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Antimicrobial Agents and Chemotherapy, January 2005, p. 97-103, Vol. 49, No. 1
0066-4804/05/$08.00+0     doi:10.1128/AAC.49.1.97-103.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Distribution of Antimicrobial Resistance and Virulence-Related Genes among Brazilian Group B Streptococci Recovered from Bovine and Human Sources

Rafael S. Duarte,1 Bruna C. Bellei,1 Otávio P. Miranda,1 Maria A. V. P. Brito,2 and Lúcia M. Teixeira1*

Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro,1 Empresa Brasileira de Agropecuária (Embrapa), Juiz de Fora, Minas Gerais, Brazil2

Received 25 February 2004/ Returned for modification 8 May 2004/ Accepted 19 September 2004

In the present report we describe the characteristics of 189 antimicrobial-resistant Streptococcus agalactiae isolates from bovine (38 isolates) and human (151 isolates) sources. All the strains were resistant to tetracycline (TET), and 16 (8.5%) were also resistant to erythromycin, corresponding to 23.7% of the TET-resistant bovine isolates and 4.6% of the TET-resistant human isolates. The tet(O), erm(B), and mreA resistance-related genes, as well as the bca and scpB virulence-related genes, were the most frequent among the bovine isolates, while the tet(M), erm(A), mreA, bca, lmb, and scpB genes were the most prevalent among the isolates from humans. Although a few major clusters were observed, pulsed-field gel electrophoresis results revealed a variety of profiles, reflecting the substantial genetic diversity among strains of this species isolated from either humans or bovines.

* Corresponding author. Mailing address: Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, CCS, Bloco I, Cidade Universitária, Rio de Janeiro, RJ 21941-590, Brazil. Phone: 55 21 2260 4193. Fax: 55 21 2560 8344. E-mail: lmt2{at}micro.ufrj.br.

Antimicrobial Agents and Chemotherapy, January 2005, p. 97-103, Vol. 49, No. 1
0066-4804/05/$08.00+0     doi:10.1128/AAC.49.1.97-103.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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