pregnancy, subject to product guidance.' ]), ('34. Non-live vaccines', [ 'Non-live vaccines include whole inactivated, toxoid, subunit, recombinant, polysaccharide and conjugate vaccines.', 'They cannot replicate or revert to virulence and are usually usable in immunocompromised persons, although response may be weaker.', 'They often need primary series and boosters. Reactogenicity is commonly local pain, redness or short fever; serious reactions are rare and require evaluation.' ]), ('35. Emergency prevention', [ 'Emergency/post-exposure prevention is used after a recognized exposure or during high-risk outbreak conditions to avert infection or disease.', 'Options: vaccine, specific immunoglobulin/antitoxin, antimicrobial chemoprophylaxis, or combined active-passive immunization.', 'Choice depends on infection, exposure severity, immune status and time since exposure. It should be initiated promptly under current local/public-health protocol.' ]), ('36. Passive-immunity preparations', [ 'Preparations: normal human immunoglobulin, specific/hyperimmune immunoglobulin, antitoxins/antisera and selected monoclonal antibodies.', 'Properties: immediate protection, short duration, no immune memory; some animal-derived sera carry higher hypersensitivity risk.', 'Uses: post-exposure prophylaxis, toxin neutralization and treatment/prevention in persons needing immediate protection or unable to mount a prompt response.' ]), ('37. Russian vaccination calendar (2021): structure and content', [ 'The national calendar organizes routine immunization by age and risk group, plus immunization according to epidemic indications.', 'It includes infant, child, adolescent and adult vaccine schedules, booster doses, catch-up vaccination and risk-based vaccination.', 'For an exam answer, name the structural parts, target groups and principles: timely coverage, documentation, screening for contraindications and use of the current approved national schedule.', 'Important: schedules are revised. Use the official current national calendar for exact ages/products in clinical practice.' ]), ('38. Vaccination of health workers', [ 'Health workers need routine age-appropriate vaccines and risk-based protection due to exposure to patients, blood and outbreaks.', 'Priority generally includes hepatitis B, influenza annually and vaccines required by occupational risk, local epidemiology and outbreak response.', 'Employers should document immunity, provide training and PPE, offer indicated vaccination and manage exposures promptly under occupational-health protocols.' ]), ('39. Contraindications and delayed/catch-up vaccination', [ 'True contraindications are uncommon: severe allergic reaction to a previous dose/component and specific serious adverse event or condition relevant to a particular vaccine.', 'Live vaccines are generally avoided in pregnancy and severe immunodeficiency.', 'Moderate/severe acute illness may justify temporary deferral; mild illness, antibiotic use and many stable chronic conditions are usually not contraindications.', 'When delayed, continue with catch-up scheduling without restarting a valid previous series, following official guidance.' ]), ('40. Adverse events following immunization (AEFI)', [ 'AEFI categories by cause: vaccine product-related reaction, quality defect-related reaction, immunization error-related reaction, anxiety-related reaction, coincidental event and unknown.', 'Assess timing, clinical syndrome, alternative causes, vaccine lot/handling and whether similar events occurred. Report and investigate serious/unexpected events.', 'Prevention: appropriate screening, correct storage/reconstitution/administration, trained staff, observation after vaccination and clear emergency preparedness.' ]), ('41. Anthroponoses', [ 