Received: 17-04-2013 / Accepted: 19-06-2013
The contribution of Eschrichia coli (E.coli) and Salmonella spp. to diarrhoea of pre- and post-weaning piglets was investigated in Son Tra industrial farm in Bac Ninh province. The isolation rates for E.coli from fecal samples of pre- and post-weaning diarrheic piglets were 86.2 and 78%, respectively. Serotype O149 comprised the highest percentage (48%) followed by O101 (20%); O64 (12%) and O8 (8%) in isolates from pre-weaning piglets. Among isolates from post-weaning piglets, O141 comprised 43.7%, followed by O139 (28.1%), O149 and O138 (9.3% for each serotype). Genes encoding for STa, STb, LT, F4, and F18 were detected at 32; 44; 24; 44 and 32% in isolates from pre-weaning whereas, from fecal samples of post-weaning piglets, the detection rates was 65.5; 21.8; 59.4; 0 and 34.3%, respectively. The virulence was found higher for isolates from pre-weaning piglets. Salmonella spp. were detected only from fecal samples of post-weaning piglets with lower incidence in comparasion to previous reports and all of the isolates were S.typhimurium with very high virulence. High susceptibility of both E.coli and Salmonella isolates to Apramycin, Cephalothin, Amikacin, Certiofur was observed. Taken together, E.coli seemed to play a dominant role in diarrhoea of pre-weaning piglets in an industrial farm and that can be shared by Salmonella spp. in post-weaning counterparts.