IEC-M1: Basics of Tuberculosis and NTEP

​

Resources

• Global Tuberculosis Report, 2020; Geneva: World Health Organization, 2020
• Training Modules (1-4) for Programme Managers and Medical Officers India: Central TB Division, MoHFW, Government of India,July 2020

TB is one of the top burdensome infectious diseases in India. It is estimated that, around 1/4th (26%) of the world's TB cases are in India, translating to about 30 Lakhs new TB cases emerging each year (TB incidence). Against this estimated incidence the National TB Elimination program reported around 19 lakh new and relapse cases in the year 2021.

An estimated 5 Lakhs deaths occur due to TB each year in the country, translating to about 1 case of TB death every one-two minutes. Compared to this, there are only about 60 thousand deaths due to HIV and about 77 deaths due to Malaria each year.

TB diagnosis and treatment services although provided free of cost in the public sector, the cost of accessing these services and related loss of wages drive the affected people with poverty (catastrophic costs). TB also has a huge impact on the world's and the country's economy because of loss of workdays (100 million workdays per year).

Assessment

Resources:

• ^*WHO Global TB Report 2021
• ^{^}Status of National AIDS Response
• ^$PIB MOHFW

The National Tuberculosis Control Program (NTP) of India was launched in 1962. It relied on BCG, X-ray based diagnosis and Streptomycin and INH based treatment centralized at district level.  

Based on a review of the NTP, and WHO recommendations of the DOTS Strategy, Government of India then revised the NTP and launched new program with the title Revised National Tuberculosis Control Program (RNTCP) in 1997. It used Sputum microscopy at DMC(Designated Microscopy Centres) for diagnosis, and multi-drug Short Course Anti-TB Therapy,  decentralized to the TU (TB Unit) level. 

In recognition of the rising drug resistance problem the DOTS Plus/ PMDT (Programmatic Management of Drug Resistant TB) was launched in 2006 and scaled up to the entire country by 2012. 

Further to strengthen the monitoring and supervision system - a case based notification system - Nikshay was introduced in 2012. The same year Tuberculosis was added as a notifiable disease at the point of diagnosis by all health care providers.

Other key milestones from 2012 to 2020 were the availability of the Standards of TB Care in India (STCI) in 2014, introduction of the Daily weight band wise Fixed Dose combination (FDC) in 2016 and new drugs like Bedaquilline  and Delaminid were started in 2017 and 2018 respectively. 

To emphasise the commitment of the Government of India and to accelerate the efforts towards TB elimination, RNTCP was renamed as "National Tuberculosis Elimination Programme (NTEP)" in 2020.

Figure: Key milestones under NTEP

Resources:

• TBC India Website
• National Stratergic Plan for Tuberculosis Elimination 2017 - 2025

Those who are suspected of having TB disease are first screened for symptoms like cough and fever for more than 2 weeks, blood stained sputum and weight-loss. If found positive on screening, then TB patients are referred for testing to the nearest health facility. If diagnosed with TB, then they are subsequently initiated on treatment. The TB patients initiated on treatment are regularly monitored with the help of field staff or digital interventions like 99DOTS and MERM (Medication Event Reminder Monitor) technology. NTEP staff also ensures that the TB patients are regularly followed up on monthly basis till their treatment completion.

Figure: Patient Flow

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TB is caused due to the infection by a bacterium called Mycobacterium tuberculosis.

It often affects the lungs, and in such cases it is called Pulmonary Tuberculosis. But, it can affect almost any part of the body (except the hair and the nails), in which it is known as Extra-Pulmonary Tuberculosis.

Resources:

• Technical and Operational Guidelines for TB Control in India 2016

Tuberculosis is transmitted mainly through the air via droplet nuclei generated when a TB patient coughs or sneezes. 

It is estimated that every sputum smear-positive patient spreads the infection to 10 – 15 persons annually, if untreated..

Figure: Transmission of TB bacteria through air via droplet

Resources:

• Technical and Operational Guidelines for TB Control in India 2016
• WHO - Fact sheet details on Tuberculosis

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Active TB disease has 4 major symptoms (the 4 Symptom complex). Presence of any one of these symptoms without any other reason warrants evaluation for TB. These are:

Figure: Signs and Symptoms of TB

People affected with TB may experience other symptoms as well. These may be based on the site that is affected with TB or other more non-specific symptoms of an infection. The physician or doctor would evaluate these symptoms in view of diagnosis of TB.

