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Enterococcus in Polymicrobial IAI — SCE Infectious Diseases MCQ

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ModerateAntimicrobial StewardshipEnterococcus in Polymicrobial IAISCE Infectious Diseases

A 55-year-old man develops a wound infection after colorectal surgery. Deep wound cultures grow Enterococcus faecalis. The surgeon asks whether this Enterococcus requires targeted treatment in the context of polymicrobial intra-abdominal infection where other organisms (E. coli, B. fragilis) are also present. What is the recommendation?

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Correct answer: E — Enterococcus in polymicrobial intra-abdominal infection does NOT usually require specific targeted treatment — standard regimens (Ceftriaxone plus Metronidazole or Piperacillin/Tazobactam) provide adequate empirical coverage

In polymicrobial intra-abdominal infections (post-surgical, diverticular), Enterococcus faecalis is frequently isolated alongside Gram-negatives and anaerobes. Evidence shows that specifically targeting Enterococcus in this context (when the patient is responding to empirical therapy covering other pathogens) does not improve outcomes. IDSA/SIS guidelines recommend that Enterococcus in polymicrobial intra-abdominal infection does NOT routinely require targeted coverage UNLESS the patient is immunocompromised, has healthcare-associated infection, has prosthetic material, or is not responding to initial therapy.

Reference: BSAC 2017 – Intra-abdominal infections; SIS/IDSA 2010 – Complicated IAI