Investigation of nosocomial infections due to multidrug-resistant,pandrug-resistant Pseudoonas aeruginosa and Acinetobacter baumannii and study on carbapenemases-producing phenotype
10.3969/j.issn.1673-4130.2014.16.010
- VernacularTitle:多重及泛耐药铜绿假单胞菌和鲍曼不动杆菌医院感染调查及产碳青霉烯酶表型研究
- Author:
Yunzhi OU
;
Chunlin LIU
;
Fulang HAN
;
Debing HUANG
;
Youhua GUAN
- Publication Type:Journal Article
- Keywords:
multidrug-resistant;
extensively drug-resistant;
Pseudomonas aeruginosa;
acinetobacter;
carbapenemase
- From:
International Journal of Laboratory Medicine
2014;(16):2144-2146
- CountryChina
- Language:Chinese
-
Abstract:
Objective To understand the nosocomial infection distribution,drug resistance characteristics and carbapenemases-producing phenotype of Pseudomonas aeruginosa (PAE)and Acinetobacter baumannii (ABA).Methods The nosocomial infection strains of non-repeated PAE and ABA isolated in this hospital and the infected cases from July 2012 to July 2013 were retrospec-tively collected.The antimicrobial susceptibility test was conducted by the disk diffusion method(K-B method).The modified Hodge test was adopted to preliminarily screen carbapenemase and the positive strains of preliminary screening were further detected met-allo-beta-lactamase(MBL)by 2-mercaptopropionic acid synergy test.Results During the study period,250 strains of non-repeated PAE and 132 strains of ABA were included.All of them were primarily isolated from sputum specimens,accounting for 55.5%.The department distribution was dominated by the intensive care units(ICU),accounting for 20.9%.The antimicrobial susceptibility test showed that the sensitivity of PAE to the testing anti-microbial drugs was more than 70%,its resistance rates to IPM and MEM were 8.5% and 9.5% respectively.However,the resistance rates of ABA to the testing anti-microbial drugs were up to 35.2%-77.4%,its resistance rates to IPM and MEM were 35.2%,39.1% respectively.The occurrence rates of multidrug-resist-ant and pandrug-resistant ABA nosocomial infection was higher than that of PAE,which were 44.7% and 24.0% and 9.1% and 2.8%,respectively.Among 40 strains of carbapenem-resistant PAE,11 strains(27.5%)were positive in the preliminary screening and 2 strains(18.2%)were positive of MBL phenotype.Among 49 strains of carbapeneme-resistant ABA,37 strains(75.5%)were positive in the preliminary screening and only 1 strain(2.7%)was positive of MBL phenotype.Conclusion PAE and ABA in our hospital exhibit different resistance to common antibacterial drugs.The monitoring should be strengthened.The production of car-bapenemsa is one the main mechanisms for PAE resistance to carbapenems.The detection rate of MBL-producing PAE and ABA is lower in our hospital.
