Moraxella

Question 1

Moraxella catarrhalis- General Characteristics (5)

Answer 1

1- Aerobic Gram-Negative diplococci

2- Grow at 37 degrees on chocolate and blood agar

3- Oxidase positive

4- DNase POSITIVE

5- Commensals in UPPER RESPIRATORY TRACT

Question 2

Moraxella catarrhalis- Clinical Features (3)

Answer 2

Otitis media

Sinusitis

LOWER RESPIRATORY TRACT infections in COPD (especially Elderly)

Question 3

Moraxella catarrhalis- Virulence Factors (3)

Answer 3

1- OUTER MEMBRANE PROTEINS

2- LIPO-OLIGOSACCHARIDE (initial stage of attachment to nasopharynx)

3- PILI