Modelling the effect of short-course multidrug-resistant tuberculosis treatment in Karakalpakstan, UzbekistanReport as inadecuate




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BMC Medicine

, 14:187

World TB Day 2016

Abstract

BackgroundMultidrug-resistant tuberculosis MDR-TB is a major threat to global TB control. MDR-TB treatment regimens typically have a high pill burden, last 20 months or more and often lead to unsatisfactory outcomes. A 9–11 month regimen with seven antibiotics has shown high success rates among selected MDR-TB patients in different settings and is conditionally recommended by the World Health Organization.

MethodsWe construct a transmission-dynamic model of TB to estimate the likely impact of a shorter MDR-TB regimen when applied in a low HIV prevalence region of Uzbekistan Karakalpakstan with high rates of drug resistance, good access to diagnostics and a well-established community-based MDR-TB treatment programme providing treatment to around 400 patients. The model incorporates acquisition of additional drug resistance and incorrect regimen assignment. It is calibrated to local epidemiology and used to compare the impact of shorter treatment against four alternative programmatic interventions.

ResultsBased on empirical outcomes among MDR-TB patients and assuming no improvement in treatment success rates, the shorter regimen reduced MDR-TB incidence from 15.2 to 9.7 cases per 100,000 population per year and MDR-TB mortality from 3.0 to 1.7 deaths per 100,000 per year, achieving comparable or greater gains than the alternative interventions. No significant increase in the burden of higher levels of resistance was predicted. Effects are probably conservative given that the regimen is likely to improve success rates.

ConclusionsIn addition to benefits to individual patients, we find that shorter MDR-TB treatment regimens also have the potential to reduce transmission of resistant strains. These findings are in the epidemiological setting of treatment availability being an important bottleneck due to high numbers of patients being eligible for treatment, and may differ in other contexts. The high proportion of MDR-TB with additional antibiotic resistance simulated was not exacerbated by programmatic responses and greater gains may be possible in contexts where the regimen is more widely applicable.

KeywordsTuberculosis Epidemiology Treatment Modelling Multidrug-resistant tuberculosis Extensively drug-resistant tuberculosis Public health Uzbekistan AbbreviationsDS-TBDrug-susceptible tuberculosis

MDR-TBMultidrug-resistant tuberculosis

MSFMédecins sans Frontières

TBTuberculosis

WHOWorld Health Organization

XDR-TBExtensively drug-resistant tuberculosis

Model compartment abbreviations are presented in Additional file 1: Table S2.

Electronic supplementary materialThe online version of this article doi:10.1186-s12916-016-0723-2 contains supplementary material, which is available to authorized users.

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Author: James M. Trauer - Jay Achar - Nargiza Parpieva - Atadjan Khamraev - Justin T. Denholm - Dennis Falzon - Ernesto Jaramillo

Source: https://link.springer.com/







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