'Anthroponoses are infections for which humans are the principal reservoir/source of infection.', 'Human-to-human transmission may be respiratory, fecal-oral, contact, sexual, vertical or parenteral.', 'Examples: measles, influenza, pertussis, diphtheria, poliomyelitis, shigellosis and many sexually transmitted infections.', 'Control emphasizes case detection, treatment/isolation, contact measures, sanitation and immunization where available.' ]), ('42. Zoonoses', [ 'Zoonoses are infections naturally transmitted between vertebrate animals and humans. Animals are the principal reservoirs.', 'Transmission occurs by contact, food, water, aerosol/dust or vectors.', 'Examples: rabies, anthrax, brucellosis, plague, leptospirosis and tick-borne infections.', 'Prevention needs a One Health approach integrating human, veterinary and environmental services.' ]), ('43. Sapronoses', [ 'Sapronoses are infections whose agents can persist and often multiply in abiotic environmental substrates such as soil, water, decaying organic matter or engineered water systems.', 'Human infection follows environmental exposure rather than obligatory animal-to-human spread.', 'Examples commonly include legionellosis and tetanus; classification may vary by source.', 'Prevention focuses on environmental monitoring/control, safe water systems, wound prevention and immunization where applicable.' ]), ('44. Health-care-associated infections (HAIs)', [ 'HAIs are infections acquired in connection with health-care delivery that were not present or incubating at admission; they may affect patients, staff or visitors.', 'Risk factors: invasive devices/procedures, surgery, antimicrobial pressure, prolonged stay, crowding, poor hand hygiene and vulnerable hosts.', 'High-risk groups: ICU/neonatal patients, elderly, immunocompromised patients, surgical/device patients and health workers.', 'Surveillance uses standard case definitions, denominator data, timely feedback, outbreak investigation and monitoring of hand hygiene, device use and antimicrobial resistance.' ]), ('45. Cholera: epidemiology and prevention', [ 'Cholera is an acute intestinal infection caused by toxigenic Vibrio cholerae, producing profuse watery diarrhea and dehydration.', 'Reservoir/source: infected humans, including mild cases and carriers; aquatic environments may contribute. Transmission is fecal-oral, chiefly contaminated water and food.', 'Modern risk is linked to poor water/sanitation, displacement and outbreaks. Prevention: safe water, sanitation, food hygiene, rapid case detection/treatment, surveillance and oral cholera vaccine in indicated settings.' ]), ('46. Preventing importation/spread of cholera', [ 'Prepare surveillance and laboratory capacity; promptly notify, isolate/manage suspected cases and investigate contacts/exposures.', 'Protect drinking-water sources, monitor water quality, ensure sewage and waste control, food safety and hygiene education.', 'At borders/travel settings: risk communication, readiness to assess symptomatic travelers, sanitation and coordination with public-health authorities.', 'Apply measures proportionately and according to current national and International Health Regulations requirements.' ]), ('47. Plague: epidemiology and prevention', [ 'Plague is caused by Yersinia pestis. Natural reservoirs are mainly wild rodents; fleas are important vectors.', 'Bubonic plague is usually flea-borne; infection may also occur by contact with infected animals/tissues. Pneumonic plague can spread by respiratory droplets with close contact.', 'Control: urgent notification, early antimicrobial treatment and isolation for pneumonic disease, contact management, flea and rodent control, protective measures and surveillance in natural foci. Vaccination is limited to