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Give the answer to the question in picture Refer park For 8 marks Appropriate diagrams necessary

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Adverse Events Following Immunization (AEFI)

Source: Park's Textbook of Preventive and Social Medicine

Definition

An AEFI is any untoward medical occurrence which follows immunization and which does not necessarily have a causal relationship with the usage of the vaccine. The adverse event may be any unfavourable or unintended sign, abnormal laboratory finding, symptom or disease.

Reported AEFIs can be:

True adverse events - genuinely a result of the vaccine or immunization process
Coincidental events - not due to the vaccine but temporally associated with immunization

Cause-Specific Classification (CIOMS/WHO 2012)

Type of AEFI	Definition
Vaccine product-related reaction	Caused by inherent properties of the vaccine product itself
Vaccine quality defect-related reaction	Caused by a quality defect in the vaccine product or its administration device
Immunization error-related reaction (formerly "programme error")	Caused by inappropriate vaccine handling, prescribing or administration - preventable
Immunization anxiety-related reaction (stress-related response)	Arising from anxiety about the immunization
Coincidental event	Caused by something other than the vaccine, immunization error, or anxiety

1. Vaccine Reactions

A. Common Minor Reactions

These arise as part of the immune response to the vaccine. They are expected, self-limiting, and do not indicate harm.

Local reactions (pain, swelling, redness at injection site):

Occur in ~10% of vaccinees
Up to 50% with DTP (whole cell) or tetanus boosters
BCG causes a papule 2+ weeks after, which ulcerates and heals leaving a scar

Systemic reactions (fever, malaise, irritability):

Fever in ~10% of vaccinees; ~50% with DTP
Measles/MMR: fever, rash, conjunctivitis in 5-15%
OPV: diarrhoea, headache, muscle pain in <1%
Mumps (swollen parotid) and rubella (joint pains) in <1% of children; rubella in 15% of adults

B. Rare, Serious Reactions

Reaction	Vaccine	Timing
Anaphylaxis	Any vaccine	Within minutes
Febrile seizures	DTP, measles/MMR	0-2 days (DTP); 6-12 days (measles)
Encephalopathy	DTP, measles/MMR	0-2 days (DTP); 6-12 days (measles)
Vaccine-associated paralytic polio (VAPP)	OPV	4-30 days (recipient); 4-75 days (contact)
Thrombocytopenia	Measles/MMR	15-35 days
Intussusception	Rotavirus vaccine	Usually after first dose
Disseminated BCG infection	BCG	1-12 months
Lymphadenitis/Osteitis	BCG	1-12 months

Anaphylaxis vs Fainting - important distinction:

Feature	Fainting	Anaphylaxis
Skin	Pallor, cold clammy	Urticaria, erythema, lip swelling
Pulse	Bradycardia	Tachycardia
Respiration	Normal/shallow	Tachypnoea, wheezing, stridor
Supine position	Relieves symptoms	Does NOT relieve
GIT	Vomiting only	Vomiting + diarrhoea + cramps

Management of anaphylaxis: Adrenaline 1:1000 solution, 0.5 ml IM immediately for adults; repeat every 20 minutes if BP <100 mmHg systolic. Add chlorpheniramine maleate 10-20 mg IM. Observe patient for 30 minutes after any vaccine injection.

2. Immunization Error-Related Reactions

These are preventable reactions caused by errors in handling, prescribing or administering vaccines:

Error Type	Example	Reaction
Vaccine handling error	Exposure to excess heat/cold; use after expiry	Agglutination of excipients; loss of potency
Prescribing/non-adherence error	Failure to observe contraindication; wrong dose	Anaphylaxis, VAPP, systemic reactions
Administration error	Wrong diluent; non-sterile technique	Abscess, sepsis, failure to vaccinate

Previously, the most common error was infection (HIV, hepatitis B) from non-sterile injection; this has reduced significantly with auto-disabled (AD) syringes. Contaminated vaccine (often Staphylococcus aureus) causes illness within a few hours of administration.

3. Immunization Stress-Related Response

Previously called "immunization anxiety-related reaction." Individuals can react in anticipation of or as a result of any injection. This is a vasovagal (fainting) response and is managed by laying the patient flat.

