Journal Article

Lessons Learned from the Anaerobe Survey: Historical Perspective and Review of the Most Recent Data (2005–2007)

David R. Snydman, Nilda V. Jacobus, Laura A. McDermott, Yoav Golan, David W. Hecht, Ellie J. C. Goldstein, Lizzie Harrell, Stephen Jenkins, Duane Newton, Carl Pierson, John D. Rihs, Victor L. Yu, Richard Venezia, Sydney M. Finegold, Jon E. Rosenblatt and Sherwood L. Gorbach

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 50, issue Supplement_1, pages S26-S33
Published in print February 2010 | ISSN: 1058-4838
Published online February 2010 | e-ISSN: 1537-6591 | DOI:
Lessons Learned from the Anaerobe Survey: Historical Perspective and Review of the Most Recent Data (2005–2007)

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Background. The rationale and lessons learned through the evolution of the National Survey for the Susceptibility of Bacteroides fragilis Group from its initiation in 1981 through 2007 are reviewed here. The survey was conceived in 1980 to track emerging antimicrobial resistance in Bacteroides species.

Methods. Data from the last 11 years of the survey (1997–2007), including 6574 isolates from 13 medical centers, were analyzed for in vitro antimicrobial resistance to both frequently used and newly developed anti-anaerobic agents. The minimum inhibitory concentrations of the antibiotics were determined using agar dilution in accordance with Clinical and Laboratory Standards Institute recommendations.

Results. The analyses revealed that the carbapenems (imipenem, meropenem, ertapenem, and doripenem) and piperacillin-tazobactam were the most active agents against these pathogens, with resistance rates of 0.9%–2.3%. In the most recent 3 years of the survey (2005–2007), resistance to some agents was shown to depend on the species, such as ampicillin-sulbactam against Bacteroides distasonis (20.6%) and tigecycline against Bacteroides uniformis and Bacteroides eggerthii (∼7%). Very high resistance rates (>50%) were noted for moxifloxacin and trovafloxacin, particularly against Bacteroides vulgatus. During that period of study, non-B. fragilis Bacteroides species had >40% resistance to clindamycin. Metronidazole-resistant Bacteroides strains were also first reported during that period.

Conclusions. In summary, resistance to antibiotics was greater among non-B. fragilis Bacteroides species than among B. fragilis and was especially greater among species with a low frequency of isolation, such as Bacteroides caccae and B. uniformis. The emergence of resistance among the non-B. fragilis Bacteroides species underscores the need for speciation of B. fragilis group isolates and for clinicians to be aware of associations between species and drug resistance.

Journal Article.  3424 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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