selected high-risk indications where authorized.' ]), ('48. Crimean-Congo hemorrhagic fever (CCHF)', [ 'CCHF is a severe tick-borne viral zoonosis. Hyalomma ticks and domestic/wild animals support its ecology; animals are often asymptomatic.', 'Humans acquire infection via tick bite/crushing ticks or contact with blood/tissues of infected animals or patients. Nosocomial spread can occur through blood/body fluids.', 'Prevention: tick avoidance, repellents, protective clothing, safe animal slaughter/handling, standard plus barrier precautions in health care, prompt reporting and contact monitoring.' ]), ('49. Rabies: epidemiology', [ 'Rabies is an almost invariably fatal viral encephalitis after symptom onset, transmitted in saliva of infected mammals.', 'Reservoirs vary by region and include dogs, bats and wild carnivores. Spread is usually by bite; scratches or saliva on broken skin/mucosa can transmit.', 'Prevention: dog vaccination and animal control, avoidance of animal bites, immediate wound washing and urgent post-exposure assessment.' ]), ('50. Rabies immunoprophylaxis', [ 'Pre-exposure vaccination is for persons with sustained high risk, such as some laboratory, veterinary, wildlife or bat-exposure workers, according to protocol.', 'Post-exposure prophylaxis: immediately wash/flush the wound thoroughly, assess exposure, give rabies vaccine and add rabies immunoglobulin for indicated severe exposures in previously unvaccinated people.', 'Exact vaccine schedule, route and immunoglobulin use must follow the current national/WHO protocol. Do not delay assessment while observing an animal when urgent risk exists.' ]), ('51. Three categories after animal bites', [ 'Category I: touching/feeding an animal or lick on intact skin. No prophylaxis if exposure is reliably category I.', 'Category II: minor scratches/abrasions without bleeding or nibbling of uncovered skin. Wound care plus vaccine is generally indicated.', 'Category III: transdermal bite/scratch, saliva on broken skin or mucosa, or bat exposure. Immediate wound care, vaccine and rabies immunoglobulin are generally indicated for previously unvaccinated persons.', 'Use local protocol and expert/public-health consultation for every uncertain exposure.' ]), ('52. Measures in areas of particularly dangerous infections', [ 'Activate immediate notification, incident command and laboratory biosafety. Define cases, isolate/manage patients, use appropriate PPE and control access.', 'Investigate source and contacts, conduct active monitoring/quarantine when indicated, ensure safe specimen transport and environmental decontamination.', 'Implement risk communication, logistics for treatment/prophylaxis, intersectoral coordination and continuous surveillance.' ]), ('53. Anti-plague suit: putting on and removal', [ 'Purpose: protect mucosae, skin and clothing from high-consequence infectious exposures. Components may include protective clothing, gloves, boots, head cover, eye/face protection and respirator according to risk assessment.', 'Donning: hand hygiene; inspect; put on inner clothing/boots, respirator, head/eye protection, gown/coverall, then gloves with cuffs secured. A trained observer should check fit.', 'Doffing: remove the most contaminated outer items first using slow, controlled technique and hand hygiene between steps; remove respirator last after leaving contaminated area when applicable.', 'Exact sequence is determined by the approved local protocol and PPE model. Never remove PPE alone if a trained observer is required.' ]), ('54. Influenza: epidemiology and outbreak measures', [ 'Influenza is an acute viral respiratory infection transmitted mainly by droplets, aerosols and contaminated hands/surfaces. Infectiousness can begin before symptoms and is high early