4 MCQs in Microbiology for NEET PG
A 52-year-old woman from Chennai with a 2-month history of progressive cough, hemoptysis, and constitutional symptoms presents to the chest clinic. Chest X-ray shows right upper lobe cavitary infiltrates. Sputum smear microscopy is negative for acid-fast bacilli on three separate occasions. Culture on Löwenstein-Jensen medium at 37°C shows growth of acid-fast bacilli after 3 weeks. The colonies are yellow when exposed to light but revert to buff color in the dark. Biochemical tests show niacin negativity and nitrate reduction positivity. What is the most likely organism?
A 38-year-old man from rural Maharashtra presents with a 3-month history of progressive cough, low-grade fever, and weight loss. Chest X-ray shows bilateral upper lobe infiltrates with cavitation. Sputum smear microscopy is negative for acid-fast bacilli on three occasions. Culture on Löwenstein-Jensen medium at 37°C shows no growth after 8 weeks, but growth appears on Löwenstein-Jensen medium incubated at 25°C after 6 weeks. The colonies are buff-colored, rough, and non-pigmented. What is the most likely diagnosis?
Which of the following atypical mycobacteria is most commonly associated with cervical lymphadenitis in children and is typically resistant to isoniazid?
Mycobacterium marinum is most commonly acquired through contact with contaminated water in which of the following settings?
Ready to test yourself?
Test your Microbiology knowledge with AI-powered MCQs and detailed explanations — no signup required to try.
Sign up free and practice all 4 Atypical Mycobacteria MCQs with AI-powered explanations tailored to your performance.
Create Free Account