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Aerococcus urinae — SCE Infectious Diseases MCQ

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HardHealthcare-Associated InfectionsAerococcus urinaeSCE Infectious Diseases

Blood cultures from an older man with urinary obstruction repeatedly grow Aerococcus urinae and he has a new murmur. How should the result be interpreted?

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Correct answer: D — Investigate genuine Aerococcus bacteraemia for a urinary source and endocarditis

The best answer is “Investigate genuine Aerococcus bacteraemia for a urinary source and endocarditis”. A. urinae is an established uropathogen that can cause bloodstream infection and endocarditis, particularly in older men with urological disease; repeated isolation plus a murmur is clinically significant. Aerococcus urinae can be a genuine urinary and bloodstream pathogen; species identification and susceptibility interpretation matter particularly when endocarditis is possible. The ESC guideline covers blood-culture-negative endocarditis, antimicrobial strategy, oral step-down selection and surgical indications.

Reference: Clinical microbiology study of Aerococcus urinae: https://pubmed.ncbi.nlm.nih.gov/11682525/ 2023 ESC Guidelines for infective endocarditis: https://www.escardio.org/Guidelines/Clinical-Practice-Guidelines/Endocarditis-Guidelines