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Journal of Clinical Microbiology, June 1999, p. 1727-1731, Vol. 37, No. 6
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Characterization of Antimicrobial Resistance in Streptococcus pyogenes Isolates from the San Francisco Bay Area of Northern California

Mary K. York,1,* Laurel Gibbs,1 Francoise Perdreau-Remington,2 and G. F. Brooks1

Department of Laboratory Medicine1 and Department of Medicine, Infectious Diseases Division,2 University of California, San Francisco, California

Received 21 August 1998/Returned for modification 17 October 1998/Accepted 23 February 1999

During 1994 and 1995, 157 isolates of Streptococcus pyogenes from patients with invasive disease were consecutively collected in the San Francisco Bay area to determine the frequency of antimicrobial resistance. Susceptibility testing was performed according to the guidelines of the National Committee for Clinical Laboratory Standards by the disk method and by broth microdilution. For comparison of susceptibility patterns, an additional 149 strains were randomly collected from patients with pharyngitis. For San Francisco County, 32% of the isolates from invasive-disease-related specimens but only 9% of the isolates from throat cultures from the same period were resistant to erythromycin (P = 0.0007). Alameda County and Contra Costa County had rates of resistance of <= 10% from isolates from all cultures. When the data were analyzed by hospital, the San Francisco County Hospital had a statistically higher rate of erythromycin resistance (39%) among the strains from serious infections compared to those from other counties (P = <0.0003). For tetracycline, high rates of resistance were observed in San Francisco County for both isolates from patients with invasive disease (34%) and pharyngitis (21%) in the same period. Using pulsed-field gel electrophoresis, two clones, one at the San Francisco County Hospital and a second in the entire area, were identified. The latter clone exhibited resistance to bacitracin. Of 146 strains that were tested by microdilution, all were susceptible to penicillin. Clindamycin resistance was not seen among the erythromycin-susceptible strains, but two of the 39 erythromycin-resistant strains were also resistant to clindamycin. An additional 34 strains showed resistance to clindamycin when exposed to an erythromycin disk in the double-disk diffusion test, suggesting that the mechanism of erythromycin resistance is due to an erm gene. This study demonstrates a high rate of resistance to macrolides and tetracycline among S. pyogenes isolates in San Francisco County and shows that macrolide resistance is more common in strains from patients with invasive disease than in strains from those with pharyngitis.

* Corresponding author. Mailing address: Department of Laboratory Medicine, L 515, Box 0100, University of California, San Francisco, CA 94143. Phone: (415) 476-3233. Fax: (415) 502-0929. E-mail: york{at}labmed.ucsf.edu.

Journal of Clinical Microbiology, June 1999, p. 1727-1731, Vol. 37, No. 6
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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