Active Tuberculosis Case Finding Interventions Among Immigrants, Refugees and Asylum Seekers in Italy

Community views on active case finding for tuberculosis in low- and middle-income countries: a qualitative evidence synthesis

BACKGROUND

Active case finding (ACF) refers to the systematic identification of people with tuberculosis in communities and amongst populations who do not present to health facilities, through approaches such as door-to-door screening or contact tracing. ACF may improve access to tuberculosis diagnosis and treatment for the poor and for people remote from diagnostic and treatment facilities. As a result, ACF may also reduce onward transmission. However, there is a need to understand how these programmes are experienced by communities in order to design appropriate services.

OBJECTIVES

To synthesize community views on tuberculosis active case finding (ACF) programmes in low- and middle-income countries.

SEARCH METHODS

We searched MEDLINE, Embase, and eight other databases up to 22 June 2023, together with reference checking, citation searching, and contact with study authors to identify additional studies. We did not include grey literature.

SELECTION CRITERIA

This review synthesized qualitative research and mixed-methods studies with separate qualitative data. Eligible studies explored community experiences, perceptions, or attitudes towards ACF programmes for tuberculosis in any endemic low- or middle-income country, with no time restrictions.

DATA COLLECTION AND ANALYSIS

Due to the large volume of studies identified, we chose to sample studies that had 'thick' description and that investigated key subgroups of children and refugees. We followed standard Cochrane methods for study description and appraisal of methodological limitations. We conducted thematic synthesis and developed codes inductively using ATLAS.ti software. We examined codes for underlying ideas, connections, and interpretations and, from this, generated analytical themes. We assessed the confidence in the findings using the GRADE-CERQual approach, and produced a conceptual model to display how the different findings interact.

MAIN RESULTS

We included 45 studies in this synthesis, and sampled 20. The studies covered a broad range of World Health Organization (WHO) regions (Africa, South-East Asia, Eastern Mediterranean, and the Americas) and explored the views and experiences of community members, community health workers, and clinical staff in low- and middle-income countries endemic for tuberculosis. The following five themes emerged. • ACF improves access to diagnosis for many, but does little to help communities on the edge. Tuberculosis ACF and contact tracing improve access to health services for people with worse health and fewer resources (High confidence). ACF helps to find this population, exposed to deprived living conditions, but is not sensitive to additional dimensions of their plight (High confidence) and out-of-pocket costs necessary to continue care (High confidence). Finally, migration and difficult geography further reduce communities' access to ACF (High confidence). • People are afraid of diagnosis and its impact. Some community members find screening frightening. It exposes them to discrimination along distinct pathways (isolation from their families and wider community, lost employment and housing). HIV stigma compounds tuberculosis stigma and heightens vulnerability to discrimination along these same pathways (High confidence). Consequently, community members may refuse to participate in screening, contact tracing, and treatment (High confidence). In addition, people with tuberculosis reported their emotional turmoil upon diagnosis, as they anticipated intense treatment regimens and the prospect of living with a serious illness (High confidence). • Screening is undermined by weak health infrastructure. In many settings, a lack of resources results in weak services in competition with other disease control programmes (Moderate confidence). In this context of low investment, people face repeated tests and clinic visits, wasted time, and fraught social interaction with health providers (Moderate confidence). ACF can create expectations for follow-up health care that it cannot deliver (High confidence). Finally, community education improves awareness of tuberculosis in some settings, but lack of full information impacts community members, parents, and health workers, and sometimes leads to harm for children (High confidence). • Health workers are an undervalued but important part of ACF. ACF can feel difficult for health workers in the context of a poorly resourced health system and with people who may not wish to be identified. In addition, the evidence suggests health workers are poorly protected against tuberculosis and fear they or their families might become infected (Moderate confidence). However, they appear to be central to programme success, as the humanity they offer often acts as a driving force for retaining people with tuberculosis in care (Moderate confidence). • Local leadership is necessary but not sufficient for ensuring appropriate programmes. Local leadership creates an intrinsic motivation for communities to value health services (High confidence). However, local leadership cannot guarantee the success of ACF and contact tracing programmes. It is important to balance professional authority with local knowledge and rapport (High confidence).

AUTHORS' CONCLUSIONS

Tuberculosis active case finding (ACF) and contact tracing bring a diagnostic service to people who may otherwise not receive it, such as those who are well or without symptoms and those who are sick but who have fewer resources and live further from health facilities. However, capturing these 'missing cases' may in itself be insufficient without appropriate health system strengthening to retain people in care. People who receive a tuberculosis diagnosis must contend with a complex and unsustainable cascade of care, and this affects their perception of ACF and their decision to engage with it.

Prevalence of tuberculosis and associated factors among presumptive TB refugees residing in refugee camps in Ethiopia

BACKGROUND

Tuberculosis (TB) causes significant morbidity and mortality in refugee populations. Although Ethiopia is the third largest refugee-hosting country in Africa, there is limited published data on the prevalence and associated factors of TB in refugees. The objective of this study was to estimate the prevalence of bacteriologically confirmed pulmonary TB (PTB) and explore associated factors in presumptive TB refugees residing in refugee camps in Ethiopia.

