Abstract
This study was conducted to determine the prevalence and characteristics of pathogenic Escherichia coli strains from diarrhoeic calves in Iran. A total of 156 E. coli isolates obtained from 180 diarrhoeic calves were evaluated with two multiplex PCR protocols for the detection of the K99, F41, Sta, Stx1, Stx2 and eaeA genes. Of these 156 isolates, 32 (20.5%) carried at least one virulent gene, 22 (14.1%) possessed enterotoxigenic E. coli (ETEC) virulent genes and 10 (6.4%) possessed shiga toxin genes, virulence factors of shiga toxin-producing E. coli (STEC). None of the isolates carried eaeA gene. All ETEC but one were isolated from 1- to 4-day-old calves (95.4%), and one was isolated from a 6-day-old calf. All STEC were isolated from 7- to 28-day-old calves. All ETEC carried both K99 and F41 fimbriae and possessed Sta enterotoxin gene.
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