Determination of serotype and virulence of E. coli strains caused diarrhea in piglets in Cam Pha city, Quang Ninh province

Abstract

The result of investigating epidemic situation, isolation and determination of some biological characteristics of E. coli bacteria causing diarrhea in the piglets under 2 months old in Cam Pha city, Quang Ninh province from 2014 to 2015 showed that the infection and mortality rate of the piglets was relatively high (17.37% and 10.22%, respectively). The rate of fecal and viscera samples from that the E. coli strains were isolated to be 84.53% and 82.22% respectively. The isolated E. coli strains belonged to serotypes: O149, O141, O139, O138, O111 and O8, of which serotype O149 accounted for the highest rate (28.0%) and serotype O8 shared the lowest rate (8.0%). The virulence of E .coli strains was very strong, these bacteria strains killed 100% of the experimental albinic mouse within 18-48 hours.