Resources:

• Technical and Operational Guidelines for TB Control in India 2016

After exposure to infective droplets containing M.TB, only a small proportion gets infected and further progresses to active TB disease.

• Majority of those that get infected persist in a stage of clinical latency known as TB infection (previously known as Latent TB infection). They do not have TB disease and do not show any symptoms of TB and no evidence of any TB related changes on chest X-ray.
• A small proportion of those with prior infection may progress to active TB disease due to various environmental/ agent/ host factors.

Figure: Flow chart for TB disease progression

Resources:

• Understanding delayed T-Cell Priming, Lung Recruitment, and AirwayLuminal T-Cell Responses in Host defence against Pulmonary Tuberculosis

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Resources:

• Technical and Operational Guidelines for TB Control in India 2016

Following are the risk factors that increase the chances of developing TB disease in an individual:

Figure: Risk factors for developing active TB

Resources:

• Technical and Operational Guidelines for TB Control in India 2016

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Presumptive TB case refers to a patient who presents with symptoms or signs suggestive of TB disease (previously known as a TB suspect) and where further diagnostic workup including bacteriological investigation is required.

 Presumptive TB can be categorized into

1. Presumptive Pulmonary TB (P TB) - Symptoms are directly related to lungs (Cough, hemoptysis)

2. Presumptive Extra Pulmonary TB (EP TB) - Symptoms/ signs are specific to an extra pulmonary site (example: Lymph node swelling)

3. Presumptive Pediatric TB - Symptoms of TB in young children are more difficult to identify and can be more general (fever, weight loss) 

Resources:

• Technical and Operational Guidelines for TB Control in India 2016
• Definitions and reporting framework for tuberculosis

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As TB is an airborne infection, TB bacteria are released into the air when someone with infectious TB coughs or sneezes. The risk of infection can be reduced by taking simple precautions:

Figure: Measures for control and prevention of tuberculosis

TB Preventive Treatment(TPT) also has a very important role in prevention of TB. Presently, household contacts of sputum-positive TB patients are given TPT upon confirmation of TB infection and ruling our active Tuberculosis.

Resources:

• Technical and Operational Guidelines for TB Control in India 2016

The National Tuberculosis Control Program (NTP) of India was launched in 1962. It relied on BCG, X-ray based diagnosis and Streptomycin and INH based treatment centralized at district level.  

Based on a review of the NTP, and WHO recommendations of the DOTS Strategy, Government of India then revised the NTP and launched new program with the title Revised National Tuberculosis Control Program (RNTCP) in 1997. It used Sputum microscopy at DMC(Designated Microscopy Centres) for diagnosis, and multi-drug Short Course Anti-TB Therapy,  decentralized to the TU (TB Unit) level. 

In recognition of the rising drug resistance problem the DOTS Plus/ PMDT (Programmatic Management of Drug Resistant TB) was launched in 2006 and scaled up to the entire country by 2012. 

Further to strengthen the monitoring and supervision system - a case based notification system - Nikshay was introduced in 2012. The same year Tuberculosis was added as a notifiable disease at the point of diagnosis by all health care providers.

Other key milestones from 2012 to 2020 were the availability of the Standards of TB Care in India (STCI) in 2014, introduction of the Daily weight band wise Fixed Dose combination (FDC) in 2016 and new drugs like Bedaquilline  and Delaminid were started in 2017 and 2018 respectively. 

To emphasise the commitment of the Government of India and to accelerate the efforts towards TB elimination, RNTCP was renamed as "National Tuberculosis Elimination Programme (NTEP)" in 2020.

Figure: Key milestones under NTEP

Resources:

• TBC India Website
• National Stratergic Plan for Tuberculosis Elimination 2017 - 2025

The Government of India has committed to achieving the Sustainable Development Goals(SDG) targets related to ending TB by 2025 (5 years ahead of the global target).  This would mean that in 2025, the 2030 target of achieving 80% reduction in incidence, 90% reduction in deaths due to TB compared to that of 2015, is to be achieved.

Table: India's commitment to End TB by 2025.

