How often does M catarrhalis cause acute bacterial rhinosinusitis (sinus infection)?

Updated: Mar 01, 2018
  • Author: Itzhak Brook, MD, MSc; Chief Editor: Michael Stuart Bronze, MD  more...
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M catarrhalis are gram-negative, oxidase-positive, aerobic diplococci. M catarrhalis is the responsible pathogen in 2-10% of acute bacterial rhinosinusitis cases in adults. Beta-lactamase production is also the mechanism of antimicrobial resistance for M catarrhalis. Of isolates from the paranasal sinus, 98% were found to be beta-lactamase–positive for M catarrhalis.

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