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794 Microbiology

In a completely and adequately immunized child against Diphtheria, the throat swab was collected. It showed the presence of Corynebacterium diphtheriae like organisms on Albe staining. These organisms can have one of the following propeies on fuher laboratory processing

AIt can grow on Potassium tellurite medium
BPositive Elek's gel precipitation test
CIt can be pathogenic to experimental guinea pigs
DIt can produce cytotoxicity in tissue cultures
Microbiology
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799 Microbiology

A patient is hospitalized after an automobile accident. The wounds become infected, and the patient is treated with tobramycin, carbenicillin, and clindamycin. Five days after antibiotic therapy was initiated, the patient develops severe diarrhea and pseudomembranous enterocolitis. Antibiotic-associated diarrhea and the more serious pseudomembranous enterocolitis can be caused by which of the following organisms?

ABacteroides fragilis
BClostridium difficile
CClostridium perfringens
DClostridium sordellii
Microbiology
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