Poblational and biochemical-structural analyses on CTX-M β-lactamases harboring the D240G mutation reveal that E. coli populations with decreased susceptibility to ceftazidime preexist under a multifactorial resistance profile. (December 2016) - Ghiglione, B.; Rodríguez, M.M.; Brunetti, F.; Dropa, M.; Curto, L.; Power, P.; Gutkind, G.