Moraxella Catarrhalis

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Last updated 4:35 AM on 3/17/26
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11 Terms

1
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This organism is isolated from humans only

True

2
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Is normal commensal of the respiratory tract

True

3
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Has become an important opportunistic pathogen with predisposing factors of?

Advanced age, Immunodeficiency, Neutropenia, Other debilitating diseases

4
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Clinical infections caused by M. Catarrhalis are?

◦Pneumonia

◦Sinusitis

◦Otitis media (3rd most common cause)

5
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VF of M. Catarrhalis?

Endotoxin

Pili

Most isolates produce Beta-lactamase.

6
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A direct smear from an otitis media shows?

showing intracellular gram-negative diplococci

7
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Colony morphology on CHOC

Colonies appear smooth with a grayish- white

8
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Organism will grow on sheep blood agar?

True

9
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When colonies pushed the loop they?

"scoot" across media

10
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Lab Diagnosis of M. Catarrhalis?

Does not grow on Thayer Martin Media.

Oxidase positive

Catarrhalis Disc

◦ Positive= blue-green

All CTA sugars negative

Produce beta- lactamase

11
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Treatment of M. Catarrhalis?

Due to production of beta lactamase. Augmentin (amoxicillin with clavulanic acid) is the drug of choice.