Resources:

• National Strategic Plan (NSP) - 2017 - 2025
• Global TB report 2021
• END TB Strategy

The National Strategic Plan (NSP) for TB elimination 2017–25 is a bold strategic framework to drive the  acceleration of progress toward TB Elimination, and achieving the Sustainable Development Goal (SDG) and End TB targets for India. It expects to guide the activities of all stakeholders including the national and state governments, development partners, civil society organizations, international agencies, research institutions, private sector, and many others whose work is relevant to TB elimination in India. It is adopts strategies under four groups DETECT, TREAT, PREVENT, BUILD.

VISION: TB-Free India with zero deaths, disease and poverty due to tuberculosis
GOAL: To achieve a rapid decline in burden of TB, morbidity and mortality while working towards elimination of TB in India by 2025.

The results framework of the NSP outlines the various targets (impact and outcomes) to be achieved.

Resources

• Revised National Tuberculosis Control Program National Strategic Plan For Tuberculosis Elimination 2017–2025, Central TB Division, MoHFW, 2017

Assessment Questions

NSP 2012 - 2017 had the aim of achieving universal access to quality diagnosis and treatment. The NSP 2017-2025 which builds on the success and learnings of the last NSP, and articulates the bold and innovative steps required to move towards TB elimination. In 2020, RNTCP was renamed to "National Tuberculosis Elimination Programme" with the following objectives:

Figure: Objectives of NTEP

Resources:

• TBC India Website

National Tuberculosis Elimination Programme (NTEP) is a centrally sponsored programme being implemented under the aegis of National Health Mission.

National Level: Managed by Central TB Division (CTD), the technical arm of the Ministry of Health and Family Welfare (MOHFW)

State Level: State TB Cell coordinates the overall TB elimination programme in state under the guidance of State Health Society. The training ,supervision, monitoring and evaluation NTEP at state level are looked after by STDC (State TB Training and Demonstration Centre).

District TB Centre (DTC) is the nodal point for all TB elimination activities in the district under the guidance of the District Health Society.

Tuberculosis Unit (TU) Level: NTEP activities at block/sub-district level are implemented through TU which comprises Designated Medical Officer (MO) supported by two full-time NTEP staff - STS (Senior Treatment Supervisor) & STLS (Senior TB Lab Supervisor).

PHI (Peripheral Health Institute): PHI is a health facility manned by a Medical Officer (MO). Some of the PHIs are also the Tuberculosis Diagnostic Centres, which are the most peripheral level laboratories in the NTEP structure. All the Private Health Facilities like Private Practitioners / Private Hospitals / Clinics / Nursing Homes are also PHI.

Figure: Organisational structure of NTEP

Resources:

• TB India Report 2021
• Technical and Operational Guidelines for TB Control in India 2016

The State TB Cell or STC is the state-level implementing structure of the National TB Elimination Program (NTEP). It is the leading institution for management of NTEP activities at the state level. 

The STC is a State Government entity that acts as the bridge between the Central and State Governments for implementing the NTEP. It works under the guidance of the Central TB Division (CTD), and it oversees the program implementation at the districts.

1. The State TB Cell is supported by the State TB Training and Demonstration Centre (STDC) for its technical functionalities. STDC mainly supports training, supervision and monitoring.
2. The nodal laboratory for the State is the Intermediate Reference Laboratory (IRL). This supports quality assurance of the smear microscopy network and laboratory services in the state.
3. The STC has a fully operational State Drug Store (SDS) which is responsible for the effective management and uninterrupted supply of good-quality of medicines and other logistics.

Human Resources at the State TB Cell are:

1. State Tuberculosis Officer (STO). A dedicated official from the state health system, at the rank of a Joint Director is designated as the STO and heads the implementation of the NTEP at state level.
2. Medical Officer STC (MO-STC): A medical officer from the state health system assists the STO in overseeing various activities.
3. State DRTB Coordinator​: Assist the STO in DRTB activities monitoring across the districts
4. TB - HIV Coordinator: Assist the STO in overseeing TB comorbidities across the district.
5. State PPM Coordinator: Looks at the private sector engagement
6. State IEC Officer/ACSM Officer: Oversees the implementation of advocacy, communication and social mobilisation activities across different districts.
7. STC - Epidemiologist: Assist the STO and STDC Directors by analyzing state-level data and preparing review materials
8. Other support staff at the STC include
   1. Accounts Officer
   2. Technical Officer-PSM
   3. Secretarial Assistant
   4. Data entry operators/Nikshay operator

Resources

• Training Modules (1-4) for Programme Managers and Medical Officers, 2020.
• Training Modules (5-9) for Programme Managers and Medical Officers, 2020.

