8Zanella A, Alborali G L, Bardotti M, et al. Severe Escherichia coli Olll septicaemia and polyserositis in hens at the start of lay[J]. Avian Pathology, 2000, 29(4):311-317.
9Ewers C, Li G,Wilking H, et al. Avian pathogenic, uropathogenic,and newborn meningitis-causing Esch erichia coli : How closely related are they[J]. Interna- tional Journal of Medical Microbiology, 2007, 297(3):163-176.
10Cho Y I,Kim W I,Liu S,et al. Development of a panel of multiplex real-time polymerase chain reaction as- says for simultaneous detection of major agents cau sing calf diarrhea in feces[J]. J Vet Diagn Invest, 2010,22(4) :509-517.
