8Lee J C, Oh J Y, Cho J W, et al. The prevalence of trimethoprim-resistance-conferring dihydrofolate reductase genes in urinary isolates of Escherichia coli in Korea [J]. J Antimicrob Chemother,2001,47 (5):599-604.
9Lindstedt B A, Heir E, Nygard I, et al. Characterization of class Ⅰ integrons in clinical strains of Salmonella enterica subsp, enterica serovars Typhimurium and Enteritidis from Norwegian hospitals [J]. J Med Microbiol,2003,52 (Pt 2):141-149.
10Cabrera R, Ruiz J, Marco F, et al. Mechanism of resistance to several antimicrobial agents in Salmonella clinical isolates causing traveler's diarrhea [J]. Antimicrob Agents Chemother, 2004,48 (10): 3934-3939.