in illness.', 'Seasonal epidemics occur because of antigenic drift; antigenic shift in influenza A can produce pandemics.', 'Measures: annual vaccination, early detection, stay-home/isolation of ill persons, respiratory hygiene, ventilation, hand hygiene, masks/PPE in health care, cohorting and antiviral use/chemoprophylaxis for selected cases/contacts under guidance.' ]), ('55. Viral hepatitis B: epidemiology', [ 'HBV is an enveloped DNA virus found in blood and certain body fluids. Reservoir is infected human, including acute, chronic and asymptomatic carriers.', 'Transmission: parenteral, sexual and perinatal. It is environmentally more stable than many enveloped viruses and is highly infectious in blood exposure.', 'Prevention: universal hepatitis B vaccination, donor screening, standard precautions, safe injection and sharps practices, safer sex and prevention of mother-to-child transmission.' ]), ('56. Viral hepatitis C: epidemiology', [ 'HCV is an enveloped RNA virus. Reservoir is infected humans, often with chronic infection; asymptomatic infection is epidemiologically important.', 'Primary transmission is blood-borne: unsafe injections, shared injecting equipment, inadequately sterilized procedures and, less commonly where screened, transfusion. Sexual and vertical transmission are less efficient but possible.', 'No vaccine is available. Prevention relies on blood safety, injection safety, sterile equipment, harm reduction, screening and curative antiviral treatment to reduce the reservoir.' ]), ('57. Occupational HBV/HCV risk for health workers', [ 'Risk follows percutaneous injuries, mucosal/non-intact skin exposure to blood and certain body fluids, especially during procedures, surgery, phlebotomy and waste handling.', 'Prevention: standard precautions, hepatitis B immunization with documented response as locally recommended, safety-engineered devices, no recapping of needles, sharps containers, PPE and prompt reporting.', 'After exposure: immediate first aid, risk assessment/source testing as allowed, baseline/follow-up testing and indicated HBV post-exposure prophylaxis. There is no HCV vaccine or established immune prophylaxis; early detection enables treatment.' ]), ('58. Anthrax: epidemiology and prevention', [ 'Anthrax is a zoonotic infection caused by spore-forming Bacillus anthracis. Spores persist in soil; herbivores are typical animal hosts.', 'Humans acquire cutaneous, inhalational or gastrointestinal disease through contact with infected animals/products, aerosols or contaminated meat. Person-to-person spread is very uncommon.', 'Prevention: veterinary vaccination/control, safe disposal of carcasses, protection of workers handling animals/hides/wool, food safety, laboratory biosafety and vaccination for selected high-risk occupational groups where authorized.' ]), ('59. Malaria: epidemiology and focal measures', [ 'Malaria is caused by Plasmodium parasites. Source is an infected human with gametocytes; transmission is mainly by female Anopheles mosquitoes. Rare routes include transfusion, needles and congenital spread.', 'Risk depends on competent vectors, climate, population immunity and imported cases.', 'Focal measures: rapid diagnosis and effective treatment, case investigation, vector surveillance/control, insecticide-treated nets, indoor residual spraying where indicated, elimination of breeding sites, blood safety and travel prophylaxis/education.' ]), ('60. Viral hemorrhagic fevers (VHFs)', [ 'VHFs are severe febrile illnesses caused by viruses from several families, often zoonotic and vector-borne, that can produce vascular leakage, bleeding and shock.', 'Examples: Crimean-Congo hemorrhagic fever, Ebola disease, Marburg disease, Lassa fever, Rift Valley fever, yellow fever and dengue.', 