One hundred and sixty four rectal swab samples were collected from 110 live diarrheic piglets and 54 healthy piglets during an investigation on the prevalence of HPI-harboring Escherichia coli (HPI + E. coli) infection associated with porcine diarrhea. The data of polymerase chain reaction (PCR) revealed the presence of HPI + E. coli in 58.18% of swabs taken from diarrheic piglets, while 44.44% of samples taken from healthy pigs were so positive. Further PCR examination of 600 bacterial isolates from diarrheic samples revealed that 25 isolates were HPI +E. coli while 4 (16%) were F4+, 2 (8%) were F4+ and F6+, 2 (8%) were F4+ and F6+, and one (4%) was F6+, LTa+ and STb+. Among the 480 bacterial isolates from non-diarrheic samples, 20 isolates were HPI + E. coli, and only one (5%) was LTa+ and STb+, while absence of isolates belonging to the F4+ and F6+ groups was noted. O138 was the vast prevalent serotype among the HPI +E. coli isolates. It is suggested that HPI + E. coli maybe an opportunistic pathogen in swine.
Key words: Escherichia coli, HPI, prevalence, piglet.
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