A 38 year old farmer is seen with severe headache and fever


Question:   USMLE step 1 Mcq 10
A 38 year old farmer is seen with severe headache and fever. He has a history of a ten day cough with bloody sputum and consolidation on a chest x-ray showed for which he was given erythromycin by his physician. Physical examination was unremarkable except for bilateral is inspiratory crackles and a lumbar puncture was performed. This demonstrated a highly pleomorphic coccobacillii with gram-negative cell wall.
These features are characteristic of

a) Streptococcus pneumoniae
b) Bacteroides fragilis
c) Coxiella burnetii
d) Escherichia coli
e) Haemophilus influenzae

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