Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/27408
Type: Artigo de periódico
Title: Virulence factors of Escherichia coli isolated from calves with diarrhea in Brazil
Title Alternative: Fatores de virulência das amostras de Escherichia coli isoladas de bezerros com diarréia no Brasil
Author: Salvadori, Márcia Regina
Valadares, Geórgio Freesz
Leite, Domingos da Silva
Blanco, Jesús
Yano, Tomomasa
Abstract: Two hundred and five Escherichia coli strains isolated from calves with diarrhea from mid-western Brazil were screened for the presence of virulence factors associated with bovine colibacillosis. One hundred and two (49.8%) of the E. coli strains produced toxins: Shiga toxins 1 (9.7%) and 2 (6.3%), a-hemolysin (9.7%), enterohemolysin(6.8%), Cytotoxic Necrotizing Factors type 1 (0.5%), and type 2 (4.4%), enterotoxins LT-II (8.3%) and STa (3.9%). No strain produced enterotoxin LT-I. Fimbrial adhesins F5 and F17 were produced by 7.3% and 4.8% of the strains, respectivly, and none expressed F41. Seven strains (3.4%) possessed the gene eae and belonged to serotypes O26:H-; O111:H- and O118:H16. These results suggest that calves in Brazil may be an important source of pathogenic E. coli for animals and humans.
Duzentas e cinco amostras de Escherichia coli isoladas de bezerros com diarréia da região centro oeste do Brazil foram examinados quanto a presença de fatores de virulência associados à colibacilose bovina. Cento e duas amostras (49,8%) de E. coli produziram toxinas: toxina de Shiga do tipo 1 (9,7%) e 2 (6,3%), a-hemolisina (9,7%), enterohemolisina (6,8%), Fatores Citotóxicos Necrotisantes tipo 1 (0,5%) e 2 (4,4%), enterotoxinas LT-II (8,3%), e STa (3,9%). Nenhuma amostra produziu enterotoxina LT-I. Adesinas fimbriais F5 e F17 foram produzidas por 7,3% e 4,8% das cepas, respectivamente, e nenhuma expressou F41. Sete das amostras (3,4%) apresentaram o gene eae e pertenceram aos sorotipos O26:H-; O111:H- e O118:H16. Estes resultados sugerem que bezerros no Brasil podem ser uma importante fonte de E. coli patogênica para animais e humanos.
Subject: bezerros
diarréia
E. coli
fatores de virulência
calves
diarrhea
E. coli
virulence factors
Editor: Sociedade Brasileira de Microbiologia
Rights: aberto
Identifier DOI: 10.1590/S1517-83822003000300009
Address: http://dx.doi.org/10.1590/S1517-83822003000300009
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000300009
Date Issue: 1-Jul-2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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