What are the most significant infections caused by Moraxella catarrhalis?

Updated: Sep 20, 2018
  • Author: Michael Constantinescu, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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The most significant infections caused by M catarrhalis are upper respiratory tract infections (URTIs) such as otitis media and sinusitis in children and lower respiratory tract infections (LRTIs) in adults. Infections with M catarrhalis in adults are more common if underlying conditions are present, especially if the patient is elderly. In a study of 42 cases of pneumonia with M catarrhalis isolated as the single agent in sputum cultures, the mortality rate attributable to the underlying problems within 3 months of pneumonia was 45%. [2]

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