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. 2005 Jun;49(6):2561-4.
doi: 10.1128/AAC.49.6.2561-2564.2005.

Decreasing prevalence of beta-lactamase production among respiratory tract isolates of Haemophilus influenzae in the United States

Kris P Heilmann  1 , Cassie L Rice, Ashley L Miller, Norma J Miller, Susan E Beekmann, Michael A Pfaller, Sandra S Richter, Gary V Doern
Affiliations

Decreasing prevalence of beta-lactamase production among respiratory tract isolates of Haemophilus influenzae in the United States

Kris P Heilmann et al. Antimicrob Agents Chemother. 2005 Jun.

Abstract

A total of 986 isolates of Haemophilus influenzae from patients with respiratory tract infections in 45 United States medical centers were characterized during the winter of 2002-2003. beta-Lactamase production was noted with 26.2% of isolates; 14.6% were resistant to trimethoprim-sulfamethoxazole. Resistance to other relevant antimicrobial agents was extremely uncommon. In comparison to the results of four previous national surveys conducted since 1994, the prevalence of beta-lactamase production with this pathogen appears to be decreasing.

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