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Chinese Journal of Antituberculosis ›› 2018, Vol. 40 ›› Issue (4): 384-391.doi: 10.3969/j.issn.1000-6621.2018.04.008

• Original Articles • Previous Articles     Next Articles

Drug resistance surveillance of Mycobacterium tuberculosis in Southwest China from 2014 to 2015

Ai-jing MA,Xin-fu DUAN,Ping HOU,Yan-lin ZHAO()   

  1. Department of Tuberculosis Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China
  • Received:2018-02-07 Online:2018-04-10 Published:2018-05-14
  • Contact: Yan-lin ZHAO E-mail:zhaoyl@chinacdc.cn

Abstract:

Objective To investigate the drug resistance of pulmonary tuberculosis patients in southwest China through drug resistance surveillance.Methods A total of 610 Mycobacterium tuberculosis (MTB) strains isolated from smear-positive pulmonary tuberculosis patients collected from 8 national drug-resistant surveillance sites in Chongqing, Sichuan and Yunnan Provinces from 2014 to 2015 were analyzed by the drug susceptibility test (DST) of the proportion method for four first-line anti-tuberculosis drugs including Isoniazid (INH), Rifampicin (RFP), Ethambutol (EMB) and Streptomycin (Sm), as well as five second-line anti-tuberculosis drugs including Kanamycin (Km), Ofloxacin (Ofx), Capreomycin (Cm), Protionamide (Pto) and para-aminosalicylic acid (PAS). The total drug-resistance rate, mono-resistance rate, drug resistance spectrum and multi-drug resistance rate (MDR) of MTB were analyzed. The differences in drug resistance rates by different regions and years were also analyzed.Results To the nine anti-tuberculosis drugs, the overall resistance rate and MDR rate were 19.51% (119/610) and 5.74% (35/610), respectively. Drug resistance rates ranked from high to low as INH (11.97%,73/610), Sm (10.66%,65/610), RFP (6.56%, 40/610), Ofx (6.56%, 40/610), PAS (2.62%,16/610), Km (2.13%, 13/610), EMB (1.15%, 7/610), Cm (0.49%, 3/610), and Pto (0.16%, 1/610). Among the 8 monitoring sites in southwest China, the statistical results showed that the highest MDR rate was 16.36% (9/55) in Tongjiang County, Sichuan Province; the highest INH resistance rate was 23.64% (13/55) in Tongjiang County, Sichuan Province; the highest Km resistance rate was 10.91% (6/55) in Tongjiang County, Sichuan Province. There was no significant difference in drug resistance rate (year 2014 (20.08%, 51/254); year 2015 (19.10%, 68/356)) and MDR rate (year 2014 (4.72%, 12/254); year 2015 (6.46%, 23/356)) between different years (χ 2=0.09,P=0.764; χ 2=0.83,P=0.363). Conclusion The drug resistance in southwest China is more severe and the surveillance of drug-resistant TB should be strengthened in this area.

Key words: Mycobacterium tuberculosis, Tuberculosis,multidrug-resistant, Sentinel surveillance, Small-area analysis