Question

Which organism causes acute bacterial prostatitis?

• A. Enterococcus
• B. Streptococcus viridans
• C. Peptostreptococcus
• D. E. coli

Hint:

Think of the commonest uropathogen ascending into the prostate.

Answer 1

The Correct Option is D

Step 1: Think of where the bug comes from. The prostate gets infected when urethral or bladder flora track up the prostatic ducts, so the culprit is a typical urinary tract organism. Step 2: The dominant uropathogen everywhere is the gram-negative rod $Escherichia\ coli$, which alone is responsible for the majority (about 50-80%) of acute bacterial prostatitis. Step 3: Rank the distractors: Enterococcus contributes a small fraction, while Streptococcus viridans (mouth flora, endocarditis) and the anaerobe Peptostreptococcus essentially never seed the prostate by this route. Step 4: Pick the classic gram-negative uropathogen. \[\boxed{\text{E. coli}}\]