Results of Treatment of Patients with Multiple Drug Resistant Tuberculosis among Key Populations during the COVID-19 Pandemic in Dushanbe, Tajikistan

The objective: to identify changes in effectiveness of treatment of multiple drug resistant tuberculosis among key populations in Dushanbe, including the period of the COVID-19 pandemic.Subjects and Methods. Retrospective study of medical records of 431 MDR TB patients registered for treatment in Dushanbe was conducted (2017-2019 - Group 1 and 2020-2021 - Group 2 (the COVID-19 pandemic period)).Results. The duration of treatment was 15.4±6.9 months in Group 1, and 10.8±4.3 months in Group 2, which was due to the introduction of short-course regimens in that group. At the same time, in Group 2 there was an increase in effectiveness of MDR TB treatment to 85% versus 80% in Group 1, which was due to the use of new drugs and regimens containing them. In Group 1, a statistically significant association was found between MDR TB treatment failure and the following parameters: male gender (RR=2.3 (1.36-4.04), p=0.002), positive HIV status (RR=2.35 (1.37-4.05), p=0.011), hepatitis C infection (RR=3.0 (1.87-4.8), p <0.001), alcohol (RR=3.2 (1.96-5.2), p<0.001) and substances abuse (RR=3.99 (2.5-6.2), p<0.001), previous imprisonment (RR=2.6 (1.48-4.6), p<0.001), unemployment (RR=3.5 (1.8-6.7), p <0.001), and homelessness (RR=5.0 (3.9-6.5), p=0.0011). In Group 2, failure of MDR TB treatment was statistically significantly associated with hepatitis C (RR=3.3 (1.5-7.2), p=0.02), alcohol and drug abuse (RR= 4.4 ( 1.95-10.1). p =0.026), as well as (unlike Group 1) labor migration (RR=3.0 (1.45-6.2), p=0.0068), in-patient treatment (RR=3.8 (1.36-10.64), p=0.0056), while there was no association with HIV status.