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J Med Microbiol 58 (2009), 222-227; DOI: 10.1099/jmm.0.001560-0
© 2009 Society for General Microbiology
ISSN 0022-2615

Prevalence of erythromycin and clindamycin resistance among clinical isolates of the Streptococcus anginosus group in Germany

Nadine Asmah1, Bettina Eberspächer2, Thomas Regnath3 and Mardjan Arvand4

1 Hygiene Institut, Universität Heidelberg, Heidelberg, Germany

2 Institut für Laboratoriumsdiagnostik, Abt. Mikrobiologie, Vivantes Kliniken, Berlin, Germany

3 Labor Enders und Partner, Medizinisch-diagnostisches Gemeinschaftslabor, Stuttgart, Germany

4 Institut für Medizinische Mikrobiologie, Virologie und Hygiene, Universität Rostock, 18057 Rostock, Germany

Correspondence
Mardjan Arvand
marvand{at}freenet.de

Received February 28, 2008
Accepted October 14, 2008

Members of the Streptococcus anginosus group (SAG) are frequently involved in pyogenic infections in humans. In the present study, the antimicrobial susceptibility of 141 clinical SAG isolates to six antimicrobial agents was analysed by agar dilution. All isolates were susceptible to penicillin, cefotaxime and vancomycin. However, 12.8 % displayed increased MIC values (0.12 mg l–1) for penicillin. Resistance to erythromycin was detected in eight (5.7 %) isolates. Characterization of the erythromycin-resistant isolates with the double-disc diffusion test revealed Macrolide-Lincosamide-StreptograminB and M-type resistance in six and two isolates, respectively. The erythromycin-resistant isolates were further characterized by PCR for the resistance genes ermA, ermB and mefA. Resistance and intermediate resistance to ciprofloxacin were detected in two and six isolates, respectively. Molecular typing by PFGE revealed a high genetic heterogeneity among the SAG isolates and no evidence for a clonal relationship between the erythromycin-resistant isolates. Our data show that resistance to erythromycin, clindamycin and ciprofloxacin has emerged among SAG isolates in Germany. The implications of these findings for susceptibility testing and antimicrobial therapy of SAG infections are discussed.

Abbreviations: MLSB, Macrolide-Lincosamide-StreptograminB; SAG, Streptococcus anginosus group; UPGMA, unweighted pair group method with arithmetic averages.






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