Drug resistance of Mycobacterium tuberculosis and susceptibility of multidrug-resistant strains to linezolid in 5cities in Hebei Province / 中国感染控制杂志

ABSTRACT

Objective To understand the drug resistance of Mycobacterium tuberculosis(MTB)and susceptibility of multidrug-resistant MTB(MDR-MTB)to linezolid in Hebei Province, so as to guiding clinical treatment of MDR tuberculosis.Methods The isolated strains and clinical information of patients with tuberculosis in 6 hospitals of 5 cities in Hebei Province between January and December 2016 were collected, susceptibility of MTB to antituberculous drugs isoniazid(INH), rifampicin(RFP), streptomycin(SM), ethambutol(EMB), ofloxacin(OFX), and kanamycin(KM)were detected, 100 strains of MDR-MTB were selected by stratified random sampling method, susceptibility to linezolid was detected.Results Drug resistance rate and MDR rate of the initially treated cases were 26.6％(200/753)and 13.5％(102/753)respectively, drug resistance rate and MDR rate of the retreatment cases were 59.7％(132/221)and 53.4(118/221)respectively, drug resistance rate and MDR rate of the retreatment cases were both statistically higher than initially treated cases(χ2=83.7, P＜0.01;χ2=93.5, P＜0.01).Resistance rates of MTB to first-line antituberculous drugs INH, RFP, SM, and EMB were 25.8％, 23.7％, 16.7％, and 7.1％ respectively, to second-line antituberculous drugs OFX and KM were 4.7％(37/782)and 4.0％(31/782)respectively; susceptibility of MDR-MTB to linezolid was 80.8％ (59/73).Conclusion Drug resistance rate and MDR rate of the retreated tuberculosis patients are higher than initially treated patients, linezolid has good in vitro antimicrobial activity against MDR-MTB.