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RGUHS 2nd year MBBS microbiology exam important topics syllabus

Here is a comprehensive set of case-based questions for RGUHS 2nd Year MBBS Microbiology, covering all major exam topics across both papers:

RGUHS 2nd Year MBBS - Microbiology Case-Based Questions

PAPER 1 TOPICS

SECTION A: General Microbiology & Immunology

Case 1 - Bacterial Growth & Culture
A microbiology technician inoculates a specimen into blood agar and MacConkey agar. After 24 hours, she observes beta-hemolysis on blood agar and pink colonies on MacConkey agar.
  1. What does beta-hemolysis indicate?
  2. Why does MacConkey agar show pink colonies?
  3. Name four types of culture media with examples of each.
  4. What is the significance of enrichment media? Give two examples.
  5. Draw and explain the bacterial growth curve with all four phases.
Case 2 - Gram Staining
A patient presents with purulent discharge. The smear shows Gram-positive cocci in clusters.
  1. Describe the complete steps of Gram staining.
  2. Why do Gram-positive bacteria retain the crystal violet stain?
  3. What is the significance of iodine (mordant) in Gram staining?
  4. Name four Gram-positive cocci of clinical importance.
  5. What other stains are used in bacteriology? Name and describe the principle of Ziehl-Neelsen stain.
Case 3 - Sterilization & Disinfection
A surgical team is preparing for an operation. The surgeon asks the nurse about the methods to sterilize surgical instruments and the operation theatre.
  1. Define sterilization, disinfection, and antisepsis.
  2. What is the principle of autoclave? What temperature and pressure are used?
  3. What is the difference between moist heat and dry heat sterilization?
  4. What is the Spaulding classification for medical devices?
  5. Name two chemical agents used for sterilization and their mechanisms.
Case 4 - Antibiotic Sensitivity Testing
A wound swab is sent for culture and sensitivity. The lab report shows the organism is sensitive to amoxicillin but resistant to methicillin.
  1. Describe the Kirby-Bauer disc diffusion method.
  2. What is MIC (Minimum Inhibitory Concentration)?
  3. Explain the mechanism of methicillin resistance in Staphylococci (MRSA).
  4. What is the drug of choice for MRSA? Why?
  5. Define antibiotic resistance. Explain the mechanisms of resistance (4 types).
Case 5 - Immunology: Innate Immunity
A 25-year-old patient gets a splinter injury. Within hours, the area becomes red, hot, swollen, and painful.
  1. Name the four cardinal signs of inflammation and their mediators.
  2. What cells are the first to arrive at the site of infection?
  3. Describe the process of phagocytosis.
  4. What is the role of complement system in innate immunity? Name the three pathways.
  5. What are pattern recognition receptors (PRRs)? Give two examples.
Case 6 - Adaptive Immunity & Antibodies
A child receives a DPT vaccine. Two weeks later, blood tests show elevated IgG levels.
  1. What is the difference between active and passive immunity?
  2. Describe the structure of IgG antibody with a diagram.
  3. What is the primary and secondary immune response? Why is the secondary response faster?
  4. Name the five classes of immunoglobulins and their functions.
  5. What is the role of T-helper cells in antibody production?
Case 7 - Hypersensitivity Reactions
A patient develops urticaria, wheezing, and hypotension immediately after receiving penicillin injection.
  1. What type of hypersensitivity reaction is this? Name the antibody involved.
  2. Describe the mechanism of Type I hypersensitivity.
  3. What cells and mediators are responsible for this reaction?
  4. What is the immediate management of anaphylaxis?
  5. Name an example of each: Type II, Type III, and Type IV hypersensitivity.
Case 8 - Complement System
A child presents with recurrent pyogenic infections. Lab tests show absent C3 levels.
  1. What is the role of C3 in the complement cascade?
  2. Describe the classical pathway of complement activation.
  3. What is opsonization? Which complement component is the main opsonin?
  4. What are the consequences of complement deficiency?
  5. What is the membrane attack complex (MAC)?

