A 28-year-old female has delivered a 5 pound male at 32 weeks gestation. A culture of the placenta demonstrates a beta-hemolytic gray-white colony that is catalase negative. This organism will also be
A) CAMP positive. B) sodium hippurate hydrolysis negative.
C) motile at room temperature. D) esculin hydrolysis positive.
Question 2
A 20-year-old female presents with pharyngitis. The rapid group A Streptococcus screen is negative, and a blood agar plate is inoculated. After 24 hours incubation, a tiny gray colony with a narrow zone of beta-hemolysis is observed.
The microbiologist performs a streptococcal serotype for group A and the result is negative. She should
A) repeat the streptococcal serotype after boiling the organism suspension.
B) perform an ELEK test.
C) perform a Gram stain and catalase test.
D) finalize the culture as No Group A Streptococcus isolated.
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