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Journal of Clinical Microbiology, July 2008, p. 2432-2434, Vol. 46, No. 7
0095-1137/08/$08.00+0     doi:10.1128/JCM.00013-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Is the Incidence of Anaerobic Bacteremia Decreasing? Analysis of 114,000 Blood Cultures over a Ten-Year Period{triangledown}

Lukas Fenner,1 Andreas F. Widmer,2 Clarisse Straub,1 and Reno Frei1*

Microbiology Laboratory,1 Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland2

Received 4 January 2008/ Returned for modification 7 March 2008/ Accepted 17 April 2008

The number of positive anaerobic blood culture results per 1,000 blood cultures performed decreased from 12.6 in the period from 1997 to 2001 to 7.0 in the period from 2002 to 2006 (P < 0.001), as did the proportion of isolated anaerobic organisms compared to the number of all organisms isolated from blood cultures (7.6% to 4.3% [P < 0.001]), while positive aerobic cultures remained stable. In contrast, the proportion of Bacteroides fragilis group members and gram-positive cocci within the anaerobic group increased (26.8% to 36.7% [P = 0.004] and 5.4% to 12% [P < 0.001], respectively). The number of patients with anaerobic bacteremia decreased from 122 patients in 1997 to 69 in 2006.

* Corresponding author. Mailing address: Microbiology Laboratory, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland. Phone: 41 61 265 42 44. Fax: 41 61 265 53 55. E-mail: rfrei{at}uhbs.ch

{triangledown} Published ahead of print on 7 May 2008.

Journal of Clinical Microbiology, July 2008, p. 2432-2434, Vol. 46, No. 7
0095-1137/08/$08.00+0     doi:10.1128/JCM.00013-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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