Reportable AEFIs (Surveillance)

Time after immunization	Events to report
Within 24-48 hours	Anaphylaxis, anaphylactoid reaction, persistent screaming >3 hours, hypotonic-hyporesponsive episode (HHE), toxic shock syndrome
Within 7 days	Severe local reaction, sepsis, injection site abscess
Within 14 days	Seizures (including febrile), encephalopathy
Within 3 months	Acute flaccid paralysis (AFP)
Within 1-12 months (BCG)	Lymphadenitis, disseminated BCG, osteitis/osteomyelitis
No time limit	Death, hospitalization, disability, or any severe/unusual event thought to be related

Common minor reactions (local reactions, transient fever) do NOT need reporting.

Investigating AEFI Clusters

A cluster = two or more cases of the same adverse event related in time, place, or vaccine administration.

Flowchart for AEFI Cluster Investigation (Fig. 25, Park's):

The flowchart guides towards:

Programme error - if all cases from one facility
Vaccine product-related reaction - if all cases got same vaccine/lot, it is a known reaction, within expected rate, and no similar illness in unvaccinated
Immunization error or vaccine quality defect - if reaction rate is higher than expected
Coincidental event - if similar illness exists in unvaccinated people

Prevention of AEFI

Proper sterilization of syringes and needles
Proper selection of the subject and the vaccine product
Observe contraindications carefully
Measles and BCG vaccines reconstituted only with manufacturer's diluent; discard at end of each session
No other drugs should be stored beside vaccines in the immunization refrigerator
Training and close supervision of immunization workers
Use of Auto-Disabled (AD) syringes to prevent reuse
Maintain cold chain integrity
Have adrenaline ready at every immunization session

Summary Diagram - AEFI Classification:

AEFI
├── Vaccine product-related reaction
├── Vaccine quality defect-related reaction
├── Immunization error-related reaction (Preventable)
├── Immunization anxiety/stress-related response
└── Coincidental event

Park's Textbook of Preventive and Social Medicine, Chapter on Immunization - AEFI section (Table 35, Table 36, Table 38, Table 39, Fig. 25)

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I have enough content from Park's for all 12 questions. Let me now compile the complete answer:Here are all 12 answers based strictly on Park's Textbook of Preventive and Social Medicine (3-4 marks each):

SPM Short Answers - Park's Textbook

Q1. Define: Epidemic, Endemic, Pandemic, Sporadic

EPIDEMIC: Occurrence of a disease in a community or region clearly in excess of normal expectancy; the agents, susceptible host, and environment are involved. It implies a greater frequency than usual. (Examples: cholera, influenza outbreaks)

ENDEMIC: The constant presence of a disease or infectious agent within a given geographic area or population group; may also refer to the usual prevalence of a given disease within such area or group. (Examples: malaria in tropical areas, filariasis in certain regions)

PANDEMIC: A worldwide epidemic affecting an exceptionally high proportion of the global population. It crosses international boundaries. (Example: COVID-19, Spanish flu 1918, HIV/AIDS)

SPORADIC: A disease occurring irregularly, haphazardly from time to time, and generally infrequently. Cases occur at irregular intervals, without any clear geographic concentration. (Example: tetanus, rabies)

Disease occurrence spectrum:
Sporadic → Endemic → Epidemic → Pandemic
(rare/irregular) (constant) (excess) (worldwide)

Q2. Case Fatality Rate (CFR)

Definition: CFR represents the killing power of a disease. It is the ratio of deaths to cases:

$$\text{CFR} = \frac{\text{Total deaths due to a disease}}{\text{Total cases of the same disease}} \times 100$$

Key points:

No specific time interval is stated
Used mainly in acute infectious diseases (cholera, food poisoning, measles)
Limited use in chronic diseases (long, variable onset-to-death period)
CFR for the same disease varies across epidemics due to changes in agent, host, and environment
CFR is closely related to virulence of the organism

Examples:

Rabies: CFR ~100% (once symptoms appear)
Cholera: 25-50% (untreated); <1% (treated)
COVID-19: ~1-3% (varied by country/wave)
Leptospirosis (severe illness): 5-15%

Q3. Secondary Attack Rate (SAR)

Definition (Park's): "The number of exposed persons developing the disease within the range of the incubation period, following exposure to the primary case."

