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Year 2015 - Volume 35, Number 9
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Detection of virulence factors and antimicrobial resistance patterns in Shiga toxin-producing Escherichia coli isolates from sheep, 35(9):775-780
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ABSTRACT.- Ferreira M.R.A., Silva T.S., Stella A.E., Conceição F.R., Reis E.F. & Moreira C.N. 2015. Detection of virulence factors and antimicrobial resistance patterns in Shiga toxin-producing Escherichia coli isolates from sheep. Pesquisa Veterinária Brasileira 35(9):775-780. Departamento de Medicina Veterinária, Universidade Federal de Goiás, Regional Jataí, Rodovia BR-364 Km 192 nº3.800, Parque Industrial, Cx. Postal 3, Jataí GO 75801-615, Brazil. E-mail: cissanm@yahoo.com.br
In order to detect virulence factors in Shiga toxin-producing Escherichia coli (STEC) isolates and investigate the antimicrobial resistance profile, rectal swabs were collected from healthy sheep of the races Santa Inês and Dorper. Of the 115 E. coli isolates obtained, 78.3% (90/115) were characterized as STEC, of which 52.2% (47/90) carried stx1 gene, 33.3% (30/90) stx2 and 14.5% (13/90) both genes. In search of virulence factors, 47.7% and 32.2% of the isolates carried the genes saa and cnf1. According to the analysis of the antimicrobial resistance profile, 83.3% (75/90) were resistant to at least one of the antibiotics tested. In phylogenetic classification grouped 24.4% (22/90) in group D (pathogenic), 32.2% (29/90) in group B1 (commensal) and 43.3% (39/90) in group A (commensal). The presence of several virulence factors as well as the high number of multiresistant isolates found in this study support the statement that sheep are potential carriers of pathogens threatening public health. |
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