5Svennerholm A M, Tobias J. Vaccines against enterotoxigenic Escherichia coil [J]. Expert Rev Vaccines, 2008, 7(6): 795-804.
6Sizemore D R, Roland K L, Ryan U S. Enterotoxigenic Escherichia coil virulence factors and vaccine approaches [J]. Expert Rev Vaccines, 2004, 3(5): 585-595.
7Usein C R, Damian M. Uropathogenic Escherichia coli-ExPEC pathotype, the best characterized [J]. Bacteriol Virusol Parazitol Epidemiol, 2003, 48(1): 31-36.
8Andersen P H. Bovine endotoxicosis-some aspects of relevance to production diseases [J]. Acta Vet Scand Suppl, 2003, 98: 141-155.
9Colin W D, lsbbel J H, Melanic J R, et al. Nucleotide sequences of four variants of the K88 gene of porcine enterotoxigenie Escherichia coli [J]. Intbc lmmun, 1985, 50(1): 279-283.
10Baecker P A, Shelton E R, Bursztyn-Pettegrew H, et al. Expression of K99 adhesion antigen controlled by the Escherichia coil tryptophan operon promoter [J]. Infect Immun, 1988, 56 (9): 2317-2323.