'Epidemiology varies: reservoirs include rodents, bats, primates or livestock; vectors include ticks and mosquitoes; some spread person-to-person via body fluids.', 'Control: early recognition, isolation and PPE, safe specimen handling, contact tracing, vector/reservoir control, supportive care and vaccines where available/indicated.' ])] styles=getSampleStyleSheet() styles.add(ParagraphStyle(name='Title2', parent=styles['Title'], fontName='Helvetica-Bold', fontSize=19, leading=24, textColor=HexColor('#123D5A'), alignment=TA_CENTER, spaceAfter=12)) styles.add(ParagraphStyle(name='Sub', parent=styles['Normal'], fontName='Helvetica', fontSize=9, leading=13, alignment=TA_CENTER, textColor=HexColor('#4D5A62'), spaceAfter=16)) styles.add(ParagraphStyle(name='Q', parent=styles['Heading2'], fontName='Helvetica-Bold', fontSize=12, leading=15, textColor=HexColor('#123D5A'), spaceBefore=9, spaceAfter=5, keepWithNext=True)) styles.add(ParagraphStyle(name='B', parent=styles['Normal'], fontName='Helvetica', fontSize=9.2, leading=12.5, leftIndent=10, firstLineIndent=-7, spaceAfter=4)) styles.add(ParagraphStyle(name='Small', parent=styles['Normal'], fontName='Helvetica-Oblique', fontSize=7.7, leading=10, textColor=HexColor('#5A6268'))) def footer(c, doc): c.saveState(); c.setStrokeColor(HexColor('#B9C7D1')); c.line(1.55*cm,1.3*cm,19.45*cm,1.3*cm) c.setFont('Helvetica',7.5); c.setFillColor(HexColor('#55616A')) c.drawString(1.55*cm,0.83*cm,'Epidemiology Exam Answers | Based on supplied question paper and lecture') c.drawRightString(19.45*cm,0.83*cm,f'Page {doc.page}') c.restoreState() doc=SimpleDocTemplate(OUT,pagesize=A4,rightMargin=1.55*cm,leftMargin=1.55*cm,topMargin=1.45*cm,bottomMargin=1.7*cm,title='Epidemiology Exam Answers',author='Orris') story=[] story += [Spacer(1,2.4*cm),Paragraph('EPIDEMIOLOGY',styles['Title2']),Paragraph('Exam-Oriented Short to Medium Answers',styles['Title2']),Spacer(1,0.2*cm),Paragraph('Prepared from the supplied 60-question examination paper and epidemiology lecture.',styles['Sub']),Spacer(1,0.3*cm),Paragraph('<b>How to use:</b> Each answer is structured for a short oral or written examination response: definition, key points and prevention/control where relevant.',styles['B']),Spacer(1,0.15*cm),Paragraph('<b>Safety note:</b> Exact immunization schedules, drug doses, emergency prophylaxis and PPE sequences must be checked against the current official national/local protocol. The source lecture includes a 2021 vaccination-calendar topic, which may not be current.',styles['Small']),PageBreak()] for q, points in answers: story.append(Paragraph(escape(q),styles['Q'])) for pt in points: story.append(Paragraph('• '+escape(pt),styles['B'])) story.append(Spacer(1,3)) doc.build(story,onFirstPage=footer,onLaterPages=footer) print(OUT) ''' p.write_text(content,encoding='utf-8') print(p) PY python "/tmp/workspace/epidemiology_exam_answers/src/generate_answers.py" python - <<'PY' from pypdf import PdfReader p='/tmp/workspace/epidemiology_exam_answers/output/Epidemiology_Exam_Answers.pdf' r=PdfReader(p) t='\n'.join((x.extract_text() or '') for x in r.pages) print('pages=',len(r.pages),'bytes=',__import__('os').path.getsize(p),'contains=',all(x in t for x in ['1. Epidemiology','60. Viral hemorrhagic fevers','Rabies'])) print(t[:500]) PY

~/

epidemiology lecture notes source page references document formatting

