RGUHS MD Microbiology: most-asked theory questions
Across 22 exam sittings recorded in this AnswerBank (2016–2026), these topics appeared in at least two distinct sittings. Use the list to guide your revision, then explore the full model answers.
A sitting here means the year and month recorded in the bank. A topic counts once in that sitting, even if it appeared in several questions or papers. Topics are ranked by sittings, then most recent year, then name. Past recurrence describes these papers; it does not predict the next exam.
Repeated theory topics
Each entry includes its exam sittings, papers and one original question from the bank.
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Dermatophytoses
asked in 9 of 22 sittings
Sittings: 2016 July · 2016 November · 2018 November · 2020 November · 2021 November · 2022 May · 2025 May · 2025 September · 2026 April
Papers: Paper III
Example question
Dermatophytoses
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Visceral leishmaniasis (kala-azar)
asked in 9 of 22 sittings
Sittings: 2017 May · 2017 November · 2018 May · 2018 November · 2019 November · 2020 July · 2020 November · 2024 June · 2025 October
Papers: Paper IV
Example question
Describe etio-pathogenesis and laboratory diagnosis of visceral leishmaniasis
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Gas gangrene — pathogenesis and diagnosis
asked in 8 of 22 sittings
Sittings: 2017 November · 2018 November · 2020 November · 2021 November · 2023 December · 2024 June · 2025 September · 2026 April
Papers: Paper II
Example question
Gas gangrene-pathogenesis and laboratory diagnosis
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Monoclonal antibodies
asked in 8 of 22 sittings
Sittings: 2016 June · 2016 November · 2019 May · 2019 November · 2020 November · 2023 December · 2025 September · 2026 April
Papers: Paper I
Example question
Describe Hybridoma technology and applications of monoclonal antibodies in diagnosis and clinical management
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Lymphatic filariasis
asked in 8 of 22 sittings
Sittings: 2017 May · 2019 May · 2020 July · 2021 August · 2021 November · 2023 December · 2024 June · 2025 June
Papers: Paper IV
Example question
Pathogenesis, pathogenicity and laboratory diagnosis of filariasis
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Tuberculosis
asked in 8 of 22 sittings
Sittings: 2016 November · 2017 May · 2019 May · 2020 July · 2020 November · 2024 June · 2025 May · 2025 September
Papers: Paper II
Example question
Describe pathogenesis and laboratory diagnosis of tuberculosis. Discuss role of automation in TB diagnosis
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Toxoplasmosis
asked in 7 of 22 sittings
Sittings: 2017 May · 2019 May · 2020 July · 2020 November · 2021 August · 2021 November · 2025 June
Papers: Paper IV
Example question
Discuss the morphology, pathogenesis, laboratory diagnosis and control of Toxoplasma gondii
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Helicobacter pylori
asked in 6 of 22 sittings
Sittings: 2016 June · 2017 May · 2017 November · 2020 November · 2021 July · 2025 September
Papers: Paper II
Example question
What is the role of H.pylori in acid peptic disease? Describe pathogenesis, laboratory diagnosis and management of acid peptic disease
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Echinococcus granulosus and hydatid disease
asked in 6 of 22 sittings
Sittings: 2016 November · 2018 May · 2019 November · 2020 July · 2021 November · 2023 December
Papers: Paper IV
Example question
Echinococcus granulosus.
