Isolates from CSF that are gram-negative coccobacilli, grow on chocolate agar in CO2 but not blood agar, require factor V but not X, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae.
b. H. influenzae.
c. H. aphrophilus.
d. H. ducreyi.
A
All characteristics listed are those that describe H. parainfluenzae.
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