$$\text{SAR} = \frac{\text{No. of exposed persons developing disease within incubation period}}{\text{Total number of exposed/susceptible contacts}} \times 100$$

Important rules:

Primary case is excluded from both numerator and denominator
Denominator = susceptible contacts only (immune persons excluded if identifiable)

Example:

Family of 6: 2 parents (immune) + 4 susceptible children
1 primary case + 2 secondary cases among remaining 3 susceptible children
SAR = 2/3 = 66.6%

Uses:

Measures communicability of a disease
Compares vaccine efficacy (vaccinated vs unvaccinated)
Best used in diseases where primary case is infective for a short period (measles, chickenpox)

Q4. Nosocomial Infections & Control

Definition: Nosocomial (hospital-acquired) infection is an infection originating in a patient while in a hospital or healthcare facility. It denotes a new disorder unrelated to the patient's primary condition. It was not present or incubating at time of admission. It includes infections appearing after discharge and infections in hospital staff.

Examples: Surgical wound infection, hepatitis B, UTI

Sources: 1. Endogenous (patient's own flora) 2. Exogenous (other patients, staff, environment)

Common sites: Urinary tract > Surgical wounds > Respiratory tract > Blood stream

Control measures:

Hand hygiene - most important single measure
Isolation of infected patients
Proper sterilization and disinfection of instruments
Rational antibiotic use (prevent resistance)
Surveillance of infection rates
Training and education of hospital staff
Use of personal protective equipment (PPE)
Proper waste disposal
Auto-disabled syringes to prevent reuse
Aseptic technique in all procedures

Q5a. Opportunistic Infection

Definition (Park's): Infection with organism(s) that are normally innocuous (e.g. commensals in humans) but become pathogenic when the body's immunological defences are compromised, as in AIDS.

Key features:

Causative organisms: normally non-pathogenic (Candida, Pneumocystis jirovecii, CMV, Toxoplasma)
Occurs when: AIDS, immunosuppressive therapy, malnutrition, malignancy
Example: Pneumocystis carinii pneumonia (PCP) in AIDS patients

Q5b. Dead-End Infection

Definition (Park's): When an infectious agent has no portal of exit from the host, the infection becomes a dead-end infection. The parasite cannot reach a new host and propagate its species - the chain of transmission ends.

Examples: Rabies, bubonic plague, tetanus, trichinosis, Japanese encephalitis (man is incidental/dead-end host)

Significance: Dead-end infections do not contribute to disease transmission in the community.

Q6. Herd Immunity

Definition (Park's): "A type of immunity that occurs when the vaccination of a portion of the population (the herd) provides protection to unprotected individuals."

When a large number of a population are immune, it is difficult to maintain a chain of infection. The higher the immune proportion, the lower the likelihood a susceptible person contacts an infectious agent.

Elements contributing to herd immunity:

Clinical and subclinical infections in the herd
Immunization of the herd
Herd structure (affected by births, deaths, migration)

Herd Immunity Threshold (HIT): The proportion of immune individuals above which a disease may no longer persist. Varies with:

Virulence of disease
Efficacy of vaccine
Contact parameter (R0) of the population

Disease        HIT needed
Measles        ~92-95%
Polio          ~80-85%
Smallpox       ~83-85%
COVID-19       ~70-85%

Important notes:

100% herd immunity is NOT necessary to halt an epidemic
Herd immunity does NOT protect against tetanus (toxin-mediated, not person-to-person)
Determined by serological surveys

Q7. Carriers & Types of Carriers

Definition: A carrier is "a person (or animal) that harbours a specific infectious agent in the absence of discernible clinical disease and serves as a potential source of infection to others."

Types of Carriers:

Type	Description	Example
Incubatory carrier	Carries infection during incubation period before symptoms	Measles, hepatitis A
Convalescent carrier	Continues to shed pathogen during recovery	Typhoid, cholera
Healthy/Contact carrier	Harbours pathogen without any illness	Meningococcus, diphtheria
Intermittent carrier	Sheds organism at irregular intervals	Typhoid (Salmonella typhi)
Chronic carrier	Carries organism for >1 year (sometimes lifelong)	Typhoid (Typhoid Mary), Hepatitis B
Paradoxical carrier	Immune person who carries more virulent organism	--

Public health significance:

