A 35 year old man has a three day history of a productive cough



Question: USMLE step1 Mcq 21:
A 35 year old man has a three day history of a productive cough. His x-ray shows evidence of bilateral consolidation.A sputum culture grows a gram positive organism that is lysed by ethyl hydrocupriene (Optochin) These features are characteristic of
a) Streptococcus pneumoniae
b) Bacteroides fragilis
c) Coxiella burnetii
d) Escherichia coli
e) Haemophilus influenzae

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