OBJECTIVE To investigate the distribution of mobile resistant determinants(genetic markers of mobile genetic elements and resistant genes)in a group of drug-resistant Escherichia coli(DR-ECO),so as to provide evidence to clinical treatment.METHODS From Jan.to Dec.2015,a total of 32 strains of DR-ECO isolated from inpatients sputum were collected from the hospital.Then,3kinds of mobile genetic elements,16 kinds of beta-lactamase genes were analyzed by polymerase chain reaction(PCR)and sequence analysis metho...