Perceptions of persons deprived of liberty regarding tuberculosis vaccine research

Publication date: Jul 05, 2025

Background Several tuberculosis (TB) vaccine candidates are currently advancing to late stage clinical trials. Prisons in low- and middle-income countries harbor some of the highest rates of TB in the world, making persons deprived of liberty (PDL) an important population to prioritize for the introduction of effective vaccines. However, their inclusion in clinical trials raises significant ethical concerns due to a history of exploitation and mistreatment within medical research. To date, PDLs own perspectives on participating in vaccine research have been largely overlooked. This study aimed to understand the perceptions of PDL regarding TB, vaccines, and their potential participation in clinical trials of new TB vaccines. Methods This multicenter qualitative study employed focus group (FG) discussions in seven state prisons across four of the five regions of Brazil, involving 91 incarcerated individuals (64 men and 27 women). Participants were selected through convenience sampling and interviewed between February and August 2024. The FGs followed a standardized structure, exploring participants’ perceptions regarding health in prisons, TB, vaccines in general, new TB vaccines, and their potential participation in research. The discussions were transcribed verbatim and analyzed using thematic content analysis. Results Participants reported encountering difficulties in accessing healthcare services within the prison system. They also shared personal or indirect experiences with TB, as well concerns about their family members being at risk for tuberculosis exposure. While participants generally held positive perceptions about vaccines and vaccine trials, they emphasized the need for clear and transparent information, respect for individual autonomy, and assurances of accountability from researchers as conditions of their willingness to participate in future TB vaccine trials. Conclusions PDL perceptions regarding participation in clinical trials for new TB vaccines are significantly influenced by their prior experiences with the prison health system and their level of trust in research institutions. To ethically and effectively include PDL in future research, it is crucial to prioritize respect for participant autonomy and transparent communication about the risks and potential benefits involved.

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