Carriers are more dangerous than clinical cases as they are unrecognised
Control: treatment, surveillance, restriction from food handling occupations

Q8. Isolation vs Quarantine

Feature	Isolation	Quarantine
Definition	Separation of infected persons from others	Restriction of activities of healthy persons exposed to a communicable disease
Applied to	Known ill/infected persons	Apparently healthy contacts/exposed persons
Duration	During period of communicability	For the maximum incubation period of the disease
Purpose	Prevent spread from sick to healthy	Prevent exposure from potentially incubating cases
Example	Isolating a TB patient	Quarantine of contacts of Ebola case
Legal basis	Can be compulsory	Can be compulsory under epidemic acts

Types of Isolation: 1. Strict isolation 2. Respiratory isolation 3. Enteric isolation 4. Wound/skin isolation 5. Discharge isolation 6. Blood/body fluid precautions

Types of Quarantine: 1. Absolute/complete quarantine 2. Modified quarantine 3. Personal surveillance 4. Segregation

Q9. Incubation Period, Latent Period, Communicable Period

Incubation Period

Definition: "The time interval between invasion by an infectious agent and appearance of the first sign or symptom of the disease."

Virus multiplies during this period
As a rule, diseases are NOT communicable during incubation (exceptions: measles, chickenpox, hepatitis A - communicable in late incubation)
Median incubation period = time for 50% of cases to occur after exposure

Duration	Examples
Short (hours-2 days)	Food poisoning, cholera, influenza
Medium (1-3 weeks)	Typhoid, measles, chickenpox, COVID-19
Long (weeks-months)	Hepatitis A & B, rabies, leprosy

Latent Period

Definition: The time from infection to becoming infectious (capable of transmitting to others). In some diseases the latent period is shorter than the incubation period (pathogen shed before symptoms = pre-symptomatic transmission).

Latent period < Incubation period → Pre-symptomatic spread (e.g., HIV, COVID-19)

Communicable Period

Definition (Park's): "The time during which an infectious agent may be transferred directly or indirectly from an infected person to another person."

Varies greatly between diseases
Some diseases are more communicable during incubation than actual illness
Early treatment reduces the communicable period
Key measure: Secondary Attack Rate (SAR)

INFECTION → LATENT PERIOD → INFECTIOUS
INFECTION → INCUBATION PERIOD → SYMPTOMS

Q10. Emporiatrics (Travellers' Health)

Definition (Park's): "Emporiatrics is the term coined to describe the science of the health of travellers."

Health risks to travellers:

Physical stresses: Crowding, long hours of waiting, disruption of eating habits, change in climate/time zone → nausea, fatigue, insomnia
Infectious disease exposure: Malaria, typhoid, hepatitis A, dengue, cholera, STDs, AIDS, giardiasis, filariasis - especially in developing countries
Separation from familiar medical care

Health advice to travellers:

Water & food: Use boiled/bottled water; avoid uncooked food, unpasteurized milk; food should be freshly and thoroughly cooked
Diarrhoea prevention: Affects 20-50% of travellers; oral rehydration salts (ORS) essential
Malaria: Chemoprophylaxis from day of arrival; continue 4-6 weeks after leaving endemic area
Insect bite prevention: Repellents, mosquito nets, protective clothing
Immunizations required: Yellow fever (mandatory for some countries), typhoid, hepatitis A, meningococcal meningitis, cholera
Hepatitis A: Normal human immunoglobulin 0.02-0.05 mg/kg every 4 months

Q11. Disinfection - Definition, Types + Sterilization

Disinfection: The process of destroying pathogenic organisms (but NOT necessarily spores) by physical or chemical means.

Types of Disinfection:

1. Concurrent Disinfection:

Immediate disinfection of all discharges and infective materials from a patient while still in hospital/home
Ongoing throughout illness
Example: disinfecting sputum of TB patient daily

2. Terminal Disinfection:

Disinfection of the patient's surroundings and belongings after patient has been removed (by recovery, death, or transfer)
Thorough cleaning and disinfection of the room, bed, linen, utensils

3. Prophylactic Disinfection:

Routine/ongoing disinfection to prevent infection (e.g. chlorination of water supply, pasteurization of milk)

Methods of Disinfection:

Chemical: Phenol, Lysol, chlorine, alcohol, formaldehyde, glutaraldehyde
Physical: Heat (boiling, steam), UV radiation, sunlight

Sterilization: Destruction of ALL micro-organisms including spores (absolute freedom from microbial life).