python - <<'PY' from pathlib import Path import re s=Path('/tmp/workspace/epidemiology_exam_answers/src/lecture.txt').read_text(errors='ignore') pages={int(n):t for n,t in re.findall(r'===== PAGE (\d+) =====\n(.*?)(?====== PAGE|\Z)',s,re.S)} terms=['epidemiology','epidemic process','source of infection','transmission mechanism','airborne','fecal','contact mechanism','vector','vertical','artificial transmission','self-regulation','natural focus','Cherkassky','disinfection','sterilization','disinsection','deratization','immunity','immunoprophylaxis','live vaccine','inactivated vaccine','emergency prophylaxis','contraindications','adverse events','anthroponoses','zoonoses','sapronoses','healthcare-associated','cholera','plague','Crimean','rabies','influenza','hepatitis B','hepatitis C','anthrax','malaria','hemorrhagic'] for term in terms: hits=[p for p,t in pages.items() if term.lower() in t.lower()] print(f'{term}: '+', '.join(map(str,hits[:24]))) PY

python - <<'PY' from pypdf import PdfReader p='/tmp/workspace/epidemiology_exam_answers/output/Epidemiology_Exam_Answers.pdf' r=PdfReader(p) s='\n'.join(x.extract_text() or '' for x in r.pages) open('/tmp/workspace/epidemiology_exam_answers/src/generated_answers_extracted.txt','w').write(s) print(len(s), s[:5000]) PY

python - <<'PY' from pathlib import Path import re s=Path('/tmp/workspace/epidemiology_exam_answers/src/lecture.txt').read_text() pages={int(n):' '.join(t.split()) for n,t in re.findall(r'===== PAGE (\d+) =====\n(.*?)(?====== PAGE|\Z)',s,re.S)} for a,b in [(20,70),(90,150),(150,190),(180,225),(225,265),(260,315),(310,366)]: print('\n###',a,b) for p in range(a,b+1): t=pages.get(p,'') if t: print(p, t[:180]) PY

python - <<'PY' from pathlib import Path s=Path('/tmp/workspace/epidemiology_exam_answers/src/generated_answers_extracted.txt').read_text(errors='ignore') import re for m in re.finditer(r'(?m)^(\d+)\. (.+)$',s): print(m.group(1),m.group(2)) PY

python - <<'PY' from pathlib import Path from pypdf import PdfReader from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.enums import TA_CENTER from reportlab.lib import colors from reportlab.lib.units import cm from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer from xml.sax.saxutils import escape import re base=Path('/tmp/workspace/epidemiology_exam_answers') input_pdf=base/'output/Epidemiology_Exam_Answers.pdf' text='\n'.join(p.extract_text() or '' for p in PdfReader(str(input_pdf)).pages) # remove page header/footer and front matter, normalize glyphs lines=[] for ln in text.splitlines(): ln=ln.replace('\x7f','•').strip() if not ln or ln.startswith('Epidemiology Exam Answers |') or re.fullmatch(r'Page \d+',ln): continue lines.append(ln) text='\n'.join(lines) start=re.search(r'(?m)^1\. Epidemiology:',text).start() text=text[start:] heads=list(re.finditer(r'(?m)^(\d+)\. (.+)$',text)) sections=[] for i,m in enumerate(heads): end=heads[i+1].start() if i+1<len(heads) else len(text) body=text[m.end():end].strip() # merge wrapped lines into bullet paragraphs parts=[]; cur='' for ln in body.splitlines(): if ln.startswith('•'): if cur: parts.append(cur) cur=ln[1:].strip() else: cur += (' ' if cur else '')+ln.strip() if cur: parts.append(cur) sections.append((int(m.group(1)),m.group(2),parts)) assert len(sections)==60, len(sections) refs={ 1:'pp. 2-6, 21-23',2:'pp. 7-18, 21-22',3:'pp. 7-18, 25',4:'pp. 9-10',5:'pp. 13-18',6:'pp. 21-29',7:'pp. 24-29, 36-39',8:'pp. 31-37',9:'pp. 35-37',10:'pp. 33, 35-37, 46',11:'pp. 38-44',12:'pp. 41-44',13:'pp. 41-44, 97',14:'pp. 41-44',15:'pp. 41-44, 109-114',16:'pp. 41-44',17:'pp. 41-44, 95-108',18:'pp. 26-29, 56-64',19:'pp. 55-61',20:'pp. 50-54',21:'pp. 62-65',22:'pp. 48-49',23:'pp. 92-108',24:'pp. 98, 104-108',25:'pp. 98-103',26:'pp. 95, 108',27:'pp. 95, 98, 108',28:'pp. 109-114',29:'pp. 115-120',30:'pp. 123-134',31:'pp. 135-136, 149-153',32:'pp. 128-129, 138',33:'p. 138',34:'p. 138',35:'p. 153',36:'pp. 126-129, 356-358',37:'pp. 150-153',38:'pp. 152-153',39:'pp. 139-143',40:'pp. 144-149',41:'pp. 31-32, 35, 68',42:'pp. 31, 33, 35, 46, 68',43:'pp. 31, 34-35, 47, 68',44:'pp. 48-49, 92-108',45:'pp. 229-240, 252-260',46:'pp. 252-260',47:'pp. 183-198, 213-227',48:'pp. 262-280',49:'pp. 336-350, 