Assessment

The State Tuberculosis (TB) Cell (STC) is supported by the State TB Training and Demonstration Centre (STDC) in many states through its three units – Training Unit, Supervision and Monitoring Unit and an Intermediate Reference Laboratory (IRL). This relationship is shown in the figure below.

1. Training Unit: It is involved in estimating the training load, organizing state level training (Induction and Refresher) and evaluating the performance of those who undergo training.
2. Supervision and Monitoring Unit: It consists of a team which is dedicated to the supervision of TB elimination activities through supervisory visits, periodic desk review of Nikshay and Nikshay Aushadhi data, and plans state internal evaluations apart from assisting in other supervision and monitoring activities of National Reference Laboratories, Central TB Division and other national/international monitoring missions.
3. Intermediate Reference Laboratory: This supports an effective quality assurance system of the sputum smear microscopy network and laboratory services for the programmatic management of drug-resistant TB (molecular drug resistance and culture and drug susceptibility testing) in the state.

The STDC is also involved in operational research.

Human Resources in the STDC

• The STDC functions under the leadership of STDC Director. 

Training and Supervision & Monitoring Units:

• 1 Epidemiologist
• 1/more Medical Officer
• 1 Nikshay Operator
• 1 Secretarial Assistant

Intermediate Reference Laboratory (IRL):

• 1 Microbiologist
• 1 Microbiologist- External Quality Assistance (EQA)
• 1 Senior Laboratory Technician- EQA

Resources

• Training Modules (1-4) for Programme Managers and Medical Officers, 2020.
• Training Modules (5-9) for Programme Managers and Medical Officers, 2020.

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The key level for the management of public health services is the district​ level. The District Tuberculosis Centre (DTC) is the nodal point for tuberculosis (TB) control activities in the district​.

Functions of the DTC

The primary role of the DTC is a managerial one. The DTC is the central program management unit of the district responsible for all activities related to National TB Elimination Programme (NTEP) implementation such as:

• Advocacy
• Active case finding
• Diagnosis, treatment (both for drug-susceptible and drug-resistant TB cases) and follow up
• Managing comorbidities
• Service delivery
• Maintaining diagnostic and treatment infrastructure
• Setting up Drug-resistant TB (DR-TB) centres
• Ensuring community engagement and TB forums
• Multi-sectorial involvement for drug management, and supervision and monitoring
• Financial management
• Drugs, logistics and supply chain management.

Components of the DTC

1. District Drug Store (DDS)
2. Nucleic Acid Amplification Test machine (Cartridge Based NAAT or TrueNAT)
3. Designated Microscopic Center (DMC)
4. Treatment Support Center
5. Drug Resistant TB (DR-TB) Center
6. X-Ray Unit

With expansion of TB services and ongoing collaboration with various national programs, the structure of DTC is highly integrated as part of general health system and some components may cater to non-TB patients as well e.g., the DMC may be a part of general laboratory, and X-ray unit can be functional for all departments and not just chest/TB section.

Human Resources Deployed at the DTC

The Chief District Health Officer (CDHO) / Chief District Medical Officer (CDMO) / Civil Surgeon or an equivalent functionary in the district is responsible for all medical and public health activities including control of TB.

A full-time District TB Officer (DTO), trained at the national level and based at the DTC, is responsible for planning, training, supervising and monitoring the programme in the district. The DTO is assisted by other technical and secretarial staff:

1. Medical Officer- District TB Center
2. District DR-TB-HIV Coordinator
3. District Public Private Mix Coordinator
4. District Program Coordinator
5. District Drug Store Pharmacist
6. District Data Entry Operator-Nikshay
7. District Accountant
8. Senior TB laboratory Supervisor
9. Senior Treatment Supervisor
10. Laboratory Technicians for DMC and NAAT site
11. Counsellor for District DR-TB center
12. TB Health Visitors

While the National TB Elimination Program (NTEP) approves the above positions through National Health Mission NTEP Project Implementation Plan, the district always has the flexibility for additional resource deployment based on the need and existing epidemic. The DTO and his/her team are supported by various other program officers/staff and non-governmental organizations working in the field for Tuberculosis and Health.

