Commensal Bacteria: An Under-recognized Cause of Pneumonia.

Musher, Daniel M; Kulkarni, Prathit A; Rodriguez-Barradas, Maria C · J Infect Dis · 2026

Level V

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Abstract

An etiologic agent is not identified in many cases of community-acquired pneumonia. The so-called "normal respiratory flora" or "commensal bacteria" may be responsible for a substantial proportion of cases.

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