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.

Biology & Microbiology

You might also like to view...

All of the following occur in both DNA and RNA EXCEPT

a. four nitrogenous bases. b. a phosphate–sugar backbone. c. a double-stranded molecule. d. All of these are found in both DNA and RNA

Biology & Microbiology

What condition may occur in a zygote if a sperm has nondisjunction of the sex chromosomes?

a. cancer b. down's syndrome c. klinefelter's syndrome d. triple x syndrome

Biology & Microbiology

What key factor limits the number of trophic levels in an ecosystem?

a. maximum solar radiation b. energy loss c. herbivore size d. predator size e. climate

Biology & Microbiology

Which of the following statements is TRUE?

A) Heroin binds to endorphin receptors. B) Caffeine increases the effects of neurotransmitters that normally suppress nerve signals. C) Alcohol is a stimulant. D) Nicotine is a depressant.

Biology & Microbiology