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Journal of Clinical Microbiology, November 2002, p. 4349-4352, Vol. 40, No. 11
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.11.4349-4352.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

In Vitro Susceptibilities of the Bacteroides fragilis Group Species: Change in Isolation Rates Significantly Affects Overall Susceptibility Data

Department of Medicine (Infectious Diseases), Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112

Received 15 April 2002/ Returned for modification 29 May 2002/ Accepted 19 August 2002

A comparison of antimicrobial susceptibility data of species of the Bacteroides fragilis group for 1989-1990 and 1998-1999 studies showed statistically significant increases or decreases in in vitro activity. Overall significant increases in resistance were noted for ampicillin-sulbactam and clindamycin, while significant decreases in resistance were noted for ertapenem and cefoxitin. Susceptibilities to piperacillin-tazobactam, imipenem, meropenem, and trovafloxacin remained virtually the same for the two studies. Importantly, a change in the rates of isolation of the various species showed the B. fragilis species comprised 58% of the isolates in 1989 to 1990 and 45% of the isolates in 1998 to 1999. This change in rates of isolation of B. fragilis versus non-B. fragilis species had an overall effect on susceptibility data.

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