An interventional study of The comprehensive TDA based approach in Tuberculosis, Child Health and HIV, sponsored by Chishala Chabala. Recruiting at 29 sites in Zambia. Open to participants aged Up to 14 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-03-24.
Sponsored by Chishala Chabala · Not applicable, Interventional, and Diagnostic
The Decide-TB project aims to generate evidence for the implementation of a comprehensive Treatment Decision Algorithms (TDA) based approach for TB in children living in high TB burden and resource-limited countries, at District Hospital (DH) and Primary Health Centre (PHC) levels, and to facilitate the integration of this evidence within practices and policies.
This programmatic pilot led by the National TB Programs (NTP) will test a TDA-based approach integrating TB screening, diagnosis, treatment decision-making, and disease severity assessment for shorter treatment eligibility, for use at a lower level of healthcare. This TDA-based approach will be evaluated in a hybrid effectiveness implementation study based on a pragmatic stepped wedge cluster-randomized trial. The Decide TB project will be implemented at the district level, targeting five districts in each country. Each cluster in a district will be made up of one district hospital and six primary health centers. The study will develop a Clinical Decision Support System (CDSS) to operationalize the use of TDAs, and strengthen District Health Information Systems (DHIS2) to collect individual data, which will contribute to monitoring and evaluation, clinical mentoring, and supervision by the country's NTPs.
The Decide-TB trial is a pragmatic cluster-randomized study utilizing a stepped wedge design to provide scientific evidence on a comprehensive TDA-based approach for TB screening, diagnosis, and treatment in children under 15 years at low healthcare levels in Zambia and Mozambique.
The trial's primary objective is to evaluate the effectiveness, feasibility, implementation, acceptability, costs, cost-effectiveness, and adoption of a TDA-based approach for childhood TB screening, diagnosis, and treatment decision-making under programmatic conditions at District Hospitals (DH) and Primary Health Centres (PHC) levels in these countries.
There are five specific objectives corresponding to the trial's research components:
The intervention will be implemented as a programmatic pilot, following the National TB Programs' decision in Mozambique and Zambia to adopt a TDA-based approach in line with World Health Organisation's (WHO) conditional recommendations. Additionally, both the standard of care and the intervention will be implemented in a non-randomized district to document diagnostic accuracy throughout the trial. The Decide-TB trial is a hybrid effectiveness-implementation trial (type 2), assessing both the clinical intervention's effectiveness and the feasibility and utility of the implementation strategy.
Diagnostic accuracy of both the standard of care and the intervention will be evaluated in an additional district, which will transition to the intervention phase alongside the last district selected per the stepped wedge design. Aggregated data will be retrospectively collected over 12 months from all participating districts and health facilities.
The Decide-TB trial endpoints include effectiveness, acceptability, implementation, health economics, and health policy. Effectiveness endpoints include the proportion of children who started TB treatment, the time it takes to make a treatment decision, and the consistency of TDA results with final treatment decisions, among other factors. Acceptability endpoints consider user preferences and local social value, whereas implementation endpoints evaluate the practicality, fidelity, contextual aspects, and sustainability of the TDA-based method. Health economics endpoints include cost assessments, cost-effectiveness, and budget impact of scaling up the TDA-based approach vs the standard of care, while health policy endpoints look at key stakeholders' roles, practices, and policy translation processes.
1,170 studies on the registry are indexed under Tuberculosis; 175 are open to participants now.
This study's planned enrollment of 30,240 is above the median of 150 across 820 interventional studies indexed under Tuberculosis.
Browse Tuberculosis studies →This is the only study on the registry with Chishala Chabala as lead sponsor.
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The effectiveness assessment will be conducted using aggregated or individual data from direct beneficiaries of the intervention:
The WHO definition of presumptive TB will be used, as defined in the 2022 WHO Operational Handbook, namely: children are classified as having presumptive TB if they have unremitting symptoms lasting more than 2 weeks (any one of cough, fever, not eating well or anorexia, weight loss or failure to thrive, fatigue, reduced playfulness or decreased activity) .
The definitions of presumptive TB have been adapted locally for the programmatic pilot. All children with presumptive TB as defined locally will be considered in the intervention and in secondary effectiveness and sub-group analyses.
High-risk group will be defined using the definition in WHO-suggested TDAs A\&B as children younger than 2 years, CLHIV or children with SAM. CLHIV will be defined per national testing strategy including positive PCR test for children below the age of 18 months. Children will be considered to have SAM (and thereby be eligible for the TB-Speed SAM algorithm) using WHO criteria. These include being \<5 years with a weight-for-height Z score (WHZ) \< -3 SDs or mid-upper arm circumference (MUAC) \< 115 mm (in children over 6 months) or clinical signs of bilateral pitting oedema, and being aged ≥5 years with a (BMI) for age Z-score \< -3SD.
