A 23-year-old man presents to the GP for a two-day history of dry cough. Temperature is 100.8F. Auscultation of the chest reveals mild, diffuse bilateral crackles. A chest x-ray is shown below.
The causal organism for this patient’s condition can pass through a 0.45 μm filter whereas gram-negative rods cannot. Which of the following microbial structures best accounts for this difference?
Capsular polysaccharide
Capsular protein
Dipicolinic acid
Lipoteichoic acid
Peptidoglycan
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Cut-to-the-chase Answer (0:58):
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HY USMLE Answer (8:03):
