The differentiation of the similar M. catarrhalis and Neisseria can be best accomplished by:
a. examination of Gram stain of the colony.
b. vancomycin susceptibility testing.
c. the oxidase test.
d. carbohydrate utilization testing.
D
M. catarrhalis may be differentiated from Neisseria on the basis of its growth on blood agar at 22°C and nutrient agar at 35°C, the reduction of nitrate to nitrite, its inability to utilize carbohy-drates, and its production of deoxyribonuclease (DNase). M. catarrhalis is the only member of this group of organisms that hydrolyzes deoxyribonucleic acid (DNA).
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