Exclusion Criteria:
There will be no exclusion criteria for the programmatic pilot: all children will be offered the intervention.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The District Hospitals and Primary Health Centres in study districts will implement TB diagnosis for children as per the current Standard of Care (control) in both countries . In Mozambique, the SOC is based on local algorithms which include: TB symptoms screening (TB contact history), HIV testing, Xpert testing on induced sputum (and stool), and a tuberculin skin test. Urine Lipoarabinomannan (LAM) is indicated for Children Living with HIV (CLHIV). No CXR is performed. In Zambia, the SOC is based on the Union desk guide algorithm which includes: TB symptom screening (TB contact history), HIV testing and Xpert testing on respiratory or stool samples. Urine LAM is indicated for CLHIV,Severe Acute Malnutrition, sepsis, immune-suppression; chronic kidney diseases and cancer. CXRs are performed depending on the facilities. Other tests and imaging are advised in presumed extrapulmonary TB cases. A confirmed TB diagnosis is made based on a positive Xpert or LAM test.
Children will benefit from the country SOC as described in the control arm, plus the study intervention
Other: The comprehensive TDA based approach
The intervention consists of implementing a comprehensive TDA-based approach for TB diagnosis and treatment decision-making, including shorter treatment for non-severe TB in children identified as TB presumptive cases through a CDSS. It will also include the management of high-risk groups. In practice, all sick children will be assessed using the WHO-suggested TDAs A with CXR (DH) and B without CXR (PHC). CLHIV and those hospitalised with SAM at DH will have further assessment and treatment decisions based on the PAANTHER and TB-Speed SAM TDAs, respectively. Clinical and microbiological assessment data will be incorporated into a CDSS to help with the clinical decision to initiate TB treatment. The CDSS will incorporate specific features and test results for high-risk group children based on the PAANTHER TDA and the TB-Speed SAM TDA and will incorporate the results of the severity assessment to guide the choice of TB treatment duration once children are diagnosed with TB.
Effectiveness endpoints: Children initiated on TB treatment
Proportion of children started on treatment for TB among sick children attending care at participant health facilities for any health complaints
Time frame: Throughout the study, an average of 24 months
Effectiveness endpoints: Children treated for TB among those with presumptive TB
Proportion of children treated for TB among those with presumptive TB, including children with microbiologically confirmed TB.
Time frame: Throughout the study, an average of 24 months
Effectiveness endpoints: TB treatment proportion in high-risk pediatric groups
Proportion of children from high-risk groups treated for TB (age \<2 years, CLHIV, children with SAM) i) among all children from high-risk groups attending care, ii) among children from high-risk groups with presumptive TB.
Time frame: Throughout the study, an average of 24 months
Effectiveness endpoints: Microbiologically confirmed TB cases
Proportion of children with TB that are microbiologically confirmed (i.e. smear or Xpert or LAM positive), ratio of \<5 to 5-14 years among children with TB, ratio of pulmonary TB to extrapulmonary TB (EPTB).
Time frame: Throughout the study, an average of 24 months
Effectiveness endpoints: Time to TDA assessment completion
Time from presumptive TB identification to final TB treatment decision and access to TB diagnostic assessment defined as the proportion of children with presumptive TB having completed assessment with the TDAs and CDSS, including in high-risk groups.
Time frame: From the start of intervention to the end of the project, an average of 21 months
Effectiveness endpoints: Concordance of TDA results and TB treatment decisions
Concordance of the TDA result and the final TB treatment decision using the proportion of children wrongly initiated or not initiated on TB treatment defined as: i) children not started on TB treatment despite positive score; ii) children initiated on TB treatment despite negative score. Reasons for both decisions will be collected.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: Missed and over-diagnosed TB cases
Proportion of missed TB cases (false negative) and over-diagnosed TB cases (unlikely TB with a positive score, i.e. false positive).
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: Concordance of TB severity evaluation and treatment regimen decision
Concordance of the severity evaluation and decision for short TB treatment regimen using the proportion of i) children with 4-month TB treatment regimen used despite severe disease as assessed by the clinical/CXR evaluation; ii) children with 6-month TB treatment regimen despite non-severe disease as assessed by the clinical/CXR evaluation.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: False positive and negative TB severity assessments
Proportion of false positive and false negative TB severity assessments at low level of health care: i) children with non-severe disease according to clinical criteria despite severe disease as evaluated by expert CXR read; ii) children with clinically assessed severe disease despite non-severe disease as evaluated by expert CXR read.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: Non-severe TB cases initiated on shorter treatment
Proportion of children with presumptive TB and with non-severe TB disease initiated on shorter TB treatment.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: TB treatment outcomes stratified by severity and regimen duration.
TB treatment outcomes as defined per WHO (treatment success, cured, treatment completion, loss to follow-up, death, treatment failure) overall and stratified by severity and regimen duration.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: Deaths averted
Number of deaths averted assessed through modelling.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Effectiveness endpoints: Child TB among all diagnosed TB cases, including adults
Number of adults with TB, including microbiologically confirmed TB, and proportion of all TB diagnosed that is child TB.
Time frame: Throughout the study, an average of 24 months
Acceptability endpoints: Preferences
Proportion of healthcare providers' preferences in delivering childhood TB screening, diagnosis, and treatment decision-making, comparing the comprehensive TDA-based approach vs. the Standard of Care (SOC) approach, as assessed by TB diagnosis questionnaire, a self-administered questionnaire, completed every 3months in both arms, by all healthcare providers involved in child care.
