<prompt> All are true about primary bacterial peritonitis, EXCEPT:Ascitic fluid PMN count 250 is diagnosticMicrobiology of PBP is distinctiveSome patients may be totally asymptomaticUsually does not respond to routine antimicrobial therapy  <response>: PBP is commonly present with fever, but it can present without any symptoms too. Ascitic fluid analysis should be performed in all suspected cases and PMN 250l is diagnostic of PBP. Escherichia coli are most commonly encountered as the cause of PBP. In PBP, a single organism is typically isolated. PBP is usually treated with cefotaxime and it responds very well to it. Ref: Harrison, E-18, P-1081. 