Concept

Moraxella

Summary
Moraxella is a genus of gram-negative bacteria in the family Moraxellaceae. It is named after the Swiss ophthalmologist Victor Morax. The organisms are short rods, coccobacilli, or as in the case of Moraxella catarrhalis, diplococci in morphology, with asaccharolytic, oxidase-positive, and catalase-positive properties. M. catarrhalis is the clinically most important species under this genus. Roles in disease The organisms are commensals of mucosal surfaces and sometimes give rise to opportunistic infection.
  • M. catarrhalis usually resides in respiratory tract, but can gain access to the lower respiratory tract in patients with chronic chest disease or compromised host defenses, thus causing tracheobronchitis and pneumonia. For example, it causes a significant proportion of lower respiratory tract infections in elderly patients with COPD and chronic bronchitis. It is also one of the notable causes of otitis media and sinusitis. It causes similar sym
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