Which of the following types of pneumonia listed below is best characterized by an infective agent that produces sputum samples with a peptidoglycan cell wall,
expresses endotoxins, replicates readily in broth and on agar, grows in clusters, has pili, and does not stain when exposed to crystal violet?A)
Chlamydial
B)
Viral
C)
Mycoplasmal
D)
Bacterial
Ans:
D
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Although chlamydiae, viruses, and mycoplasmas all can cause pneumonia, only bacteria have all of these characteristics. Chlamydiae and viruses are obligate intracellular organisms and therefore would grow only in cell culture, and mycoplasmas lack the peptidoglycan cell wall typical of bacteria.
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