Discussion
Which of the following is an aerobe and not an anaerobe?
Answer: D
Correct answer: Nocardia asteroides
Nocardia is a strict aerobe of the soil, acquired by inhalation or inoculation, and it grows readily on ordinary media in air. Actinomyces israelii is an anaerobe or microaerophile of the mouth, Bacteroides fragilis is an obligate anaerobe of the gut, and Veillonella parvula is an anaerobic Gram-negative coccus. The aerobic-anaerobic split, together with partial acid-fastness, is the standard way of separating Nocardia from Actinomyces, which they otherwise closely resemble.
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