Disinfectant-resistant Gene of qacE△1 and Molecular Epidemiology in Stenotrophomonas maltophilia

OBJECTIVE To find out the clinical characteristics of nosocomial infections with Stenotrophomonas maltophilia(SMA) and investigate the disinfectant resistant gene of qacE△1,improve the diagnosis and decrease of nosocomial infection cases.METHODS Toally 165 strains of SMA were clinically isolated from 2004 to 2007.The gene of qacE△1 was analyzed by polymerase chain reation(PCR) and homology of the strains was analyzed by the method of by pulsed field gel electrophoresis(PFGE) genotype.RESULTS Susceptible factors were old age,seriousness of underlying disease,prolonged hospitalization and invasive operation with infection of SMA.The lower respiratory tract infection was mostly common with SMA,rate of which was 87.9%.Antibiotic sensitive rate more than 80% against SMA was minocycline,trimethoprim-sulfamethoxazole and levofloxacin.The positive rate of gene qacE△1 was 13.3% in 60 strains tested.Two genotypes in SMA strains from respiratory ICU(RICU) were with the same clone.This result proved that clone transmission occurred in RICU.CONCLUSIONS SMA is an important nosocomial infection pathogen.With the multi-drug resistance,the therapy of infection with SMA is very hard in clinic.As result of gene of qacE△1 and the same clone transmission,clinicians should play an important role of surveillance of effect of disinfection.