A cerebrospinal fluid (CSF) culture was performed on a newborn in distress. After overnight incubation, small gram-positive bacilli with a soft zone of <-hemolysis grew on sheep blood agar. Based on this information, what results would be expected on the following tests: hippurate; Christie, Atkins, Munch-Petersen (CAMP); and motility?
a. Negative hippurate, positive CAMP, and negative motility
b. Positive hippurate, negative CAMP, and positive motility
c. Positive hippurate, positive CAMP, and positive motility
d. Negative hippurate, negative CAMP, and negative motility
C
The organism is Listeria monocytogenes and produces positive results for the hippurate, CAMP, and motility tests. Gram-positive bacilli with a soft zone of <-hemolysis are characteristic of L. monocytogenes, along with the above biochemicals.
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