Latent TB screening for migrants shows consistent long-term value in low-burden settings
Screening migrants for latent tuberculosis infection in high-income countries with low TB burden can pay off clinically and economically, but the way services are organized appears to matter as much as the test itself. A rapid review of 41 studies, including two reviews, found consistent evidence that these programmes can be cost-saving across a range of settings, while implementation succeeds best when care is tightly integrated across services and community partners.
The analysis focused on migrants moving from high- to low-incidence TB countries, a group in whom latent infection can remain silent for years before progressing to active disease. In that context, the value of screening is straightforward: identify infection before symptoms emerge, offer treatment when appropriate, and reduce the future pool of transmission and disease. The review examined both economic evaluations and the practical barriers and facilitators that shape whether programmes function in real-world settings. Primary care, new arrivals clinics, and schools emerged as the most common screening sites.
The strongest implementation signal was structural cohesiveness. Programmes worked better when health care services were integrated, community partnerships were active, and coordination extended to social workers or accommodation staff. In practical terms, the pathway from screening to diagnosis to treatment completion depends on more than a laboratory result; it depends on whether patients can navigate appointments, understand the purpose of testing, and return for follow-up in systems that may already be unfamiliar to them.
Misunderstanding from service users was the most frequently cited barrier. Misconceptions about LTBI, the purpose of screening, and the implications of a positive test can erode attendance and adherence before treatment even begins. For clinicians, that has direct bedside consequences. A person who does not understand the difference between latent and active TB may see screening as unnecessary, or worse, as a signal of stigmatizing disease. When that happens, uptake falls and the public health value of the programme weakens.
Economic analyses favored long-term savings
Across the included studies, economic evaluations consistently showed long-term cost savings for LTBI screening programmes. The message is familiar to public health planners but still easy to underestimate: prevention often looks expensive early and efficient later. Screening, diagnostic workup, and preventive therapy require upfront resources, yet those costs are offset by fewer cases of active TB downstream, fewer treatment episodes, and less demand on public health infrastructure.
The review also found an important trade-off in who is screened. Targeting migrants from the highest TB-burden countries was more cost-effective, because the prevalence of infection is higher and the yield from screening rises accordingly. But that narrower threshold misses some cases and is less likely to identify all TB or ultimately eliminate TB. Expanding screening to a lower burden threshold captures more people at risk, but the cost per case identified rises. Health systems are left balancing efficiency against reach, and the choice will depend on local epidemiology, resources, and elimination goals.
This is where programme design becomes a policy decision rather than a simple clinical one. A narrower screen may satisfy budget pressures while leaving preventable disease on the table. A broader screen may improve case finding but require more sustained investment in staff, outreach, and treatment follow-up. The review does not force a single model onto every country; it does make clear that the threshold chosen for screening changes both cost-effectiveness and the public health ceiling of the programme.
Primary care, newcomer clinics, and schools each carried different strengths
The settings represented in the evidence base suggest that there is no single gateway into TB prevention for migrant populations. Primary care offers continuity and familiarity when systems are accessible. New arrivals clinics can capture people early after migration, when contact with services may be highest and opportunities for linkage are immediate. Schools extend reach to younger migrants and can identify infection in families who may otherwise have limited contact with formal health care.
Each setting has advantages, but none works well in isolation. Screening only succeeds when the next steps are built in: communication, referral, confirmatory testing, and treatment completion. A fragmented model risks losing people between each stage. Integrated delivery shortens that path and makes the programme feel less like a one-time test and more like a coherent prevention strategy.
For clinicians and service planners, the findings reinforce a point often seen in infectious disease control. The biology of latent tuberculosis infection is only part of the problem; the social architecture of care determines whether the biology can be interrupted. Someone with latent infection does not feel ill, and the incentive to return for testing or preventive therapy may be low unless the system actively reduces friction. Coordinated care, culturally clear messaging, and practical support are not optional extras. They are the mechanism by which screening becomes effective.
Why integration shapes outcomes more than isolated testing campaigns
The review’s clearest operational lesson is that screening cannot be treated as a stand-alone act. It works best when care is embedded in broader service networks, with collaboration across clinical teams and community partners. That kind of coordination helps with engagement, follow-up, and adherence, and it likely explains why some programmes achieved better uptake and more reliable completion than others.
The findings also point to the role of social support in infectious disease prevention. Accommodation staff, social workers, and community organizations can help solve problems that medicine alone cannot address: transport, language barriers, missed appointments, and mistrust. Those elements are especially relevant in migrant health, where mobility, uncertain legal status, and competing priorities can all interfere with continuity of care.
The evidence base reviewed here was drawn from Europe and national programmes, which gives the conclusions real policy relevance for high-income, low-burden countries. Even so, local implementation still has to match local migration patterns and local TB epidemiology. A programme that works in one health system may require different thresholds, staffing, or referral structures in another. What remains consistent is the direction of travel: screening migrants for LTBI can be effective, can save money over time, and performs best when it is organized as an integrated service rather than a disconnected intervention.
For TB control programmes, the unanswered challenge is not whether latent infection screening can work. It is how each health system will choose the threshold, support the patient pathway, and build the coordinated delivery structure needed to turn screening into prevention.