SECTION B: CVS and Blood Infections

Case 9 - Infective Endocarditis
A 30-year-old IV drug user presents with fever, night sweats, and a new cardiac murmur. Blood cultures grow Gram-positive cocci in clusters.
  1. What is the most likely organism? How is it identified in the lab?
  2. Name the virulence factors of this organism.
  3. What are the blood culture requirements for diagnosing infective endocarditis (Duke's criteria)?
  4. Name the organisms commonly causing SBE vs acute bacterial endocarditis.
  5. What is the treatment of choice?
Case 10 - Malaria
A traveler returning from a forest area presents with high-grade fever with chills occurring every 48 hours, splenomegaly, and anemia.
  1. Which Plasmodium species causes tertian malaria? How does it differ from quartan malaria?
  2. Describe the life cycle of Plasmodium in the human host.
  3. What stain is used to identify malarial parasites in blood smears? What is the diagnostic finding?
  4. What is the rapid diagnostic test (RDT) for malaria? What antigen does it detect?
  5. What is blackwater fever? Which species causes it?
  6. Name the drug of choice for P. falciparum and P. vivax malaria.
Case 11 - Typhoid Fever
A 20-year-old student presents with stepladder fever for 10 days, headache, abdominal pain, relative bradycardia, and rose spots on the abdomen.
  1. Name the causative organism. What is its antigenic structure?
  2. What is the Widal test? What is its principle and interpretation?
  3. What is the gold standard for diagnosis of typhoid?
  4. Name the complications of typhoid fever.
  5. What is the drug of choice? What is the issue with chloramphenicol today?
Case 12 - HIV/AIDS
A 35-year-old male presents with recurrent oral candidiasis, weight loss, fever, and night sweats. His CD4 count is 180 cells/μL.
  1. Classify HIV. Describe its structure.
  2. What is the mechanism of HIV pathogenesis? How does it infect CD4 cells?
  3. What is the ELISA test used for HIV? When does it become positive (window period)?
  4. What are the WHO staging criteria for HIV/AIDS?
  5. What opportunistic infections are common when CD4 < 200/μL?
  6. What is HAART? Name the classes of antiretroviral drugs.
Case 13 - Blood Transfusion Infections
A patient who received a blood transfusion 6 months ago is now diagnosed with hepatitis B.
  1. Which viruses can be transmitted through blood transfusion?
  2. Describe the serology of hepatitis B. What is HBsAg, HBeAg, anti-HBc?
  3. What is the window period in HBV infection?
  4. How is HBV different from HCV in terms of transmission and chronicity?
  5. What mandatory tests are done before blood transfusion?

