The microbiologist identified an organism that produces large c-hemolytic colonies on blood agar and appears as a gram-variable rod on Gram staining. In order to further identify the organ-ism, the microbiologist should:
a. no further identification is necessary.
b. complete a biochemical panel and antibi-otic sensitivity.
c. complete a biochemical panel, no antibi-otic sensitivity is warranted.
d. report the organism as Bacillus spp.
Reduced O2 (5 to 10) and increased CO2 (8 to 10) produce an environmental condition that best suits which type of organism?
a. Aerobes
b. Anaerobes
c. Capnophiles
d. Microaerophiles
The drugs of choice for most Enterococcal infections are:
a. vancomycin and a penicillin.
b. clindamycin and vancomycin.
c. penicillin and an aminoglycoside.
d. septra.
What morphologic feature is a major consideration in determining an identification scheme for streptococci?
a. Colony shape and color
b. Hemolytic pattern
c. Smell
d. Consistency
Which organism is catalase positive, coagulase negative, pyrrolidonyl arylamidase (PYR) positive, susceptible to novobiocin, urease negative, and hemolytic on sheep blood agar?
a. S. epidermidis
b. S. saprophyticus
c. S. cohnii
d. S. haemolyticus