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| Drug resistance surveillance in Mycobacterium tuberculosis in Jiaxing City |
| WANG Yuanhang, HU Jie, GE Rui, FU Xiaofei, QI Yunpeng
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| Department of Communicable Disease Control and Prevention, Jiaxing Center for Disease Control and Prevention, Jiaxing, Zhejiang 314050, China |
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Abstract Objective To investigate the resistance of Mycobacterium tuberculosis to first-line anti-tuberculosis drugs in Jiaxing City, Zhejiang Province from 2017 to 2019, so as to provide insights into improvements of the therapeutic effect of pulmonary tuberculosis. Methods Data pertaining to pulmonary tuberculosis in Jiaxing City from 2017 to 2019 were collected from the Tuberculosis Surveillance System of Chinese Disease Prevention and Control Information System, including demographics, treatment classification, sputum culture and drug resistance. The spectrum, types and prevalence of drug resistance in M. tuberculosis to four first-line tuberculosis drugs, including isoniazid (INH), rifampicin (RFP), streptomycin (SM) and ethambutol (EMB), was analyzed using a descriptive epidemiological method. Results A total of 1 310 M. tuberculosis isolates were cultured from pulmonary tuberculosis patients in Jiaxing City from 2017 to 2019, and there were 259 M. tuberculosis isolates that were resistant to anti-tuberculosis drugs, with an overall drug resistance rate of 19.77%. The prevalence rates of drug resistance to INH, SM, RFP and EMB were 13.36%, 11.83%, 5.50% and 3.59%, respectively. The prevalence of drug resistance was lower in M. tuberculosis isolates from treatment-naïve patients than from retreated patients (18.45% vs. 34.58%, P<0.05). M. tuberculosis isolates presented high resistance to SM (4.50%) and INH alone (4.35%), the highest resistance to INH-SM combinations (3.28%), and the highest resistance to INH+RFP+SM combinations (1.83%). Sixteen isolates were resistant to all the four drugs, with a drug resistance rate of 1.22%. The proportions of resistance to a single drug, RFP resistance, multidrug resistance and resistance to two and more drugs were 10.31%, 5.50%, 4.73% and 4.73%, respectively. In addition, the prevalence of RFP resistance among all patients and treatment-naïve patients both showed a tendency towards a rise from 2017 to 2019 (P<0.05). The prevalence of RFP resistance (7.01% vs. 3.76%) and resistance to two and more drugs (6.01% vs. 3.25%) was both higher among interprovincial mobile tuberculosis patients than among local non-mobile patients (P<0.05). Conclusions The overall prevalence of drug resistance was lower in M. tuberculosis isolates in Jiaxing City from 2017 to 2019 than in Zhejiang Province, with INH and RFP resistance as predominant types.
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Received: 01 June 2023
Revised: 27 July 2023
Published: 17 August 2023
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