SECTION C: Gastrointestinal & Hepatobiliary Infections

Case 14 - Cholera
During a flood, several villagers develop profuse watery "rice-water" diarrhea, vomiting, and severe dehydration. Multiple cases occur in the same locality.
  1. Name the causative organism. Describe its morphology and culture characteristics.
  2. What is the mechanism of action of cholera toxin?
  3. What is the significance of El Tor biotype vs classical biotype?
  4. How is cholera confirmed in the lab?
  5. What is the treatment? Why are antibiotics secondary to rehydration?
  6. What is the TCBS medium?
Case 15 - Typhoid (GI aspect)
(See Case 11 above - additional GI focus questions)
A typhoid patient develops acute abdomen on Day 14.
  1. What complication has occurred? What is the pathogenesis?
  2. Which layer of the bowel is primarily involved in typhoid pathology?
  3. What is the role of Peyer's patches in typhoid infection?
Case 16 - Hepatitis A & E
A cluster of jaundice cases appears in a hostel after students ate food from a common canteen. All recover within 4-6 weeks without complications.
  1. Which hepatitis virus is most likely? How is it transmitted?
  2. What is the serological marker used to diagnose acute Hepatitis A?
  3. Compare Hepatitis A, B, C, D, and E in a table format (transmission, chronicity, vaccine availability).
  4. Which hepatitis virus is dangerous in pregnancy? Why?
  5. What is fulminant hepatitis?
Case 17 - Food Poisoning
Within 2 hours of eating a buffet lunch, 15 people develop vomiting without fever. No diarrhea.
  1. What is the most likely causative organism?
  2. What is the mechanism (toxin type)? Is it preformed or enterotoxin?
  3. Name five organisms causing food poisoning and their incubation periods.
  4. What is Botulism? How is it different from other food poisoning?
  5. What is the treatment of food poisoning?
Case 18 - Amoebic Dysentery
A 28-year-old presents with bloody mucoid diarrhea, tenesmus, and mild fever. Stool microscopy shows motile trophozoites with ingested RBCs.
  1. Name the organism. How is it distinguished from non-pathogenic Entamoeba?
  2. Describe the life cycle of Entamoeba histolytica.
  3. What is the characteristic stool appearance in amoebic dysentery?
  4. What are the extra-intestinal complications? Which is most common?
  5. Compare amoebic liver abscess with pyogenic liver abscess.
  6. What is the drug of choice?
Case 19 - Giardiasis
A child presents with foul-smelling, greasy, non-bloody diarrhea and failure to thrive. Stool examination shows pear-shaped organisms with flagella.
  1. Name the organism. Describe its morphology (trophozoite and cyst).
  2. How is Giardia transmitted?
  3. Why does Giardia cause malabsorption?
  4. How is it diagnosed in the lab?
  5. What is the treatment?
Case 20 - Enteric Worm Infections
A 6-year-old child from a rural area presents with abdominal pain, malnutrition, and perianal itching at night.
  1. What organism causes perianal itching? What is the diagnostic test?
  2. What organisms are responsible for malnutrition in children? How?
  3. Describe the life cycle of Ascaris lumbricoides.
  4. What is Loeffler's syndrome?
  5. What is the drug of choice for common intestinal helminths?

PAPER 2 TOPICS

SECTION D: Respiratory Tract Infections

Case 21 - Pulmonary Tuberculosis
A 30-year-old male presents with a 3-month history of cough with blood-tinged sputum, weight loss, night sweats, and low-grade fever. Chest X-ray shows upper lobe cavitary lesion.
  1. Name the causative organism. Describe its cell wall composition (why is it acid-fast?).
  2. Describe the Ziehl-Neelsen stain procedure.
  3. What is the Mantoux (tuberculin) test? How is it interpreted?
  4. What are the culture media used for M. tuberculosis?
  5. What is CBNAAT/GeneXpert? What does it detect?
  6. Describe the RNTCP drug regimen (DOTS). What are the four first-line drugs?
  7. What is MDR-TB? What is XDR-TB?
  8. What are the Koch's postulates?
Case 22 - Pneumonia
An elderly 65-year-old with diabetes presents with high fever, productive cough with rusty sputum, and consolidation in the right lower lobe on X-ray.
  1. What is the most likely organism in community-acquired pneumonia?
  2. Describe the cultural characteristics of Streptococcus pneumoniae.
  3. What is alpha-hemolysis? How does it differ from beta-hemolysis?
  4. What is the Optochin sensitivity test? Its significance?
  5. Name organisms causing atypical pneumonia. How is Mycoplasma pneumonia different?
  6. Name four causes of hospital-acquired (nosocomial) pneumonia.
Case 23 - Diphtheria
A 5-year-old unvaccinated child presents with fever, sore throat, and a grayish-white membrane on the tonsils. The child has difficulty breathing and a "bull neck" appearance.
  1. Name the causative organism. What is its morphology (characteristic appearance on smear)?
  2. What is the significance of Corynebacterium diphtheriae toxin? Which organs does it affect?
  3. Describe the culture media used: Loeffler's serum slope and Tellurite media.
  4. What is the Elek test? What does it detect?
  5. What is the treatment? What is the role of DPT vaccine?
Case 24 - Whooping Cough
A 2-month-old infant (not yet vaccinated) presents with paroxysmal cough ending in a high-pitched inspiratory whoop, followed by vomiting. The CBC shows marked lymphocytosis.
  1. Name the causative organism.
  2. Describe the virulence factors and mechanism of action of pertussis toxin.
  3. What is the culture medium used for isolation?
  4. Name the three stages of whooping cough with their features.
  5. What is the treatment? What is the role of vaccination?
Case 25 - Influenza
During a winter season, a 40-year-old presents with sudden onset of high fever, myalgia, headache, and dry cough. Within 2 weeks, a large number of people in the same city develop similar symptoms.
  1. Classify influenza virus. What are H and N antigens?
  2. What is antigenic drift vs antigenic shift? Which causes pandemics?
  3. How is influenza diagnosed rapidly?
  4. What is the mechanism of action of oseltamivir (Tamiflu)?
  5. Why is the influenza vaccine reformulated every year?
Case 26 - Meningococcal Disease
A 19-year-old hostel student presents with sudden onset fever, severe headache, neck stiffness, photophobia, and a non-blanching petechial rash all over the body.
  1. Name the causative organism. Describe its morphology.
  2. What is Kernig's sign and Brudzinski's sign?
  3. What is the investigation of choice? How is CSF examined?
  4. What is Waterhouse-Friderichsen syndrome?
  5. What is the drug of choice? What chemoprophylaxis is given to contacts?

