2006
DOI: 10.1590/s0102-09352006000300003
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Virulence factors of Escherichia coli isolated from diarrheic calves

Abstract: One hundred seventy-three Escherichia coli strains isolated from calves from northwestern São Paulo State, having diarrhea were examined for the production of thermolabile (LT) and thermostable (ST) enterotoxins and for the presence of virulence factors associated with bovine colibacillosis. Eighty-five (49.1%) of the E.coli strains produced toxins; 53 isolates were detected as producing STa toxin, and 9 also produced LT toxin. By PCR, 23 isolates were shown to harbor only the LT-II gene. Nine (5.2%) isolates … Show more

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Cited by 28 publications
(38 citation statements)
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“…In the present study, high levels of resistance as well as MDR were detected among the isolates agreeing with other reports from Brazil (Lira et al, 2004;Rigobelo et al, 2006), all of them showing resistance predominantly to cephalothin, tetracycline, streptomycin, and less frequently to nalidixic acid. These findings agree with data from previous studies showing that resistance is common among strains isolated from food, animals, and humans (Sáenz et al, 2001;Schroeder et al, 2002).…”
Section: Resultssupporting
confidence: 93%
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“…In the present study, high levels of resistance as well as MDR were detected among the isolates agreeing with other reports from Brazil (Lira et al, 2004;Rigobelo et al, 2006), all of them showing resistance predominantly to cephalothin, tetracycline, streptomycin, and less frequently to nalidixic acid. These findings agree with data from previous studies showing that resistance is common among strains isolated from food, animals, and humans (Sáenz et al, 2001;Schroeder et al, 2002).…”
Section: Resultssupporting
confidence: 93%
“…The low level of STEC strains detected as contaminants in the carcass, in this study, contrasts with the high number of these strains detected in feces of healthy or diarrheic cattle in Brazil (Irino et al, 2005;Rigobelo et al, 2006;Aidar-Ugrinovich et al, 2007) what could suggest a efficient work during removal of the hide or the gastrointestinal tracts during slaughtering.…”
Section: Resultscontrasting
confidence: 73%
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“…Porém os resultados entre os estudos divergem, devido a diversos fatores como a região geográfica estudada, época do ano, número de animais e método de diagnóstico empregado. A frequência de ETEC varia desde zero até 30% (Lage et al 1993, Mendonça et al 1996, Langoni et al 2004, Rigobelo et al 2006, Oliveira Filho et al 2007, Coura 2011, Moura et al 2012, Andrade et al 2012. EPEC varia desde 1,42% até 42,5% (Rigobelo et al 2006, Aidar-Ugrinovoch et al 2007, Coura 2011, Moura et al 2012, Andrade et al 2012 e STEC e EHEC varia entre 2,7% até mais de 50% (Rigobelo et al 2006, Aidar-Ugrinovoch et al 2007, Coura 2011, Andrade et al 2012.…”
Section: Estudos Epidemiológicos Brasilunclassified