Half of MDR-TB Patients in Loreto Face Unsuccessful Treatment

Drug-resistant tuberculosis remains a major challenge in Loreto, Peru, where treatment success rates have lagged behind national averages. Researchers led by Evelyn Genthell Cordova-Pisco set out to understand why so many people in this Amazonian region do not complete successful treatment. The study looked back at cases recorded over eight years to identify patterns and risk factors tied to poor results. By focusing on region-specific data rather than national trends, the team aimed to pinpoint who is most likely to experience loss to follow-up, treatment failure or death, and to offer clear targets for local health programs. The work is framed around a straightforward question: among people registered in the national TB system in Loreto, which characteristics were associated with an unsuccessful outcome? Using cases from 2015 through 2023, the study assembled a group large enough to reveal important signals about age groups and behavioral risk factors. The findings are intended to guide priority actions and future research so that efforts to control tuberculosis in Loreto can be better tailored to the people most at risk.

This was a retrospective cohort study that included 417 MDR-TB cases registered in the national TB system in Loreto between 2015 and 2023. The researchers defined unsuccessful treatment outcomes to include loss to follow-up, mortality and therapeutic failure. To uncover which factors were linked to those outcomes they used binary and multivariate logistic regression analyses. Nearly half of the cases — 49.5% — ended with an unsuccessful outcome. Breaking that down, 34.1% were due to treatment dropout, 3.6% were classified as treatment failure, and 11.8% resulted in death. In the multivariate analysis several factors stood out as statistically associated with unsuccessful outcomes: being aged between 18 and 30 years (OR: 2.8; CI: 1.1-7.1), alcoholism (OR: 3.76; CI: 1.1-12.7), drug addiction (OR: 4.48; CI: 1.2-17.2) and MDR-TB (OR: 2.2; CI: 1.2-3.8). These results quantify the increased odds tied to specific age and behavioral characteristics within the study group.

The implications are direct and regionally focused: the risk factors identified in this analysis should be the focus of priority programmatic interventions and future research aimed at optimizing regional strategies for TB control in Loreto. By naming young adults, people with alcoholism and people with drug addiction as higher-risk groups, the findings point local health authorities and funders toward where resources and tailored services may have the greatest impact. The study also highlights that nearly half of registered MDR-TB cases did not reach a successful outcome, underscoring a pressing need for interventions designed for the realities of this Amazonian region. Future efforts that concentrate on the groups highlighted by the analysis, and that measure whether targeted changes reduce loss to follow-up, failure and mortality, will be essential to improving outcomes. The work by Evelyn Genthell Cordova-Pisco and colleagues provides a foundation for such targeted strategies and for further research to test what works best in Loreto.