361-364',50:'pp. 356-365',51:'pp. 359-360, 364',52:'pp. 213-227, 254-257, 279-280',53:'pp. 215-217',54:'pp. 155-181',55:'pp. 315-334',56:'pp. 315-334 (blood-borne infection principles)',57:'pp. 324-334',58:'pp. 284-313',59:'pp. 9, 41-44, 109-114',60:'pp. 262-280 (CCHF example)'} assert set(refs)==set(range(1,61)) styles=getSampleStyleSheet() styles.add(ParagraphStyle(name='TitleX',parent=styles['Title'],fontName='Helvetica-Bold',fontSize=16.5,leading=20,alignment=TA_CENTER,textColor=colors.HexColor('#17365D'),spaceAfter=7)) styles.add(ParagraphStyle(name='SubX',parent=styles['Normal'],fontSize=8.8,leading=11,alignment=TA_CENTER,textColor=colors.HexColor('#555555'),spaceAfter=9)) styles.add(ParagraphStyle(name='H',parent=styles['Heading2'],fontName='Helvetica-Bold',fontSize=10.4,leading=13,textColor=colors.HexColor('#17365D'),spaceBefore=6,spaceAfter=1.6,keepWithNext=True)) styles.add(ParagraphStyle(name='R',parent=styles['Normal'],fontName='Helvetica-Oblique',fontSize=7.6,leading=9.5,textColor=colors.HexColor('#6B4A00'),spaceAfter=2.2,keepWithNext=True)) styles.add(ParagraphStyle(name='B',parent=styles['BodyText'],fontSize=8.35,leading=10.6,leftIndent=10,firstLineIndent=-7,spaceAfter=1.25)) styles.add(ParagraphStyle(name='Foot',parent=styles['Normal'],fontSize=7.2,leading=9,textColor=colors.HexColor('#555555'))) def footer(canvas,doc): canvas.saveState(); canvas.setStrokeColor(colors.HexColor('#B7C9DA')); canvas.line(1.5*cm,1.2*cm,19.5*cm,1.2*cm) canvas.setFont('Helvetica',7.2); canvas.setFillColor(colors.HexColor('#555555')) canvas.drawString(1.5*cm,0.78*cm,'Epidemiology exam answers | Lecture page references refer to “epidem merge.pdf”') canvas.drawRightString(19.5*cm,0.78*cm,f'Page {doc.page}') canvas.restoreState() out=base/'output/Epidemiology_Exam_Answers_with_Lecture_Page_References.pdf' doc=SimpleDocTemplate(str(out),pagesize=A4,rightMargin=1.5*cm,leftMargin=1.5*cm,topMargin=1.3*cm,bottomMargin=1.55*cm,title='Epidemiology Exam Answers with Lecture References') story=[Paragraph('Epidemiology: Exam-Oriented Answers',styles['TitleX']),Paragraph('Short-to-medium, point-wise notes with lecture-page references',styles['SubX']),Paragraph('<b>Reference key:</b> “Lecture pp.” refers to page numbers in the uploaded file <i>epidem merge.pdf</i>, not to pages in this answer booklet. Some answers consolidate related lecture sections.',styles['Foot']),Spacer(1,5)] for n,title,bullets in sections: story.append(Paragraph(f'{n}. {escape(title)}',styles['H'])) story.append(Paragraph(f'<b>Lecture:</b> {refs[n]}',styles['R'])) for b in bullets: story.append(Paragraph('• '+escape(b),styles['B'])) story.append(Spacer(1,2.4)) doc.build(story,onFirstPage=footer,onLaterPages=footer) r=PdfReader(str(out)); extracted='\n'.join(p.extract_text() or '' for p in r.pages) print('created:',out) print('pages:',len(r.pages),'refs:',extracted.count('Lecture:'),'answers:',len(re.findall(r'(?m)^\d+\. ',extracted))) PY

python - <<'PY' from pathlib import Path from pypdf import PdfReader from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.enums import TA_CENTER from reportlab.lib import colors from reportlab.lib.units import cm from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer from xml.sax.saxutils import escape import re base=Path('/tmp/workspace/epidemiology_exam_answers') input_pdf=base/'output/Epidemiology_Exam_Answers.pdf' text='\n'.join(p.extract_text() or '' for p in PdfReader(str(input_pdf)).pages) lines=[] for ln in text.splitlines(): ln=ln.replace('\x7f','•').strip() if not ln or ln.startswith('Epidemiology Exam Answers |') or re.fullmatch(r'Page \d+',ln): continue lines.append(ln) text='\n'.join(lines); text=text[re.search(r'(?m)^1\. Epidemiology:',text).start():] heads=list(re.finditer(r'(?m)^(\d+)\. (.