SECTION E: CNS Infections

Case 27 - Bacterial Meningitis
A newborn presents with fever, bulging fontanelle, seizures, and lethargy. CSF shows turbid fluid with elevated neutrophils, high protein, and low glucose.
  1. Name the three most common organisms causing neonatal meningitis.
  2. What are the CSF findings that differentiate bacterial from viral and TB meningitis? (Table)
  3. What is the significance of Gram staining the CSF?
  4. What is Group B Streptococcus? How does it cause neonatal meningitis?
  5. What is the treatment of neonatal meningitis?
Case 28 - Viral Encephalitis / Rabies
A 10-year-old boy was bitten by a stray dog 45 days ago. He now presents with hydrophobia, aerophobia, excessive salivation, and agitation.
  1. Describe the rabies virus. What type of virus is it?
  2. What is the pathogenesis of rabies? How does the virus travel to the brain?
  3. What are Negri bodies? Where are they found?
  4. What is the post-exposure prophylaxis (PEP) schedule for rabies?
  5. What is the laboratory diagnosis of rabies?
Case 29 - Neurocysticercosis
A 25-year-old presents with seizures. MRI shows multiple ring-enhancing lesions in the brain. He is a vegetarian but lives in a rural area.
  1. Name the causative organism. Describe its life cycle.
  2. How does a vegetarian get cysticercosis?
  3. What is the difference between taeniasis and cysticercosis?
  4. How is neurocysticercosis diagnosed?
  5. What is the treatment?
Case 30 - Cryptococcal Meningitis
An HIV-positive patient (CD4 = 50 cells/μL) presents with subacute onset headache, fever, and neck stiffness. CSF is clear with mild pleocytosis. India ink preparation shows encapsulated yeast.
  1. Name the organism. What is the significance of the capsule?
  2. What is India ink preparation? What does it show?
  3. What is the latex agglutination test for Cryptococcus?
  4. Why is Cryptococcus more common in immunocompromised patients?
  5. What is the treatment? (Amphotericin B + Flucytosine induction)

