6Sidjabat H E, Townsend K M, Hanson N D, et al. Identification of blaCMY- 7 and associated plasmid mediated resistance genes in multidrug - resistant Escherichia coli isolated from dogs at a veterinary teaching hospital in Australia [ J ]. J Antimicrob Chemother, 2006, 57 : 840 - 848.
7Hopkins K L, DaviesR H, Threlfall E J. Mechanisms of quinolone resistance in Escherichia coli and Salmonella: recent develop- ments[J]. Int J Antimicrob Agents, 2005, 25(5) : 358 -373.
8Philippon A, Arlet G. Beta- lactamases of gram negative bacteria: Never - ending clock work [ J ]. Ann Biol Clin ( Paris ), 2006, 64 (1) : 37 -51.
9Asai T, Kojima A, Harada K, et al . Correlation between the usage volume of veterinary therapeutic antimicrobials and resistance in Escherichia coli isolated from the feces of food - producing animals in Japan [ J]. Jpn J Infect Dis, 2005, 58 (6) : 369 - 372.
10Memish Z A, Venkatesh S, Shibl A M. Impact of travel on inter- national spread of antimicrobial resistance [ J ]. Int J Antimicrob Agents; 2003, 21(2) : 135 -142.