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Journal of Clinical Microbiology, February 2004, p. 903-905, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.903-905.2004
Copyright © 2004, American Society of Microbiology. All Rights Reserved.

Virulence Properties and Characteristics of Shiga Toxin-Producing Escherichia coli in São Paulo, Brazil, from 1976 through 1999

T. M. I. Vaz,1 K. Irino,1 M. A. M. F. Kato,1 Â. M. G. Dias,1 T. A. T. Gomes,2 M. I. C. Medeiros,3 M. M. M. Rocha,4 and B. E. C. Guth2*

Instituto Adolfo Lutz,1 Universidade Federal de São Paulo—Escola Paulista de Medicina, São Paulo ,2 Instituto Adolfo Lutz, Ribeirão Preto,3 Instituto Adolfo Lutz, Campinas, Brazil4

Received 4 July 2003/ Returned for modification 22 September 2003/ Accepted 4 November 2003

Twenty-nine Shiga toxin-producing Escherichia coli (STEC) strains were identified in a collection of 2,607 isolates from patients with diarrhea in São Paulo, Brazil, from 1976 to 1999. The STEC strains belonged mainly to serotypes O111:HNM (HNM, nonmotile) (13 of 29 [44.8%]), O111:H8 (7 of 29 [24%]), and O26:H11 (4 of 29 [13.8%]); stx1 eae (26 of 29 [89.6%]), in combination with either enterohemorrhagic E. coli hlyA (11 of 26 [42%]) or astA (24 of 26 [92.3%]), prevailed. The O111 STEC strains were distinguished by their inability to decarboxylate lysine. The predominance of STEC O111 and O26 since the late 1970s and the identification of STEC serotypes O55:H19, O93:H19, and O118:H16 in association with human infections in Brazil are described for the first time.

* Corresponding author. Mailing address: Disciplina de Microbiologia, Universidade Federal de São Paulo, Rua Botucatu 862/3 andar, CEP 04023-062, São Paulo, SP, Brazil. Phone: 55-11-5576-4537. Fax: 55-11-5571-1095. E-mail: becguth{at}ecb.epm.br.

Journal of Clinical Microbiology, February 2004, p. 903-905, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.903-905.2004
Copyright © 2004, American Society of Microbiology. All Rights Reserved.



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