Prevention and Mass Screening of TB in Prisons in Paraguay
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Type 1 - Intensive Intervention, Type 2 - Optimized intervention, Type 3. Control..
- Who it may be relevant to
- Registry conditions: Tuberculosis (TB), TB Infection, Prisoners, Epidemiology. Basic parameters: 18 years — 65 years · Male.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Paraguay
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Prevention and Mass Screening of TB in Prisons in Paraguay (PRESMAP-TB)
Overview
The goal of this interventional study is to evaluate three tuberculosis (TB) screening and prevention strategies in prisons in Paraguay. The main questions it aims to answer are: * Which strategy is more effective for reducing the incidence rate of active TB? * Which strategy is more effective for reducing the TB infection rate? * Are these strategies safe, feasible, and cost-effective in prison settings? Researchers will compare three cluster-based, non-randomized programmatic strategies implemented in three prisons. These strategies differ in the frequency of screening, the diagnostic methods used, and the approach to tuberculosis preventive therapy (TPT). Participants will: * undergo informed consent and clinical evaluation * receive TB screening through symptom assessment, chest digital X-ray with CAD, and rapid molecular testing, depending on site strategy * undergo IGRA testing and preventive therapy assessment, depending on the assigned strategy * be followed for 18 months, with screening rounds every 6 months or annually depending on the prison
Interventions
- Diagnostic test Type 1 - Intensive Intervention
Type 1. This is the branch with the highest intervention intensity. Mass screenings for active and latent TB will be conducted at months 0, 6, 12, and 18. Mass TB testing will be performed on the entire prison population. - Diagnostic test Type 2 - Optimized intervention
Type 2. This is the intervention with mass screenings for active and latent tuberculosis that will be carried out in months 0, 6, 12 and 18. TPT treatment will only be given to groups of people with HIV+ and other immunocompromised individuals. - Diagnostic test Type 3. Control.
Type 3. This intervention involves mass screening for active and latent tuberculosis, to be conducted in months 0 and 12. TPT treatment will be administered only to HIV-positive and other immunocompromised individuals. This intervention is similar to that of the NTP.
Primary outcome measures
- Point prevalence of active tuberculosis at each screening round [Time frame: At baseline and every 6 months up to 24 months]
- Incidence of active tuberculosis between screening rounds [Time frame: Continuously assessed between screening rounds over 24 months]
- Incidence of latent tuberculosis infection (LTBI conversion) between screening rounds [Time frame: Every 6 months up to 24 months]
- Progression from latent tuberculosis infection to active tuberculosis [Time frame: Up to 24 months]
Secondary outcome measures (3)
- Point prevalence of latent tuberculosis infection (LTBI) at each screening round [Time frame: Baseline, 6, 12, 18, and 24 months]
- Cumulative yield of repeated mass screening [Time frame: Up to 24 months]
- Interval tuberculosis diagnoses between screening rounds [Time frame: Continuously assessed between rounds up to 24 months]
Eligibility criteria
Inclusion criteria
- Be a person deprived of liberty (PDL) residing in one of the participating penitentiary centers during the study period.
- Be 18 years of age or older at the time of enrollment.
- Be present in the penitentiary facility at the time of a screening round or enter the facility during the study period.
- Provide informed consent to participate in the study.
Exclusion criteria
- Are currently undergoing treatment for active tuberculosis at the time of the screening round.
- Have a medical condition that, in the opinion of the clinical staff, prevents the safe performance of the planned diagnostic procedures.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- Non-randomized
- Model
- Parallel assignment
- Masking
- Open label
- Primary purpose
- Diagnostic
Study locations
Paraguay · 1 center
- Universidad Nacional de Caaguazú — Coronel Oviedo
Publications
- da Silva Peres Bezerra W, Jung E, Croda MG, de Oliveira RD, da Silva Santos A, Tsuha DH, Dos Santos PCP, Cunha EAT, Croda J, Andrews JR. The role of tuberculosis symptoms in transmission risk to cell contacts in prisons. medRxiv [Preprint]. 2025 May 27:2025.05.27.25328413. doi: 10.1101/2025.05.27.25328413. PMID 40492062
- Pivetta de Araujo RC, Martinez L, da Silva Santos A, Ferreira Lemos E, Dias de Oliveira R, Croda M, Porto Batestin Silva D, Lemes IBG, Cunha EAT, Goncalves TO, Pereira Dos Santos PC, Oliveira da Silva B, Cavalheiro Maymone Goncalves C, Andrews J, Croda J. Serial Mass Screening for Tuberculosis Among Incarcerated Persons in Brazil. Clin Infect Dis. 2024 Jun 14;78(6):1669-1676. doi: 10.1093/cid/ciae PMID 38324908
Identifiers
NCT: NCT07520448 · PRESMAP-TB-Estr01-34 · Estr01-34