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NBME Free 120 Answers

free120/Block 1/Question#30 (reveal difficulty score)
A 16-year-old boy is brought to the physician ...
Escherichia coli ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–

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 +2  upvote downvote
submitted by โˆ—bwdc(697)

While E coli is normal gut flora, your body would prefer it stay intraluminal.

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tallerthanmymom  Just remember that E.Coli and Bacteriodes Fragilis (sp?) are the 2 main gutys that cause intraperitoneal infections from the gut. +11
bharatpillai  Why not citrobacter though? +10
mamed  Common organisms involved in gangrenous and perforated appendicitis include Escherichia coli, Peptostreptococcus, Bacteroides fragilis, and Pseudomonas species (UpToDate) +10
athenathefirst  Nobody mentioned why it's not citrobacter. It's also an inhabitant of the intestinal flora. What an annoying quetion. +

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submitted by โˆ—hello(429)

The patient developed peritonitis due to a perforated appendix. Peritonitis is an intra-abdominal infection.

The most common intra-abdominal microbes to cause intra-abdominal infections are Bacteroides and E. coli.

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