STS

Silicosis is a progressive and disabling interstitial lung disease caused by inhalation and deposition in the lungs of particles of free silica.

Mutual Risk of TB and Silicosis

The NTEP has prioritized the target population for TPT based on elevated risk of progression from infection to TB disease or increased likelihood of exposure to TB disease. 

The target populations have been divided into two groups:

1. Household contacts of bacteriologically confirmed pulmonary TB patients notified in Nikshay from public and private sector.

In the cascade of care approach, all target populations (People Living with HIV (PLHIV), Household Contacts (HHCs) and other such groups) who are at risk of developing TB disease are systematically reached out, screened for TB disease and after ruling out active TB disease, provided TB Preventive Treatment (TPT) as a part of the continuum of care.

The cascade of care approach among TPT target populations is shown in Figure 1.

There are two programmatic approaches for Tuberculosis Preventive Therapy (TPT) implementation:

1. Test-and-treat approach – This approach aims to detect TB infection among key groups for implementing TPT.

Interferon Gamma Release Assay (IGRA) and Tuberculin Skin Tests (TST) are performed on individuals who are ruled out for active TB disease. 

Counselling is of paramount importance for TB Preventive Treatment (TPT) initiation and completion as most of the target population screened and found eligible would know that they do not have TB disease, would be symptom-free or otherwise healthy and would not feel the need to take any treatment, especially Household Contacts (HHC).

Stakeholders Involved in Counselling for TPT (Figure below)

To achieve high treatment completion rates and the desired epidemiological impact of the TB Preventive Treatment (TPT), monitoring TPT treatment adherence, including management of missed doses and Adverse Drug Reactions (ADRs), is of paramount importance under the National TB Elimination Programme (NTEP).

Significance of Monitoring Adherence to TPT

Adherence to the TPT course and treatment completion are important determinants of clinical benefit, both at the individual and population levels as:

Intensive Phase(IP): Consists of eight weeks (56 doses) of HRZE in daily dosages as per weight of patient.

Continuation Phase(CP): Consists of 16 weeks (112 doses) of HRE in daily dosages as per weight of patient.