METHODS

A facility-based cross-sectional study was conducted between February and August 2021 in refugee camps in Ethiopia. Data were collected consecutively from 610 presumptive TB refugees who attended for TB diagnosis in selected refugee camp clinics in Ethiopia. A pre-tested questionnaire was used to collect data, and sputum samples were collected from eligible study participants. The Xpert Mycobacterium tuberculosis (MTB)/Rifampicin (RIF) assay was performed on direct spot sputum samples, whereas morning sputum samples were processed and inoculated for bacteriological culture using Mycobacterium Growth Indicator Tube (MGIT) and Lowsteen Jensen (LJ) methods. The statistical software package (STATA version 14) was used for statistical analysis. A logistic regression model was used for the evaluation of the association between bacteriologically confirmed TB cases and the associated factors. Descriptive statistics were used for the expression of the results, and statistical significance was assumed at p < 0.05.

RESULTS

Out of 610 study participants, more than half were female (54.9%), and the mean age was 37.9 years (SD, 16.64). The prevalence of bacteriologically confirmed PTB cases among refugees residing in refugee camps in Ethiopia was 13.3% (95% CI, 10.7-16.2%) using the Xpert MTB/RIF assay and/or culture. MTB was detected in 12.8% (95% CI, 10.2-15.7%) of the individuals using the Xpert MTB/RIF assay, while culture positivity was observed in 11.6% (95% CI, 9.2-14.5%). The multivariable logistic regression model showed South Sudan origins (adjusted odds ratio, AOR = 7.74; 95% CI, 3.05-19.64), age group, 19-38 years old (AOR = 5.66; 95% CI, 1.86-17.28), and male sex (AOR = 2.69; 95% CI, 1.58-4.56) were significantly associated with the bacteriologically confirmed TB among refugees residing in refugee camps in Ethiopia.

CONCLUSION

The prevalence of bacteriologically confirmed PTB among presumptive TB refugees residing in refugee camps in Ethiopia was high. The national TB program should strengthen TB prevention and control activities in the refugee camps of Ethiopia. Moreover, an active TB survey program should be implemented in refugee camps in Ethiopia.

Number needed to screen for TB in clinical, structural or occupational risk groups

BACKGROUND: Screening for active TB using active case-finding (ACF) may reduce TB incidence, prevalence, and mortality; however, yield of ACF interventions varies substantially across populations. We systematically reviewed studies reporting on ACF to calculate the number needed to screen (NNS) for groups at high risk for TB.METHODS: We conducted a literature search for studies reporting ACF for adults published between November 2010 and February 2020. We determined active TB prevalence detected through various screening strategies and calculated crude NNS for - TB confirmed using culture or Xpert^® MTB/RIF, and weighted mean NNS stratified by screening strategy, risk group, and country-level TB incidence.RESULTS: We screened 27,223 abstracts; 90 studies were included (41 in low/moderate and 49 in medium/high TB incidence settings). High-risk groups included inpatients, outpatients, people living with diabetes (PLWD), migrants, prison inmates, persons experiencing homelessness (PEH), healthcare workers, and miners. Screening strategies included symptom-based screening, chest X-ray and Xpert testing. NNS varied widely across and within incidence settings based on risk groups and screening methods. Screening tools with higher sensitivity (e.g., Xpert, CXR) were associated with lower NNS estimates.CONCLUSIONS: NNS for ACF strategies varies substantially between adult risk groups. Specific interventions should be tailored based on local epidemiology and costs.

Extended screening for infectious diseases among newly-arrived asylum seekers from Africa and Asia, Verona province, Italy, April 2014 to June 2015

Management of health issues presented by newly-arrived migrants is often limited to communicable diseases even though other health issues may be more prevalent. We report the results of infectious disease screening proposed to 462 recently-arrived asylum seekers over 14 years of age in Verona province between April 2014 and June 2015. Methods: Screening for latent tuberculosis (TB) was performed via tuberculin skin test (TST) and/or QuantiFERON-TB Gold in-tube assay and/or chest X-ray. An ELISA was used to screen for syphilis. Stool microscopy was used to screen for helminthic infections, and serology was also used for strongyloidiasis and schistosomiasis. Screening for the latter also included urine filtration and microscopy. Results: Most individuals came from sub-Saharan Africa (77.5%), with others coming from Asia (21.0%) and North Africa (1.5%). The prevalence of viral diseases/markers of human immunodeficiency virus (HIV) infection was 1.3%, HCV infection was 0.85% and hepatitis B virus surface antigen was 11.6%. Serological tests for syphilis were positive in 3.7% of individuals. Of 125 individuals screened for TB via the TST, 44.8% were positive and of 118 screened via the assay, 44.0% were positive. Of 458 individuals tested for strongyloidiasis, 91 (19.9%) were positive, and 76 of 358 (21.2%) individuals from sub-Saharan Africa were positive for schistosomiasis. Conclusions: The screening of viral diseases is questionable because of low prevalence and/or long-term, expensive treatments. For opposing reasons, helminthic infections are probably worth to be targeted by screening strategies in asylum seekers of selected countries of origin.

