The treatment of gram-negative bacteremia is increasingly complicated by the occurrence of multidrug resistant gram-negative bacilli strains. Normally susceptible bacteria may become resistant to antimicrobial agents through mutation and selection or acquisition from other bacteria of genetic information that encodes resistance. Enterobacterial resistance to third-generation cephalosporins is typically caused by production of extended-spectrum beta-lactamases . CTX-Ms are one of the means of antibiotic resistant marker transfer among members of Enterobacteriaceae. Continous surveillance will...