M. catarrhalis may be differentiated from gonococci and meningococci on the basis of its:
a. growth on blood agar at 35°C.
b. growth on nutrient agar at 22°C.
c. reduction of nitrite to nitrate.
d. production of DNase.
D
M. catarrhalis may be differentiated from gonococci and meningococci on the basis of its growth on blood agar at 22°C and nutrient agar at 35°C, reduction of nitrate to nitrite, inability to utilize carbohydrates, and production of DNase. M. catarrhalis is the only member of this group of organisms that hydrolyzes DNA.
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