SECTION F: Genitourinary & STIs

Case 31 - Gonorrhea
A 24-year-old male presents with acute urethral discharge and dysuria. Gram stain of the discharge shows Gram-negative diplococci within pus cells (intracellular).
  1. Name the causative organism. Describe its morphology and culture characteristics.
  2. What is the Thayer-Martin medium? Why is it used?
  3. What are the complications of gonorrhea in males and females?
  4. What is PID? Name the organisms causing it.
  5. What is the drug of choice? What is the issue of resistance?
Case 32 - Syphilis
A 28-year-old presents with a painless ulcer (chancre) on the genitalia, which healed spontaneously. 6 weeks later, he develops a maculopapular rash on the palms and soles.
  1. Name the causative organism. Why can't it be cultured in vitro?
  2. Name the three stages of syphilis with their features.
  3. What is the VDRL test? What is its principle?
  4. What is the FTA-ABS test? How does it differ from VDRL?
  5. What is congenital syphilis? Name four features.
  6. What is the drug of choice?
Case 33 - Chlamydial Infections
A female presents with painless cervical discharge, and later develops pelvic inflammatory disease. Her male partner has non-gonococcal urethritis.
  1. Name the organism. Why is Chlamydia called an obligate intracellular organism?
  2. What are the two forms of Chlamydia (elementary body vs reticulate body)?
  3. What infections are caused by Chlamydia trachomatis (different serovars)?
  4. What is Lymphogranuloma venereum (LGV)?
  5. What is the treatment of Chlamydial infections?
Case 34 - UTI
A 25-year-old newly married woman presents with dysuria, frequency, and burning micturition. Urine culture shows >10⁵ CFU/mL of a lactose-fermenting, Gram-negative rod.
  1. Name the most likely organism. What is significant bacteriuria?
  2. What is the IMVIC test? What are the results for E. coli?
  3. What are the virulence factors of uropathogenic E. coli?
  4. How is UTI distinguished from contamination in urine culture?
  5. What is the drug of choice for uncomplicated UTI?
Case 35 - Herpes Genitalis
A 22-year-old presents with painful genital vesicles and ulcers. She gives a history of a similar episode 6 months ago.
  1. Name the causative virus. What is the difference between HSV-1 and HSV-2?
  2. What is the mechanism of latency and reactivation of herpes virus?
  3. How is herpes diagnosed in the lab? (Tzanck smear, PCR)
  4. What are the complications of neonatal herpes?
  5. What is the treatment? Can herpes be cured?

SECTION G: Musculoskeletal, Skin & Soft Tissue

Case 36 - Gas Gangrene
A farmer sustains a deep puncture wound from a rusty nail. Three days later, the wound area is swollen, has a foul smell, and gas is palpable in the tissues (crepitus).
  1. Name the causative organism. Classify it (Gram stain, aerobe/anaerobe, spore).
  2. What toxins are produced? What is the role of alpha toxin?
  3. What is the significance of anaerobic infection in deep wounds?
  4. How is gas gangrene treated? (Surgery + Penicillin + HBO)
  5. What is tetanus? How does tetanus toxin differ from gas gangrene toxin in mechanism?
Case 37 - Tetanus
An 8-year-old unvaccinated child sustains a wound. Ten days later, he develops lockjaw (trismus), risus sardonicus, and opisthotonos.
  1. Name the causative organism. Describe its morphology ("drumstick" appearance).
  2. What is the mechanism of action of tetanospasmin?
  3. What is the difference between tetanospasmin and tetanolysin?
  4. What is the treatment of tetanus? (TIG, diazepam, penicillin)
  5. What is the vaccine schedule for tetanus in India?
Case 38 - Leprosy
A 35-year-old presents with hypopigmented, anesthetic skin patches with thickened peripheral nerves.
  1. Name the causative organism. Why can't it be cultured in vitro?
  2. What is the Ridley-Jopling classification of leprosy?
  3. Describe the histopathology of tuberculoid vs lepromatous leprosy.
  4. What is the lepromin test? Interpret its results in different types.
  5. What is the WHO MDT regimen for leprosy?
  6. What are lepra reactions (Type 1 and Type 2)?
Case 39 - Staphylococcal Skin Infections
A child presents with honey-crusted lesions on the face (impetigo). The same child had a bullous rash over the entire body 2 weeks prior (Staphylococcal Scalded Skin Syndrome - SSSS).
  1. Name the toxin responsible for SSSS.
  2. Describe the virulence factors of Staphylococcus aureus.
  3. What is the coagulase test? What is its significance?
  4. What are the toxin-mediated diseases caused by S. aureus?
  5. What is Toxic Shock Syndrome? Name the toxin involved.
Case 40 - Fungal Skin Infections (Dermatophytosis)
A college student presents with itchy, circular, ring-shaped scaly lesion on the thigh (Tinea cruris). He also has white patches on his scalp.
  1. Name the common dermatophytes causing tinea.
  2. How are dermatophytes classified (Trichophyton, Microsporum, Epidermophyton)?
  3. What is the Woods lamp examination used for?
  4. How is dermatophytosis diagnosed in the lab? (KOH mount)
  5. What is the difference between tinea capitis, tinea corporis, tinea pedis, and tinea cruris?
  6. What is the treatment? (Topical vs systemic)

