antibiotique (2) hôpital (2) gène (2) Methods (2) Patients (2) Escherichia coli (2) Cephalosporins (2) Methods (2) Patients (2) résistance (2) matériau (1) champ (1) diffusion (1) investigation (1) Mexique (1) Causative (1) Treatment (1) Children (1) Specimens (1) Phenotype (1) Polymerase chain reaction (1) Serratia marcescens (1) Klebsiella pneumoniae (1) Quinolone antibacterial agents (1) Specimens (1) Gel electrophoresis (1) Urinary tract infections (1) Septicemia (1) Plasmids (1) Pediatrics (1)