New Insights in Screening and Preventive Treatment for Tuberculosis

A special issue of Tropical Medicine and Infectious Disease (ISSN 2414-6366). This special issue belongs to the section "Infectious Diseases".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 5596

Special Issue Editor


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Guest Editor
Global TB Programme (GTB), World Health Organization, 1211 Geneva, Switzerland
Interests: tuberculosis prevention and control; tuberculosis diagnosis; epidemiology of tuberculosis; tuberculosis transmission

Special Issue Information

Dear Colleagues,

This Special Issue of Tropical Medicine and Infectious Diseases focuses on the current state of the science and future possibilities for systematic screening and preventive treatment for tuberculosis (TB). With over 10 million people developing TB disease each year, 40% of whom are not diagnosed or reported, and an estimated one quarter of the world’s population having been infected with Mycobacterium tuberculosis, TB is a significant threat to global health.

To reduce the global burden of TB and to combat the large and persistent TB case detection gap, the WHO currently recommends systematic screening for TB and TB-preventive treatment (TPT) in populations at highest risk for the disease, including close contacts of TB patients, people living with HIV, prisoners, and miners. TB screening is also recommended in other populations at a higher risk of developing TB, including people with clinical risk factors (e.g., malnutrition, lung disease, and immunocompromising conditions) and communities with structural risk factors (e.g., the urban poor, homeless individuals, and refugee communities). Population-wide TB screening is also recommended in very-high-prevalence areas. Screening with chest radiography and computer-aided detection (CAD) are promoted as the most accurate currently available screening approaches.

However, much is still unknown about the optimal approaches for implementing TB screening and TPT, including what tools and algorithms are most effective for scaling up screening and TPT more broadly. Further research is also needed on the impact of screening and TPT on TB epidemiology, including what risk groups and populations are most essential to target with these strategies and what level of coverage is needed to achieve lasting reductions in TB burden.

The WHO’s End TB Strategy includes targets for 2025 of diagnosing and starting on treatment 90% of all people who develop TB each year, and initiating 90% of all eligible people on TPT. In order to achieve these targets, new research on and the scaling up of proven strategies are urgently needed to improve the current approaches to finding people with TB and preventing the disease in those at highest risk.

Dr. Cecily R. Miller
Guest Editor

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Keywords

  • tuberculosis/prevention and control
  • contact tracing
  • tuberculosis/epidemiology
  • tuberculosis/diagnostic imaging
  • latent tuberculosis/therapy

Published Papers (3 papers)