Time frame: Throughout the study, an average of 24 months
Acceptability endpoints: Local social value (users)
Proportion of healthcare providers' preferences/ alignment with values and perceived potential to impact on lived experience) of the comprehensive TDA-based approach, including associated digital tools, to users (healthcare providers) as part of their work duties in childhood TB care, assessed by questionnaires.
Time frame: Throughout the study, an average of 24 months
Acceptability endpoints: Local social value (beneficiaries)
Proportion of beneficiaries' (children and their caregivers receiving a diagnosis of TB) local social value of the comprehensive TDA-based approach, including associated digital tools, as assessed by interviews and group discussions
Time frame: Throughout the study, an average of 24 months
Acceptability endpoints:Health systems and socioeconomic factors
Number of health systems and socioeconomic factors influencing preferences and local social value of the comprehensive TDA-based approach, including associated digital tools, for users and beneficiaries, as assessed by questionnaires, interviews and group discussions
Time frame: Throughout the study, an average of 24 months
Implementation endpoints: Feasibility
Feasibility of implementing and delivering the comprehensive TDA-based approach, including associated digital tools: health systems, logistical, managerial, challenges faced during implementation, and solutions found as assessed by the TB diagnosis questionnaire.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Implementation endpoints: Fidelity
Fidelity to intervention delivery and to implementation strategies: adherence to intervention procedures and implementation guide/manuals, adaptations, quality of implementation and intervention delivery.Assessed based on project process data (for example number and regularity of support supervision visits achieved compared to what was planned); fidelity of intervention delivery will based on the TB diagnosis questionnaire (number of health care worker reporting using TDAs to diagnose TB in children).
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Implementation endpoints: Contextual factors
Number of contextual factors influencing intervention delivery and implementation (at Individual, facility, health systems and community-level): barriers and facilitators as assessed by questionnaires, interviews and group discussions.
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Implementation endpoints: Sustained intervention delivery
Number of facilities reporting using TDAs for childhood TB diagnosis 6 months post intervention period as assessed by sustainability questionaries.
Time frame: 6 months post intervention
Health economics endpoints: Cost analysis 1
Total TB care costs from the health system perspective.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost analysis 2
Unit cost per TB care activity (e.g. clinical assessment, CXR).
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost analysis 3
Total TB care costs of overdiagnosis (false positive)
Time frame: From the start of intervention to the end of the intervention, an average of 21 months
Health economics endpoints: Cost analysis 4
Total costs incurred by parents/caregivers for receiving child TB care
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness; Modelled health impact measure 1
Number of children treated for TB.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness; Modelled health impact measure 2
Number of adults treated for TB.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness; Modelled health impact measure 3
Number of deaths.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness; Modelled health impact measure 4
Measure of healthy life lost, either through premature death or living with disability due to illness; Disability-Adjusted Life Years (DALYs)
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness- Incremental cost 1
Incremental number of children treated for TB.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness- Incremental cost 2
Incremental cost per Death averted.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Cost effectiveness- Incremental cost 3
Incremental cost per DALY averted.
Time frame: Throughout the study, an average of 24 months
Health economics endpoints: Budget impact 1
Cost of scaling up the comprehensive TDA-based approach nationally.
Time frame: Throughout the study; an average duration of 24 months and extending up to 5 years after its conclusion.
Health economics endpoints: Budget impact 2
Cumulative number of children and adults treated for TB, lives saved, and DALYs averted during a 5-year scale-up.
Time frame: Throughout the study; an average duration of 24 months and extending up to 5 years after its conclusion.
Health Policy endpoints: Roles, practices and processes
Roles, practices and processes among implementers and decision-makers of the comprehensive TDA-based approach, including associated digital tools, at district-level.
Time frame: Throughout the study, an average of 24 months
Health policy endpoints: Translation mechanism
Mechanism of translation of the research results and evidence on the comprehensive TDA-based approach, including associated digital tools, into public policies and practices: experience and perceptions of key stakeholders at regional, national and district-level.
Time frame: At the end of the project, after 24 months since the start of the project
Plan to share: Yes — Individual participant data (IPD) will be available after de-identification. Access to the IPD dataset for each specific publication will be provided upon request to the coordinating investigators and with approval by the study sponsors and scientific oversight committee.
Supporting information: Study protocol, Statistical analysis plan, Informed consent form
Time frame: Access to data will be given after the publication of the main study results based on global data
Access criteria: Data can be requested by Decide-TB consortium members and partners, as well as external research groups. Data can be utilised for secondary studies of the Decide-TB project, country-specific analyses, contributions to individual data meta-analyses, and analyses unrelated to the Decide-TB project's study topic. The request for data access must be submitted to the publication committee together with a concept paper detailing the analysis or study's aims, how the data will be utilised, the list of data or material requested, and how the original authors will be credited. Once the application is granted, data will be shared in accordance to a data and/or material sharing agreement that secures the terms of use.
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