  
{"id":18156,"date":"2025-07-30T05:47:18","date_gmt":"2025-07-30T05:47:18","guid":{"rendered":"https:\/\/www.diginerve.com\/blogs\/?p=18156"},"modified":"2025-07-30T06:12:11","modified_gmt":"2025-07-30T06:12:11","slug":"neet-pg-microbiology-previous-year-questions","status":"publish","type":"post","link":"https:\/\/www.diginerve.com\/blogs\/neet-pg-microbiology-previous-year-questions\/","title":{"rendered":"NEET PG Previous Year Microbiology Questions with Answers"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Microbiology remains one of the most important yet often underestimated subjects in NEET PG. With its mix of factual memory and clinical relevance, mastering Microbiology can significantly boost students\u2019 overall scores. In this blog, we bring you the NEET PG Microbiology recall questions, their correct answers and clear explanations. We also highlight <strong><a href=\"https:\/\/www.diginerve.com\/blogs\/important-topics-for-microbiology-in-mbbs\/\">microbiology high-yield NEET PG topics<\/a><\/strong> you must focus on.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">NEET PG Microbiology Previous Year Questions: Memory-Based Recall Questions\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The following MCQs are based on student recall and expert discussions after the NEET PG last 5-year exam. These questions reflect the exam\u2019s focus on clinical applications, diagnostic techniques and basic organism knowledge.\u00a0<\/span><\/p>\n<p><b>Q1 . Nocardia shows which type of staining?\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Gram-negative<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Gram-positive and acid-fast\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Gram-variable<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Non-staining<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Gram-positive and acid-fast\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Nocardia is a Gram-positive, weakly acid-fast, branching filamentous bacterium. It retains some carbol fuchsin due to mycolic acids, thus appearing weakly acid-fast.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q2. After a positive ELISA for HIV, what is the next confirmatory test?<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> PCR<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> CD4 count<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Western blot\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Antigen detection<\/span><\/li>\n<\/ol>\n<p><strong>Answer: C. Western blot\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Western blot was the standard confirmatory test after a positive HIV ELISA. Nowadays, fourth-generation assays and nucleic acid tests are preferred; however, traditionally, the ELISA-Western blot workflow was used.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q3. A 3-week-old neonate presents with fever, lethargy and seizures. Blood culture is taken and grown on sheep blood agar. The lab report notes enhanced hemolysis in an arrowhead pattern when streaked perpendicular to Staphylococcus aureus. Which diagnostic test does this represent, and what is the most likely organism?<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Coagulase test \u2013 Staphylococcus aureus<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> CAMP test \u2013 Streptococcus agalactiae\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Elek test \u2013 Corynebacterium diphtheriae<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Nagler reaction \u2013 Clostridium perfringens<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. CAMP test \u2013 Streptococcus agalactiae\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">The CAMP test is used to detect Streptococcus agalactiae (Group B Strep), which shows enhanced \u03b2-hemolysis when grown perpendicular to Staph. aureus on blood agar. This organism is a common cause of neonatal sepsis and meningitis.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q4. A 34-year-old HIV positive man presents with painless, beefy-red genital ulcers that bleed on touch. There is no lymphadenopathy. A Giemsa-stained smear from the ulcer shows intercellular organisms with a safety pin appearance. What is the most likely causative organism?<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Chlamydia trachomatis<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Klebsiella (Calymmatobacterium) granulomatis\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Haemophilus ducreyi<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Treponema pallidum<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Klebsiella (Calymmatobacterium) granulomatis\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Donovanosis (granuloma inguinale) is caused by Klebsiella granulomatis. It presents as painless genital ulcers with characteristics of Donovan bodies (intracellular safety-pin-shaped organisms). It is differentiated from syphilis and chancroid based on ulcer characteristics and microscopic findings.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q5. A patient undergoing pre-employment screening tests positive for HBsAg and HBeAg. ALT is mildly elevated, and the patient is asymptomatic. What does the presence of HBeAg indicate?\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Past resolved infection<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Immunity due to vaccination<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> High infectivity\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Window period of infection<\/span><\/li>\n<\/ol>\n<p><strong>Answer: C. High infectivity\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">HBeAg is a marker of active replication of the hepatitis B virus. Its presence implies high infectivity. HBsAg indicates current infection, and anti-HBs suggests immunity.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q6. A 45-year-old farmer from eastern India presents with chronic cough, weight loss and mediastinal lymphadenopathy. Chest X-ray shows calcified hair nodes. A fungal culture at 25 degrees shows mould, while at 37 degrees it shows yeast. Which fungus is most likely?