Methods of Sterilization:

Method	Details
Autoclaving (steam under pressure)	121°C for 15 min at 15 psi - gold standard
Dry heat oven (Hot air oven)	160°C for 1 hour
Boiling	100°C for 30 min (not for spores)
Gamma irradiation	Disposable medical items
Ethylene oxide gas	Heat-sensitive equipment
Filtration	For liquids (Seitz/Berkefelt filters)

Q12. Universal Immunization Programme (UIP)

Launched in India: 1985 (as part of the Technology Mission); expanded from Expanded Programme on Immunization (EPI, launched 1978)

Objective: To provide immunization to all infants and pregnant women throughout the country.

Vaccines under UIP:

Vaccine	Target	Schedule
BCG	Infants	At birth
OPV (Oral Polio)	Infants	0, 6, 10, 14 weeks + boosters
DPT/Pentavalent	Infants	6, 10, 14 weeks + booster
Hepatitis B	Infants	0, 6, 10, 14 weeks
IPV	Infants	6, 14 weeks
Measles/MR	Infants	9-12 months + 16-24 months
Vitamin A	Children	9 months onwards
TT/Td	Pregnant women	2 doses
Rotavirus vaccine	Infants	6, 10, 14 weeks (selected states)
PCV	Infants	6, 14 weeks + booster
JE vaccine	Children	Endemic districts

Goals of UIP:

Reduce morbidity and mortality from vaccine-preventable diseases
Achieve and sustain >90% immunization coverage
Eradication of polio, elimination of measles, neonatal tetanus

All answers: Park's Textbook of Preventive and Social Medicine

Add a note on aefi Causes Prevention

The previous session covered AEFI in detail. Here is a focused note on Causes and Prevention of AEFI from Park's:

AEFI - Causes & Prevention

Park's Textbook of Preventive and Social Medicine

DEFINITION (Recap)

An AEFI is any untoward medical occurrence which follows immunization and which does not necessarily have a causal relationship with the usage of the vaccine.

CAUSES OF AEFI

The CIOMS/WHO 2012 classification identifies 5 cause-specific categories:

1. Vaccine Product-Related Reaction

Caused by the inherent properties of the vaccine itself, even when correctly prepared and administered.

Adjuvants (aluminium salts) → local swelling, granuloma
Live attenuated vaccines → mild disease (e.g., measles vaccine → fever + rash in 5-15%)
Whole-cell pertussis → fever, inconsolable crying, febrile seizures
OPV → Vaccine-Associated Paralytic Polio (VAPP) - 1 per 2.4 million doses
BCG → local ulcer, keloid, rarely disseminated BCG disease
MMR → thrombocytopenia (15-35 days after), parotid swelling

2. Vaccine Quality Defect-Related Reaction

Caused by a manufacturing defect in the vaccine or its administration device.

Inadequate inactivation of virus/toxin (e.g., Cutter incident with polio vaccine - live virus not fully killed)
Contamination during production
Incorrect concentration of antigen
Faulty container/stopper
Now very rare due to Good Manufacturing Practices (GMP)

3. Immunization Error-Related Reaction (Programme Error)

Preventable reactions from incorrect handling, prescribing, or administration:

Error	Cause	Reaction
Storage error	Freezing freeze-sensitive vaccines (DPT, TT, HepB)	Increased local reactions due to agglutinated adjuvant
Heat exposure	Cold chain failure	Loss of potency; failure to immunize
Wrong diluent	Using incorrect diluent for reconstitution	Wrong concentration; toxic reaction
Wrong dose/site	Subcutaneous instead of intradermal for BCG	Abscess; no scar
Wrong recipient	Ignoring contraindications	Anaphylaxis; disseminated infection
Non-sterile technique	Reusing needles, multidose vial contamination	Abscess, sepsis, toxic shock syndrome, bloodborne virus transmission
Expired vaccine	Using vaccine after expiry date	Loss of potency or adverse reaction
Reconstituted vaccine kept too long	Not discarding at end of session	Bacterial contamination (Staphylococcus aureus) → illness within hours

