Moraxella species
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MICROBIOLOGY
- Gram-negative diplococcus [Fig], appears identical to N. gonorrhoeae.
- Previously known as Branhamella.
- M. catarrhalis is the major human pathogen.
- Occasional cases of other Moraxella species described.
- M. nonliquefaciens has been seen in highly immunocompromised patients. May occasionally be misidentified in the lab as N. cinerea, N. flavescens, or as a glucose-negative strain of N. gonorrhoeae.
- Occasional cases of other Moraxella species described.
- Frequently missed in respiratory cultures because colonies resemble commensal Neisseria, which are normal flora.
- Grows easily on blood chocolate agar, grows well at 28º C.
- Colonizes upper airways in 5-15% of the 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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MICROBIOLOGY
- Gram-negative diplococcus [Fig], appears identical to N. gonorrhoeae.
- Previously known as Branhamella.
- M. catarrhalis is the major human pathogen.
- Occasional cases of other Moraxella species described.
- M. nonliquefaciens has been seen in highly immunocompromised patients. May occasionally be misidentified in the lab as N. cinerea, N. flavescens, or as a glucose-negative strain of N. gonorrhoeae.
- Occasional cases of other Moraxella species described.
- Frequently missed in respiratory cultures because colonies resemble commensal Neisseria, which are normal flora.
- Grows easily on blood chocolate agar, grows well at 28º C.
- Colonizes upper airways in 5-15% of the 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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