\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Candida albicans<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Histoplasma capsulatum\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Cryptococcus neoformans<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Aspergillus fumigatus<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Histoplasma capsulatum\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Histoplasma capsulatum is a dimorphic fungus endemic to areas like eastern India and the Ohio River Valley. It mimics TB clinically and radiologically but is identified via fungal cultures showing dimorphism (mould at 25\u00b0C and yeast at 37\u00b0C).<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q7. A 28-year-old man presents with fever, headache and neck stiffness. Lumbar puncture reveals clear CSF, elevated lymphocytes, normal glucose and slightly elevated protein. What is the most probable diagnosis?\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Bacterial meningitis<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Viral meningitis<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Tuberculous meningitis<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Fungal meningitis<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Viral meningitis\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Viral meningitis typically presents with lymphocytic predominance, normal glucose and mildly elevated protein. In contrast, bacterial meningitis shows neutrophilic predominance and low glucose levels.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q8. A young adult presents with a dry cough, fever and malaise. Chest X-ray shows diffuse infiltrates disproportionate to mild clinical findings. The cold agglutinin test is positive. Which organism is most likely responsible?<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Klebsiella pneumoniae<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Mycoplasma pneumoniae\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Streptococcus pneumoniae<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Legionella pneumophila<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Mycoplasma pneumoniae\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Mycoplasma pneumoniae causes atypical pneumonia with minimal symptoms but striking radiological findings. It lacks a cell wall, hence is not seen on Gram stain and is resistant to beta-lactams. A positive cold agglutinin test supports the diagnosis.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q9. How does tetanospasmin toxin from Clostridium tetani cause symptoms?\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Inhibits protein synthesis<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Blocks acetylcholine release at the NMJ<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Inhibits inhibitory neurotransmitter release\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Causes demyelination<\/span><\/li>\n<\/ol>\n<p><strong>Answer: C. Inhibits inhibitory neurotransmitter release\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Tetanospasmin is a neurotoxin that blocks the release of GABA and glycine from inhibitory interneurons, leading to muscle rigidity and spasms seen in tetanus.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q10. The Weil-Felix test is used to detect infections caused by:\u00a0<\/b><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li><span style=\"font-weight: 400;\"> Leptospira interrogans<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Rickettsia\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Treponema pallidum<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Borrelia burgdorferi<\/span><\/li>\n<\/ol>\n<p><strong>Answer: B. Rickettsia\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Weil-Felix test is an older agglutination test used to detect Rickettsial infections. It is based on cross-reaction between Proteus strains (OX2, OX19, OXK) and Rickettsial antigens.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Microbiology High-Yield NEET PG Topics: Students must revise\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Alongside solving the NEET PG Microbiology previous year paper, you should thoroughly revise the following high-yield areas:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bacterial classification and staining techniques<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Culture media and diagnostic tests (e.g. VDRL, ELISA, PCR)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Virology markers (HBV, HIV, COVID)\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mycology- especially dimorphic fungi\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vaccines (types, schedules and cold chain)\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hospital-acquired infections and sterilisation\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Parasitology \u2013 malaria, filaria, amoeba\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zoonotic diseases and their vectors\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Analysing the NEET PG Microbiology recall questions with answers is a powerful strategy to identify knowledge gaps and focus on microbiology high-yield NEET PG topics. These memory-based questions not only reflect the exam pattern but also help in last-minute revision before exams like NEET PG, FMGE or INICET.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microbiology remains one of the most important yet often underestimated [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":16595,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[768,766,767],"class_list":["post-18156","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neet-pg","tag-microbiology-pyqs-neet-pg","tag-neet-pg-microbiology","tag-neet-pg-previous-year-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NEET PG Previous Year Microbiology Questions with Answers - Your Guide At Every Step to Become The Top Doctor<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.diginerve.com\/blogs\/neet-pg-microbiology-previous-year-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NEET PG Previous Year Microbiology Questions with Answers - 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