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Virulence Factors of Avian Pathogenic Escherichia coli Isolated from Broilers from the South of Brazil

2002; American Association of Avian Pathologists; Volume: 46; Issue: 3 Linguagem: Inglês

10.1637/0005-2086(2002)046[0749

1938-4351

Ana Cristina Gonçalves Pinto da Rocha, Ari Bernardes da Silva, Benito Guimarães de Brito, Hamilton Luiz de Souza Moraes, Alexandre Pontes Pontes, Milene C. Cé, Vladimir Pinheiro do Nascimento, Carlos Tadeu Pippi Salle,

Salmonella and Campylobacter epidemiology

Sixty-three Escherichia coli strains isolated from broilers with respiratory problems were examined for virulence factors, hemolysin synthesis ability, motility, hemagglutination capacity, operon pap presence, colicin production, and serum resistance. The capacity to hemagglutinate guinea pig erythrocytes was found in 53 (84.1%) of the samples, but only 30 (47.6%) agglutinated chicken erythrocytes. D-mannose-sensitive hemagglutination against guinea pig erythrocytes was found in 19 (30.2%) samples and against chicken erythrocytes, in 15 (23.8%) samples, whereas the D-mannose-resistant hemagglutination with guinea pig erythrocytes was found in 34 (54%) samples, and 13 of these (20.6%) showed this characteristic against chicken erythrocytes. Operon pap, P fimbria codifier, was detected in 26 samples in a total of 34 D-mannose-resistant samples. Colicin production was observed in 55 (87.3%) of the strains, and 41.8% presented V colicin production. Of the samples analyzed, 56 (88.9%) presented serum resistance, six (9.5%) were intermediate, and only one (1.6%) was sensitive to the action of the complement. The diversity of virulence profiles detected in the samples in this study explains in part the multifactorial characteristics of avian colibacillosis.