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Antifungal susceptibility testing
asked in 5 of 22 sittings
Sittings: 2016 November · 2017 November · 2021 August · 2022 May · 2026 April
Papers: Paper III
Example question
Antifungal susceptibility testing for yeasts
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Mycetoma
asked in 5 of 22 sittings
Sittings: 2016 July · 2017 May · 2020 July · 2021 August · 2026 April
Papers: Paper III
Example question
Mycetoma – etiological agents, pathogenesis and laboratory diagnosis
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T lymphocytes
asked in 5 of 22 sittings
Sittings: 2017 May · 2024 June · 2025 May · 2025 September · 2026 April
Papers: Paper I
Example question
Describe the mechanisms and role of various immune cells in humoral and cell mediated immunity. Discuss their functions and justify that T helper cells are central cells in immune response generation
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Brucellosis
asked in 5 of 22 sittings
Sittings: 2017 November · 2018 May · 2019 May · 2021 November · 2025 September
Papers: Paper II
Example question
Define zoonosis. How has it affected the infectious diseases? Describe pathogenesis and laboratory diagnosis of Brucellosis
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Histoplasma capsulatum and histoplasmosis
asked in 5 of 22 sittings
Sittings: 2018 May · 2021 November · 2022 May · 2025 May · 2025 September
Papers: Paper III
Example question
Define dimorphic fungi. Describe the morphology, pathogenesis and laboratory diagnosis of Histoplasma capsulatum.
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Strongyloides stercoralis
asked in 5 of 22 sittings
Sittings: 2017 November · 2020 November · 2021 August · 2021 November · 2025 October
Papers: Paper IV
Example question
Enumerate various parasitic infections in AIDS. Describe life cycle and laboratory diagnosis of Strongyloides stercoralis. Discuss hyperinfection and disseminated strongyloidosis
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Paragonimus westermani
asked in 5 of 22 sittings
Sittings: 2016 November · 2017 November · 2020 November · 2022 May · 2023 December
Papers: Paper IV
Example question
Paragonimus westermani.
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Schistosomiasis (bilharziasis)
asked in 5 of 22 sittings
Sittings: 2016 November · 2019 May · 2020 July · 2021 August · 2021 November
Papers: Paper IV
Example question
Classify Trematodes. Write in detail the epidemiology, morphology, life cycle, pathogenesis and laboratory diagnosis of Schistosoma haematobium.
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Laboratory diagnosis of syphilis
asked in 5 of 22 sittings
Sittings: 2016 June · 2018 November · 2019 May · 2020 July · 2020 November
Papers: Paper II
Example question
Enumerate sexually transmitted diseases. Write in detail about laboratory diagnosis of syphilis.
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Cultivation of pathogenic parasites
asked in 4 of 22 sittings
Sittings: 2020 November · 2021 August · 2025 October · 2026 April
Papers: Paper IV
Example question
Cultivation of protozoan parasites
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Fluorescence microscopy
asked in 4 of 22 sittings
Sittings: 2016 November · 2018 May · 2020 July · 2026 April
Papers: Paper I
Example question
Describe principle, advantages and applications of different types of fluorescent microscopes
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Genetic engineering in vaccine production (recombinant vaccines)
asked in 4 of 22 sittings
Sittings: 2023 December · 2024 June · 2025 June · 2026 April
Papers: Paper I · Paper IV
Example question
Describe the applications of genetic engineering technology for production of vaccines
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Influenza virus – antigenic variation and vaccines
asked in 4 of 22 sittings
Sittings: 2017 May · 2019 November · 2024 June · 2026 April
Papers: Paper III
Example question
Write about antigenic variations in influenza virus and its role in outbreaks. Add a note on influenza vaccines
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Plasmodium falciparum — life cycle and diagnosis
asked in 4 of 22 sittings
Sittings: 2017 May · 2019 May · 2020 July · 2026 April
Papers: Paper IV
Example question
Depict asexual life cycle of plasmodium falciparum. Write about the laboratory diagnosis of malaria
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Primary atypical pneumonia (Mycoplasma pneumoniae)
asked in 4 of 22 sittings
Sittings: 2018 May · 2019 May · 2025 May · 2026 April
Papers: Paper II
Example question
Primary atypical pneumonia
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Hepatitis B virus infection
asked in 4 of 22 sittings
Sittings: 2019 November · 2024 June · 2025 May · 2025 September
Papers: Paper III
Example question
Enumerate viruses causing Hepatitis. Discuss in detail pathogenesis, laboratory diagnosis and prophylaxis of Hepatitis B viruses. Add a note on recent concepts about viral hepatitis.
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