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Microbiology

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Mycobacterium

Question
17 out of 22
 

A 60-year-old man with a chronic cough, bloody sputum, and marked weight loss is diagnosed as having tuberculosis. A "serpentine-like" colonial morphology is noted on Lowenstein-Jensen agar. This latter finding is caused by which of the following factors?



A A large "slimy" capsule
B Wax D

C Coagulase
D Cord factor

Ans. D Cord factor

Virulent strains of M. tuberculosis grow in a characteristic "serpentine" cordlike pattern, whereas avirulent strains do not. Virulence of the organism is correlated with cord factor (trehalose dimycolate).

Mycobacterium Flashcard List

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