4. Immunization Stress-Related Response (Anxiety-Related)

Psychological reactions in anticipation of or following injection:

Vasovagal syncope (fainting): Most common; pallor, cold sweat, bradycardia, brief loss of consciousness - relieved by lying flat
Hyperventilation and dizziness
Mass psychogenic illness: Multiple people in a group suddenly fall ill after immunization session (no biological cause)
More common in adolescents and adults than young children

5. Coincidental Event

Event that happens to occur after immunization but is caused by something entirely unrelated:

Fever from a concurrent infection (e.g., URTI, malaria) unrelated to the vaccine
Sudden Infant Death Syndrome (SIDS) - temporal association with DPT but NOT causally related
Febrile convulsion from intercurrent illness
These events would have occurred regardless of immunization

CAUSES - Summary Diagram

AEFI
│
├── Vaccine Product-Related → Inherent properties of vaccine
│   (even with correct use)
│
├── Vaccine Quality Defect → Manufacturing error
│   (very rare with GMP)
│
├── Immunization Error → PREVENTABLE
│   ├── Storage/transport error
│   ├── Wrong dose/site/route
│   ├── Wrong diluent
│   ├── Non-sterile technique
│   └── Ignoring contraindications
│
├── Stress-Related → Anxiety/vasovagal
│
└── Coincidental → Unrelated to vaccine

PREVENTION OF AEFI

A. Pre-Immunization Measures

Screen for contraindications before every dose:
- Severe allergy to vaccine components
- Previous severe AEFI to same vaccine
- Immunocompromised state (for live vaccines)
- Acute febrile illness (defer, do not skip)
Check the vaccine:
- Check expiry date
- Check VVM (Vaccine Vial Monitor) - discard if inner square darker than outer circle
- Shake test for freeze-sensitive vaccines
- Inspect for visible particles, color change
Check cold chain:
- Maintain +2°C to +8°C
- Never freeze DPT, TT, DT, HepB, Hib (freeze-sensitive vaccines)
- Use ice-lined refrigerators (ILR)
Use correct diluent:
- Only manufacturer-supplied diluent
- Pre-cool diluent for at least 24 hours before use to avoid thermal shock

B. During Immunization

Correct injection technique:
- Right site, right route, right angle
- BCG: intradermal (left deltoid)
- DPT: intramuscular (anterolateral thigh in infants)
- Avoid injecting into gluteal region (sciatic nerve injury)
Sterile technique:
- Use Auto-Disabled (AD) syringes - cannot be reused
- One needle + one syringe per child
- Do NOT recap needles
- Proper hand hygiene before immunization
Reconstituted vaccines:
- Reconstitute only with correct diluent
- Discard at end of immunization session (or within 6 hours of opening)
- Never store reconstituted vaccine
Multidose vials:
- Discard if contaminated, VVM shows discard, or >28 days after opening (WHO-prequalified with VVM on label)
Prepare for emergencies:
- Keep adrenaline 1:1000 ready at every immunization session
- Keep patient for 30 minutes after injection to observe for reactions
- Have antihistamines (chlorpheniramine) and IV fluids available

C. Post-Immunization

Counselling:
- Inform parents about expected minor reactions (fever, local soreness)
- Advise paracetamol for fever and pain
- Instruct when to return immediately (persistent crying >3 hours, high fever, convulsions, collapse)
Training of immunization staff:
- Regular training on correct techniques
- Supervision and quality checks
- Refresher training on AEFI recognition and management

D. Surveillance & Reporting

AEFI Surveillance system:
- Report all serious/unexpected AEFIs
- Investigate clusters promptly
- National AEFI Committee reviews serious cases
- Improves programme quality and public trust

MANAGEMENT OF ANAPHYLAXIS (Most serious AEFI)

Step	Action
Lay patient flat, raise legs	Immediate
Adrenaline 1:1000 - 0.5 ml IM (adult)	Immediately; repeat every 20 min if BP <100
Chlorpheniramine 10-20 mg IM	For urticaria/oedema
IV fluids if needed	For hypotension
Observe for minimum 30 min	After any vaccine

Key Prevention Message (Park's): "Training of immunization workers and their close supervision to ensure that proper procedures are being followed are essential to prevent complications and deaths following immunization."

Park's Textbook of Preventive and Social Medicine - AEFI Chapter

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