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Journal of Clinical Microbiology, December 1998, p. 3609-3613, Vol. 36, No. 12
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Adherence Patterns and Adherence-Related DNA Sequences in Escherichia coli Isolates from Children with and without Diarrhea in São Paulo City, Brazil

Tânia A. T. Gomes,1,* Mônica A. M. Vieira,1 Cecilia M. Abe,1 Daleth Rodrigues,2 Patricia M. Griffin,3 and Sônia R. T. S. Ramos2

Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, S.P., Brazil, CEP 04023-0621; Instituto da Criança, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, S.P., Brazil, CEP 05403-9002; and Foodborne and Diarrheal Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia 303333

Received 8 June 1998/Returned for modification 23 July 1998/Accepted 21 September 1998

The correlation between various adherence patterns and adherence-related DNA sequences in Escherichia coli isolates from 1- to 4-year-old children with and without diarrhea in São Paulo, Brazil, was evaluated. A total of 1,801 isolates obtained from 200 patients and 200 age-matched controls were studied. The adherence patterns found were classified as diffuse, aggregative, aggregative in a 6-h assay, aggregative predominantly in coverslips, localized, localized-like, and noncharacteristic. In general, the DNA sequences used as probes showed excellent specificities (>93%), but their sensitivities varied. Thus, the results of bioassays and assays with DNA probes normally used to search for adherent E. coli did not correlate well, and the best method for the identification of these organisms in the clinical research setting remains controversial. Isolates presenting diffuse adherence or hybridizing with the related daaC probe, or both, were by far the most frequent in patients (31.5, 26.0, and 23.0%, respectively), followed by isolates presenting aggregative adherence or hybridizing with the related EAEC probe, or both (21.5, 13.0, and 10.5%, respectively). None of the different combinations of adherence patterns and adherence-related DNA sequences found were associated with acute diarrhea.

* Corresponding author. Mailing address: Departamento de Microbiologia, Immunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medecina, Rua Botucatu 862, 3° Andar, São Paulo, S.P., Brazil, CEP 04023-062. Phone: 055-011-5084-3213. Fax: 055-011-571-6504. E-mail: tatgomes.dmip{at}epm.br.

Journal of Clinical Microbiology, December 1998, p. 3609-3613, Vol. 36, No. 12
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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