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Most common cause of SBP?

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what is the most common cause of spontaneous bacterial peritonitis??
i think goljan mentioned it but i forget (and i think different sources say different bacteria), i know its asked alot on step1. thanks
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Traditionally, three fourths of spontaneous bacterial peritonitis infections have been caused by aerobic gram-negative organisms (50% of these being Escherichia coli), with one fourth of these infections are due to aerobic gram-positive organisms (19% streptococcal species). E coli is demonstrated in the image below.

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