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J Clin Microbiol. 1984 June; 19(6): 915-916

Evaluation of the 24-h API 20A anaerobe system for identification of Clostridium difficile.

ABSTRACT

Accurate identification of Clostridium difficile is important when antibiotic-associated diarrhea or pseudomembranous colitis is suspected. Presumptive identification of C. difficile was made on the basis of microscopic features and colony characteristics on cycloserine, cefoxitin, fructose, and egg yolk agar medium. We studied the reliability of the 24-h API 20A anaerobe system for definitive identification of C. difficile. This system showed low dependability after the recommended 24 h of incubation by confirming the identity of only 54% of the isolates presumptively identified as C. difficile. There was a marked improvement in the system's capability after 48 h of incubation, when the identity of 95% of the isolates was confirmed.

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