5Nagy B, Fekete P Z.Enterotoxigenic Escherichia coli (ETEC) in farm animals [J].Vet Res, 1999,30 : 259-284.
6Frydendahl K. Prevalence of serogroups and virulence genes in Escherichia coli associated with postweaning diarrhoea and edema disease in pigs and a comparison of diagnostic approaches [J].Vet Microbiol, 2002,85 : 169-182.
7Do T, Stephens C, Townsend K, et al. Rapid identification of virulence genes in enterotoxigenic Escherichia coli isolates associated with diarrhoea in Queensland piggeries [J].Aust Vet J,2005,83 : 293-299.
8Do T N, Cu P H, Nguyen H X, et al. Pathotypes and serogroups of enterotoxigenic Escherichia coli isolated from pre-weaning pigs in North Vietnam [ J ].J Med Microbiol, 2006,55 : 93-99.
9Melin L, Mattsson S, Katouli M. Development of post-weaning diarrhoea in piglets, relation to presence of Escherichia coli strains and rotavirus [J].Vet B Infect Dis Vet Public Health,2004,51(1):12-22.
10PANG Y G, JIANG J Y, WANG L Z, et al. Effects of immunological stress on immune response in different breeds of piglets [J].Animal Husbandry and Feed Science,2009 (2):28-31.
