Table 1a.

Comparison of Moraxella catarrhalis with nonhuman primate Moraxella isolates.

	Moraxella catarrhalis	Nonhuman primate Moraxella
Gram reaction	Negative	Negative; resistance to decolorization
Cell morphology	Small (0.6–1.0 μm) cocci	Larger (1.0–1.5 × 1.5–2.5 μm) plump rods
Colony morphology	Round, convex, greyish-white, “hockey puck”	Round, large, mucoid
Hemolysis	No	No
Oxidase	Yes	Yes
Butyrate esterase	Yes	Yes
Acid from simple sugars	No	No
Reduction of nitrate/nitrite	Yes	Yes
Penicillin resistance	Yes	No