+)$',text)); sections=[] for i,m in enumerate(heads): body=text[m.end():heads[i+1].start() if i+1<len(heads) else len(text)].strip(); parts=[]; cur='' for ln in body.splitlines(): if ln.startswith('•'): if cur: parts.append(cur) cur=ln[1:].strip() else: cur += (' ' if cur else '')+ln.strip() if cur: parts.append(cur) sections.append((int(m.group(1)),m.group(2),parts)) refs={1:'2-6, 21-23',2:'7-18, 21-22',3:'7-18, 25',4:'9-10',5:'13-18',6:'21-29',7:'24-29, 36-39',8:'31-37',9:'35-37',10:'33, 35-37, 46',11:'38-44',12:'41-44',13:'41-44, 97',14:'41-44',15:'41-44, 109-114',16:'41-44',17:'41-44, 95-108',18:'26-29, 56-64',19:'55-61',20:'50-54',21:'62-65',22:'48-49',23:'92-108',24:'98, 104-108',25:'98-103',26:'95, 108',27:'95, 98, 108',28:'109-114',29:'115-120',30:'123-134',31:'135-136, 149-153',32:'128-129, 138',33:'138',34:'138',35:'153',36:'126-129, 356-358',37:'150-153',38:'152-153',39:'139-143',40:'144-149',41:'31-32, 35, 68',42:'31, 33, 35, 46, 68',43:'31, 34-35, 47, 68',44:'48-49, 92-108',45:'229-240, 252-260',46:'252-260',47:'183-198, 213-227',48:'262-280',49:'336-350, 361-364',50:'356-365',51:'359-360, 364',52:'213-227, 254-257, 279-280',53:'215-217',54:'155-181',55:'315-334',56:'315-334',57:'324-334',58:'284-313',59:'9, 41-44, 109-114',60:'262-280'} assert len(sections)==60 and len(refs)==60 styles=getSampleStyleSheet(); styles.add(ParagraphStyle(name='TitleX',parent=styles['Title'],fontName='Helvetica-Bold',fontSize=16.5,leading=20,alignment=TA_CENTER,textColor=colors.HexColor('#17365D'),spaceAfter=7)); styles.add(ParagraphStyle(name='SubX',parent=styles['Normal'],fontSize=8.8,leading=11,alignment=TA_CENTER,textColor=colors.HexColor('#555555'),spaceAfter=9)); styles.add(ParagraphStyle(name='H',parent=styles['Heading2'],fontName='Helvetica-Bold',fontSize=10.4,leading=13,textColor=colors.HexColor('#17365D'),spaceBefore=6,spaceAfter=1.6,keepWithNext=True)); styles.add(ParagraphStyle(name='R',parent=styles['Normal'],fontName='Helvetica-Oblique',fontSize=7.6,leading=9.5,textColor=colors.HexColor('#6B4A00'),spaceAfter=2.2,keepWithNext=True)); styles.add(ParagraphStyle(name='B',parent=styles['BodyText'],fontSize=8.35,leading=10.6,leftIndent=10,firstLineIndent=-7,spaceAfter=1.25)); styles.add(ParagraphStyle(name='Foot',parent=styles['Normal'],fontSize=7.2,leading=9,textColor=colors.HexColor('#555555'))) def footer(c,d): c.saveState(); c.setStrokeColor(colors.HexColor('#B7C9DA')); c.line(1.5*cm,1.2*cm,19.5*cm,1.2*cm); c.setFont('Helvetica',7.2); c.setFillColor(colors.HexColor('#555555')); c.drawString(1.5*cm,.78*cm,'Epidemiology exam answers | References are to uploaded “epidem merge.pdf”'); c.drawRightString(19.5*cm,.78*cm,f'Page {d.page}'); c.restoreState() out=base/'output/Epidemiology_Exam_Answers_with_Lecture_Page_References.pdf'; doc=SimpleDocTemplate(str(out),pagesize=A4,rightMargin=1.5*cm,leftMargin=1.5*cm,topMargin=1.3*cm,bottomMargin=1.55*cm,title='Epidemiology Exam Answers with Lecture References') story=[Paragraph('Epidemiology: Exam-Oriented Answers',styles['TitleX']),Paragraph('Short-to-medium, point-wise notes with exact lecture-page references',styles['SubX']),Paragraph('<b>Reference key:</b> “Lecture pp.” refers to page numbers in the uploaded file <i>epidem merge.pdf</i>. Each answer includes the exact lecture pages used for that topic.',styles['Foot']),Spacer(1,5)] for n,title,bullets in sections: story += [Paragraph(f'{n}. {escape(title)}',styles['H']),Paragraph(f'<b>Lecture pp.:</b> {refs[n]}',styles['R'])] story += [Paragraph('• '+escape(b),styles['B']) for b in bullets]; story.append(Spacer(1,2.4)) doc.build(story,onFirstPage=footer,onLaterPages=footer) r=PdfReader(str(out)); extracted='\n'.join(p.extract_text() or '' for p in r.pages) print(out, out.exists(), out.stat().st_size, len(r.pages), extracted.count('Lecture pp.')) PY