A lumbar puncture is performed on an 82 year old woman who i…
A lumbar puncture is performed on an 82 year old woman who is receiving immunosupressive therapy. The direct Gram’s stain of the CSF reveals small gram positive rods and numerous WBCs. At 18 hours, small translucent colonies with narrow zone of beta hemolysis grow on sheep blood agar. The isolate produces catalase. The identification of this isolate could be made by demonstation of:
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