Moraxella catarrhalis is a topic covered in the Johns Hopkins Antibiotic (ABX) Guide.

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MICROBIOLOGY

  • Gram-negative diplococcus, appears identical to N. gonorrhoeae.
    • Previously known as Branhamella
    • May occasionally be misidentified in the lab as N. cinerea, N. flavescens, or as a glucose-negative strain of N. gonorrhoeae.
  • Grows easily on blood chocolate agar, 28º C.
  • Colonizes upper airways in 5-15% of population, found only in humans.
    • Most frequently found as part of normal flora for infants and children, decreases in adults.
  • Commonly produces beta-lactamase, 95% of strains resistant to amoxicillin.

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Last updated: May 29, 2016