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Research

13 pages, 596 KiB  
Article
Factors Associated with Non-Adherence to Tuberculosis Preventive Treatment among Adult Contacts of Pulmonary Tuberculosis Cases with Latent Tuberculosis Infection in Catalonia, Spain, in 2019−2021
by Pedro Plans-Rubió, Sofia Godoy, Diana Toledo, Angela Domínguez, Joan Caylà, Ignasi Parron, Joan Pau Millet and Pere Godoy
Trop. Med. Infect. Dis. 2024, 9(3), 54; https://doi.org/10.3390/tropicalmed9030054 - 27 Feb 2024
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Abstract
The aim of this study was to identify factors associated with non-adherence to tuberculosis (TB) preventive treatment among contacts with latent TB infection for new cases of pulmonary TB cases reported in Catalonia in 2019–2021. All contacts aged 18 years or older with [...] Read more.
The aim of this study was to identify factors associated with non-adherence to tuberculosis (TB) preventive treatment among contacts with latent TB infection for new cases of pulmonary TB cases reported in Catalonia in 2019–2021. All contacts aged 18 years or older with a latent TB infection who received a TB preventive treatment were included in the study. The Chi square test and the odds ratios (OR) were used to assess the association between non-adherence to TB preventive treatment and the study variables; a p < 0.05 was considered statistically significant. Multiple logistic regression analysis was used to detect the independent factors associated with TB preventive treatment non-adherence; a p < 0.05 was considered statistically significant. The percentage of non-adherence to TB preventive treatment found in this study was 23.7%. A multivariable logistic regression analysis determined that the following factors were significantly associated with TB preventive treatment non-adherence among adult contacts: “exposure at school or workplace” (aOR = 3.34), “exposure to an index case without laboratory confirmation of TB” (aOR = 2.07), “immigrant contact” (aOR = 1.81), “male gender” (aOR = 1.75) and “exposure duration < 6 h per week or sporadic” (aOR = 1.60. By contrast, the factor “short-term TB preventive treatment regimen” (aOR = 0.38) was significantly associated with a lower treatment non-adherence. Adherence to TB preventive treatment should be improved among adult contacts of TB pulmonary cases with latent TB infection by recommending short-term treatment regimens and by developing health education activities, with a greater focus on contacts with factors associated with treatment non-adherence. Full article
(This article belongs to the Special Issue New Insights in Screening and Preventive Treatment for Tuberculosis)
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12 pages, 814 KiB  
Article
Uptake and Completion of Tuberculosis Preventive Treatment Using 12-Dose, Weekly Isoniazid–Rifapentine Regimen in Bangladesh: A Community-Based Implementation Study
by Md. Toufiq Rahman, Farzana Hossain, Rupali Sisir Banu, Md. Shamiul Islam, Shamsher Alam, Abu Jamil Faisel, Hamid Salim, Oscar Cordon, Pedro Suarez, Hamidah Hussain and Tapash Roy
Trop. Med. Infect. Dis. 2024, 9(1), 4; https://doi.org/10.3390/tropicalmed9010004 - 20 Dec 2023
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Abstract
Background: The United Nations high-level meeting (UNHLM) pledged to enroll 30 million in tuberculosis preventive treatment (TPT) by 2022, necessitating TPT expansion to all at tuberculosis (TB) risk. We assessed the uptake and completion of a 12-dose, weekly isoniazid–rifapentine (3HP) TPT regimen. Methods: [...] Read more.
Background: The United Nations high-level meeting (UNHLM) pledged to enroll 30 million in tuberculosis preventive treatment (TPT) by 2022, necessitating TPT expansion to all at tuberculosis (TB) risk. We assessed the uptake and completion of a 12-dose, weekly isoniazid–rifapentine (3HP) TPT regimen. Methods: Between February 2018 and March 2019 in Dhaka, community-based TPT using 3HP targeted household contacts of 883 confirmed drug-sensitive pulmonary TB patients. Adhering to World Health Organization guidelines, contacts underwent active TB screening before TPT initiation. Results: Of 3193 contacts who were advised health facility visits for screening, 67% (n = 2149) complied. Among these, 1804 (84%) received chest X-rays. Active TB was diagnosed in 39 (2%) contacts; they commenced TB treatment. Over 97% of 1216 contacts began TPT, with completion rates higher among females, those with more education and income, non-slum residents, and those without 3HP-related adverse events. Adverse events, mainly mild, occurred in 5% of participants. Conclusions: The 3HP regimen, with its short duration, self-administered option, and minimal side effects, achieved satisfactory completion rates. A community-focused TPT approach is feasible, scalable nationally, and aligns with UNHLM targets. Full article
(This article belongs to the Special Issue New Insights in Screening and Preventive Treatment for Tuberculosis)
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21 pages, 2096 KiB  
Article
Outcomes and Challenges in the Programmatic Implementation of Tuberculosis Preventive Therapy among Household Contacts of Pulmonary TB Patients: A Mixed-Methods Study from a Rural District of Karnataka, India
by U. C. Samudyatha, Kathirvel Soundappan, Gomathi Ramaswamy, Kedar Mehta, Chandan Kumar, M. Jagadeesh, B. T. Prasanna Kamath, Neeta Singla and Pruthu Thekkur
Trop. Med. Infect. Dis. 2023, 8(12), 512; https://doi.org/10.3390/tropicalmed8120512 - 30 Nov 2023
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Abstract
The National TB Elimination Programme (NTEP) of India is implementing tuberculosis preventive treatment (TPT) for all household contacts (HHCs) of pulmonary tuberculosis patients (index patients) aged <5 years and those HHCs aged >5 years with TB infection (TBI). We conducted an explanatory mixed-methods [...] Read more.
The National TB Elimination Programme (NTEP) of India is implementing tuberculosis preventive treatment (TPT) for all household contacts (HHCs) of pulmonary tuberculosis patients (index patients) aged <5 years and those HHCs aged >5 years with TB infection (TBI). We conducted an explanatory mixed-methods study among index patients registered in the Kolar district, Karnataka during April-December 2022, to assess the TPT cascade and explore the early implementation challenges for TPT provision. Of the 301 index patients, contact tracing home visits were made in 247 (82.1%) instances; a major challenge was index patients’ resistance to home visits fearing stigma, especially among those receiving care from the private sector. Of the 838 HHCs, 765 (91.3%) were screened for TB; the challenges included a lack of clarity on HHC definition and the non-availability of HHCs during house visits. Only 400 (57.8%) of the 692 eligible HHCs underwent an IGRA test for TBI; the challenges included a shortage of IGRA testing logistics and the perceived low risk among HHCs. As HHCs were unaware of their IGRA results, a number of HHCs actually eligible for TPT could not be determined. Among the 83 HHCs advised of the TPT, 81 (98%) initiated treatment, of whom 63 (77%) completed treatment. Though TPT initiation and completion rates are appreciable, the NTEP needs to urgently address the challenges in contact identification and IGRA testing. Full article
(This article belongs to the Special Issue New Insights in Screening and Preventive Treatment for Tuberculosis)
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