Surveillance of bacterial resistance at Children's Hospital of Chongqing Medical University in 2015 / 中国感染与化疗杂志

ABSTRACT

Objective To investigate the susceptibility and resistance profile of clinical isolates.Methods Clinical isolates were collected from Children's Hospital of Chongqing Medical University from January 1 to December 31,2015.Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were analyzed according to CLSI 2015 breakpoints.Results A total of 13 109 clinical isolates were collected from January to December 2015,of which gram negative organisms and gram positive cocci accounted for 65.3 ％ (8 560/13 109) and 34.7 ％ (4 549/13 109),respectively.Methicillin resistant strains in S.aureus (MRSA) and coagulase negative Staphylococcus (MRCNS) accounted for 29.6 ％ and 67.1％,respectively.Most (93.1％) MRSA strains were still susceptible to trimethoprim-sulfamethoxazole,while 80.2 ％ of MRCNS strains were susceptible to rifampin.No staphylococcal strains were found resistant to vancomycin,teicoplanin or linezolid.The resistance rates of E.faecalis strains to most antibiotics tested (except tetracycline) were much lower than those of E.faecium.Some strains of both species were resistant to vancomycin.No E.faecalis or E.faecium strains were found resistant to vancomycin.The prevalence of ESBLs-producing strains was 55.7 ％ in E.coli and 43.5 ％ in Klebsiella (K.pneumoniae and K.oxytoca) and 11.6 ％ in Proteus mirabilis isolates.ESBLs-producing Enterobacteriaceae strains were more resistant than non-ESBLs-producing strains in terms of antibiotic resistance rates.Enterobacteriaceae strains were still highly susceptible to carbapenems.Overall,less than 16.0 ％ of these strains were resistant to carbapenems.About 10.5 ％ and 9.4 ％ of the A.baumannii strains were resistant to imipenem and meropenem,respectively.Compared to the data of year 2014,the prevalence of extensively-drug resistant P.aeruginosa and K.pneumoniae strains increased.Conclusions The antibiotic resistance of clinical bacterial isolates is growing.The emerging and increasing prevalence of multi-drug or pan-drug resistant strains poses a serious threat to clinical practice and implies the importance of strengthening infection control.