TB control in humanitarian emergencies: Lessons from the Syria displacement crisis

The TB care for communities in emergency contexts satellite session at the 2017 48th Union World Conference on Lung Health discussed the impact of the Syrian displacement crisis on regional tuberculosis (TB) control. At the session, representatives of the affected countries and of international organizations reviewed the epidemiologic impact of Syrian displacement on regional TB control, as well as challenges and successes seen in TB control during this displacement. This discussion offered several lessons for TB control in other humanitarian emergencies. TB control in humanitarian emergencies requires increasing awareness of TB symptoms and services among healthcare workers and the affected populations. It also requires performing standardized symptom screening at borders or registration, while leveraging more widely available radiographic and diagnostic tools to find cases in high-burden settings that may be missed using symptom screening alone. Additionally, treatment completion rates can be maintained and improved through dedication of sufficient resources and innovative strategies to keep mobile populations on treatment. Finally, sustained commitment, including funding, from the international humanitarian community is necessary to improve TB control, and ultimately end TB, both in the Syria crisis and other humanitarian emergencies worldwide.

Compliance with Tuberculosis Screening in Irregular Immigrants

Tuberculosis (TB) is a serious public health problem in many regions of the world, especially in the poorest areas. For this reason, screening for active and latent forms must be considered when dealing with high-risk groups such as irregular immigrants in Western countries. We conducted a retrospective cohort study by recruiting subjects aged ≥15 years who underwent a tuberculin skin test at a dedicated National Health Service Centre in a northern Italian province between 1 January 2012 and 31 December 2013. These participants were followed up until 31 December 2016. We aimed at evaluating an experimental protocol for active and latent tuberculosis screening, focusing on patient compliance, feasibility, and capability to detect clinical forms of the disease. We enrolled 368 irregular immigrants, i.e., immigrants not having a valid residence permit and who were therefore not entitled to choose a general practitioner. In total, 90.22% of these completed all the steps for the screening of active TB, while 87.33% also undertook screening for the latent form of the disease. Homelessness, self-reported prostitution, female sex, and employment status adversely affected compliance. Chronic alcohol consumption was associated with increased risk of no beginning or interruption of the procedures. All of the five patients with active TB successfully completed the treatment. Overall, adherence to the screening program was high compared to other studies in immigrants, possibly owing to organizational factors such as the availability of cultural mediators, the network between the different health services, the presence of dedicated nursing staff and a free-of-charge service. In addition, selected vulnerable subgroups should be targeted using tailored screening and follow-up programs.

Outbreak column 21: Tuberculosis (TB): Still a nosocomial threat

This outbreak column explores the epidemiology and infection prevention guidance on tuberculosis (TB) in the UK. The column finds that, at present, national guidance leaves UK hospitals ill-prepared to prevent nosocomial TB transmission. Reasons for this conclusion are as follows: (1) while TB is predominantly a disease that affects people with 'social ills', it has the potential to infect anyone who is sufficiently exposed; (2) nosocomial transmission is documented throughout history; (3) future nosocomial exposures may involve less treatable disease; and (4) current UK guidance is insufficient to prevent nosocomial transmission and is less than that advocated by the World Health Organization and the Centers for Disease Control and Prevention.

Time to change the single-centre approach to management of patients with tuberculosis: a novel network platform with automatic data import and data sharing

Time to change the single-centre approach to TB http://ow.ly/lCeM30hBcbB.

Crisis-Affected Populations and Tuberculosis

By definition, humanitarian crises can severely affect human health, directly through violence or indirectly through breakdown of infrastructure or lack of provision for basic human needs, such as safe shelter, food, clean water, and suitable clothing. After the initial phase, these indirect effects are the most important determinants of morbidity and mortality in humanitarian emergencies, and infectious diseases are among the most significant causes of ill health. Tuberculosis (TB) incidence in humanitarian emergencies varies depending on a number of factors, including the country background epidemiology, but will be elevated compared with precrisis levels. TB morbidity and mortality are associated with access to appropriate care and medications, and will also be elevated due to barriers to access to diagnosis and appropriate treatment, including robust TB drug supplies. While reestablishment of TB control is challenging in the early phases, successful treatment programs have been previously established, and the WHO has issued guidance on establishing such successful programs. Such programs should be closely linked to other health programs and established in close collaboration with the country's national treatment program. Individuals who flee the emergency also have a higher TB risk and can face difficulties accessing care en route to or upon arrival in host countries. These barriers, often associated with treatment delays and worse outcomes, can be the result of uncertainties around legal status, other practical challenges, or lack of health care worker awareness. It is important to recognize and mitigate these barriers with an increasing number of tools now available and described.