SECTION H: Zoonotic & Miscellaneous

Case 41 - Brucellosis
A veterinarian presents with undulant fever, malaise, joint pain, and hepatosplenomegaly. He regularly handles cattle and assists in deliveries.
  1. Name the causative organism. What is its mode of transmission?
  2. What is the significance of undulant fever pattern?
  3. How is brucellosis diagnosed? (Blood culture, serology - Standard agglutination test)
  4. What are the complications of brucellosis?
  5. What is the treatment? (Doxycycline + Rifampicin)
Case 42 - Leptospirosis
A farmer who waded through floodwater develops fever, myalgia, conjunctival suffusion, jaundice, and renal failure.
  1. Name the causative organism. Describe its morphology.
  2. What is the reservoir and mode of transmission?
  3. What is Weil's disease?
  4. How is leptospirosis diagnosed? (Dark-field microscopy, MAT)
  5. What is the treatment?
Case 43 - Plague
During an outbreak in a rural area, a patient presents with rapidly enlarging, painful, tender lymph nodes in the groin (bubo), fever, and septicemia.
  1. Name the causative organism. Describe its virulence factors.
  2. What are the three clinical forms of plague?
  3. What is the role of the rat flea (Xenopsylla cheopis) in plague transmission?
  4. What is the "safety pin" appearance on smear?
  5. What is the treatment? (Streptomycin/Doxycycline)
Case 44 - Dengue Fever
A 16-year-old presents with sudden high fever, severe headache, retro-orbital pain, rash, and thrombocytopenia (platelets = 40,000). On day 4, he develops abdominal pain and restlessness.
  1. Classify dengue virus. What are the four serotypes?
  2. What is the Aedes aegypti mosquito breeding pattern?
  3. What is dengue hemorrhagic fever vs dengue shock syndrome?
  4. What is NS1 antigen? When is it used for diagnosis?
  5. What are the warning signs of severe dengue?
  6. What is the treatment? (Supportive - no antiviral)
Case 45 - Hepatitis B (Chronic)
A 40-year-old man is found to be HBsAg positive during a routine blood donation camp. He has no symptoms but liver function tests show mild elevation.
  1. Describe the complete serological profile of Hepatitis B (all markers and their interpretation).
  2. What is the significance of HBeAg vs anti-HBe?
  3. What is the natural history of chronic HBV infection?
  4. What is the risk of HBV-related hepatocellular carcinoma?
  5. What is the treatment of chronic HBV? (Tenofovir/Entecavir)
  6. Describe the HBV vaccine schedule.
Case 46 - Oncogenic Viruses
A 50-year-old presents with nasopharyngeal carcinoma. He tests positive for EBV antibodies.
  1. Name five oncogenic viruses and the cancers they cause.
  2. What is the mechanism by which EBV causes malignancy?
  3. What is infectious mononucleosis? Name its clinical features and lab findings (Paul-Bunnell test).
  4. What is HPV? Which serotypes cause cervical cancer? What is the mechanism?
  5. What is the HPV vaccine? Who should receive it?
Case 47 - Surgical Site Infection (SSI)
A patient who underwent abdominal surgery 5 days ago develops fever, wound discharge, and redness around the incision site.
  1. Define SSI. What are the three levels of SSI?
  2. Name the common organisms causing SSI.
  3. What are the preventive measures of SSI? (Preoperative, intraoperative, postoperative)
  4. What is antibiotic prophylaxis? Which antibiotics are used for clean vs contaminated wounds?
  5. What is hospital-acquired infection (HAI)? Name four types.
Case 48 - Immunodeficiency & Opportunistic Infections
A 4-year-old child presents with recurrent bacterial infections. Investigations reveal absence of all immunoglobulin classes. His brother died of similar infections.
  1. What is the diagnosis? Name the condition (Bruton's agammaglobulinemia).
  2. Classify primary immunodeficiency disorders (B-cell, T-cell, combined, complement, phagocyte defects).
  3. What infections are seen in B-cell deficiency vs T-cell deficiency?
  4. What is SCID? What are its causes?
  5. How is immunoglobulin replacement therapy used?

