5Rahal I J,Wrban B,Horn D,et al.Classrestriction of cephalosporin use to control total cephalosporin resistance in nosoconnial klebsiella[J].JAMA,1998,280(41):1233.
6Gruson D,Hilbert G,Vargas F,et al.Strategy of antibiotic rotation:longterm effect on incidence and susceptibilities of Gram-negative bacilli responsible for ventilator-associated pneumonia[J].Grit Care Med,2003,31(7):1908.
7Seppala H,Klaukka T,Vuopio-Varkila J,et al.The effect of changes in the consumption of macrolide antibiotics on erythromycin resistance in group A streptococci in Finland.Finnish Study Group for Antimicrobial Resistance[J].N EnglJ Med,1997,337:441.
