Surveillance of bacterial resistance in Yongzhou Central Hospital of Hunan in 2016 and 2017 / 中国感染与化疗杂志

ABSTRACT

Objective To investigate the susceptibility and resistance profile of clinical isolates in Hunan Yongzhou Hospital during 2016 and 2017. Methods Antimicrobial susceptibility testing was carried out according to a unified protocol using KirbyBauer method or automated systems. Results were analyzed according to CLSI 2016 breakpoints. Results A total of 6 354 clinical isolates were collected from January 2016 to December 2017, of which 4 876(76.7％)were gram-negative bacteria, and 1 478(23.3％)were gram-positive bacteria. The top five bacterial species were Escherichia coli(33.0％), Klebsiella(17.0％), Staphylococcus aureus(9.6％), Acinetobacter(8.6％), and Pseudomonas aeruginosa(7.4％). The prevalence of methicillin-resistant Staphylococcus aureus(MRSA)was 33.8％, and prevalence of methicillin-resistant coagulase negative Staphylococcus(MRCNS)was 76.2％. The resistance rates of methicillin resistant strains(MRSA and MRCNS)to most of the tested drugs were significantly higher than those of methicillin sensitive strains(MSSA and MSCNS). No vancomycin or linezolid resistant staphylococci were identified. The resistance rate of Enterococcus faecium to most antimicrobial agents was significantly lower than that of Enterococcus faecium. No enterococcal isolate was resistant to vancomycin or linezolid. The non-meningitis S. pneumoniae strains isolated from children showed slightly higher resistance rate to penicillin(20.8％)than the strains isolated from adults(13.3％). The prevalence of extended spectrum beta-lactamases(ESBLs)in Escherichia coli and Klebsiella pneumoniae was 48.0％ and 35.7％, respectively. Most Enterobacteriaceae strains were highly sensitive to carbapenem antibiotics, showing lower resistancerate(<4％). The prevalence of carbapenem-resistant Klebsiella pneumoniae was 18.8％, and the prevalence of carbapenem-resistant E. cloacae was 14.5％. The prevalence of Acinetobacter baumannii strain resistant to imipenem and meropenem was 76.4％ and 78.6％, respectively. Conclusions Bacterial resistance is still serious. It is necessary to strengthen the monitoring of bacterial resistance, infection control, and rational use of antibiotics.