RAPID FIRE: Short Case-Based Scenarios

49. A smear from a throat swab shows Chinese letter (V/L) arrangement of Gram-positive rods.
  • Q: What organism? What media is used for culture?
50. A patient has a wound with "sulfur granules" in the discharge.
  • Q: Name the organism. What type of microbe is it?
51. A diabetic patient has black necrotic lesions on the palate and nasal septum. KOH mount shows non-septate hyphae with right-angle branching.
  • Q: What is the diagnosis? Name the organism. What is the treatment?
52. A child from Bihar presents with fever, splenomegaly, and pancytopenia. Bone marrow shows amastigotes inside macrophages.
  • Q: Name the disease and organism. What is the vector?
53. A patient's serum agglutinates Proteus OX-19 strain in high titer after a febrile illness following a tick bite.
  • Q: What disease is this? What is the Weil-Felix test?
54. A CSF sample from a meningitis patient shows "ink-cap mushroom" appearance with encapsulated yeast on India ink preparation.
  • Q: Name the organism. What is the lab diagnosis?
55. A patient is diagnosed with intestinal roundworm infection. The egg is oval, golden brown with a thick mammillated shell.
  • Q: Name the egg. What is the worm? Describe its life cycle briefly.
56. A female presents with frothy, yellow-green vaginal discharge with a "strawberry cervix" on examination.
  • Q: Name the organism. How is it diagnosed? What is the drug of choice?
57. A laboratory worker accidentally inoculates himself with a needle used for a Brucella culture.
  • Q: What post-exposure management should be done?
58. A sputum smear shows beaded, acid-fast bacilli. The culture on Lowenstein-Jensen medium at 37°C shows "rough, tough, and buff" colonies after 6 weeks.
  • Q: Name the organism. What are the colony characteristics called?

KEY EXAM TIPS FOR RGUHS

  1. Always include - Lab diagnosis (culture, stain, serology) in every answer
  2. Draw diagrams where relevant - Life cycles (malaria, Ascaris), antibody structure, bacterial curves
  3. Compare and contrast questions are frequent - e.g., TB vs atypical Mycobacteria, amoebic vs pyogenic abscess, VDRL vs TPHA
  4. Toxin-based diseases - Cholera, Diphtheria, Tetanus, Gas Gangrene, Staph food poisoning are high-yield
  5. Recent additions - COVID-19, antimicrobial resistance, biofilm formation may appear as short notes
  6. Practical-based questions - ZN stain procedure, VDRL test, Widal test, Kirby-Bauer method are exam favorites
This set covers 58 case-based questions across all major RGUHS microbiology topics. Would you like me to provide detailed model answers for any specific case or topic?

Make a detailed answer key document covering pathophysiology and lab diagnosis for each case

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