6Chen X,Zhang W Q, Yin J J, et al. Escherichia coil iso- lates from sick chickens in China:Changes in antimicro- bial resistance between 1993 and 2013 [ J]. The Veterina- ry Journal,2014,202(l) :112-115.
7Saif Y M. Diseases of poultry[ M ]. Ames :Iowa State Uni- versity Press ,2008.
8崔志中.兽医免疫学实验指导[M].北京:中国农业出版社,2006.
9王艳丰.河南省鸡大肠杆菌病流行病学调查及病原分离鉴定与耐药性研究[D].郑州:河南农业大学.
10Hall M A, Blok H E, Donders A R, et al. Multidrug re- sistance among Enterobacteriaceae is strongly associated with the presence of integrons and is independent of spe- cies or isolate origin [ J ]. The Journal of Infectious Disease, 2003,187 ( 2 ) : 251-259.