Resources

• NTEP Training Modules 1-4 for Programme Managers & Medical Officers, 2020.
• NTEP Training Modules 5-9 for Programme Managers & Medical Officers, 2020.

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Tuberculosis (TB) unit (TU) is the sub-district level supervisory unit of National TB Elimination Program with the following organogram:

Figure: Organogram of a TB Unit

(PHI: Peripheral Health Institution)

TUs are based mainly on National Health Mission (NHM) health blocks with the aim of aligning with the NHM Block Programme Management Unit (BPMU) for optimum resource utilization and appropriate monitoring.

The TUs have been created based on a population of 1 per 2,00,000 (range 1.5 – 2.5 lakh) for rural and urban populations and 1 per 1,00,000 (0.75 – 1.25 lakh) population in hilly/tribal/difficult areas.

The TU consists of a designated Medical Officer-Tuberculosis Control (MO-TC), as well as one full-time supervisory staff - Senior Treatment Supervisor (STS). However, one Senior TB Laboratory Supervisor (STLS) will be there in every 5 lakh population (one per 2.5 lakh population for tribal/hilly/difficult areas), mostly covering 2-3 TUs.

TB Unit manages the provision of TB services (Diagnosis, Treatment, Prevention, etc.) and programme management in the assigned geographical area. 

Resources

• RNTCP Technical and Operational Guidelines for TB Control in India 2016.
• Training Modules (1-4) for Programme Managers & Medical Officers, 2020.

Under the National Tuberculosis Elimination Programme (NTEP), a Peripheral Health Institute (PHI) is a health facility that is manned by at least a Medical Officer (MO), where diagnosis and management of Tuberculosis (TB) are done.

At this level, there are dispensaries, Primary Health Centres (PHCs), Community Health Centres (CHCs), referral hospitals, major hospitals, speciality clinics or hospitals (including other health facilities), TB hospitals, Anti-retroviral Treatment (ART) centres and medical colleges within the respective district.

All health facilities in the private and Non-government Organisation (NGO) sectors participating in NTEP are also considered PHIs. Some of these PHIs also function as Designated Microscopy Centres (DMCs).

Role of PHIs in Program Management for TB Elimination

• PHIs undertake tuberculosis case-finding and treatment activities as a part of the general health services.
• In situations where more than one MO is posted in any of the PHC, one of them may be identified and entrusted with the responsibilities of the NTEP.
• Additionally, NTEP provides 1 TB Health Visitor (TBHV) per one lakh urban population to support the urban TB control activities in urban settings/ medical colleges.

Resources

• NTEP Training Modules 1-4 for Programme Managers & Medical Officers, 2020.
• NTEP Training Modules 5-9 for Programme Managers & Medical Officers, 2020.

Drug-resistant Tuberculosis Centres (DR-TBCs) are specialized centres for the clinical management of Drug-resistant TB (DR-TB). ​

Each DR-TBC needs to have established a DR-TB committee to carry out the clinical management of DR-TB patients.​

DR-TBCs can be established in the public sector where appropriate facilities are available. ​

• The DR-TBC can also be established in the private sector on mutually agreeable terms and conditions based on the Guidance Document on Partnerships, 2019.

District level:  There are District Drug-resistant TB Centres (DDR-TBCs) to manage DR-TB cases. ​These centres will function under the guidance of Nodal Drug-resistant TB Centres (NDR-TBCs). Almost every district has a mandate to establish a DDR-TBC in India. There are around 620 DDR-TBCs established in the country.​

State/ Regional level: At the state/ regional/ division level, there are NDR-TBCs to manage seriously ill DR-TB cases. ​There are 173 NDR-TBCs established in India.​

Decentralized DR-TB services through an expanded network of DR-TB centres has helped the National TB Elimination Program in improving access to DR-TB services and has also resulted in improved DR-TB treatment linkage and better management of DR-TB patients.

Resources

• Guidelines for Programmatic Management of Drug-resistant TB in India, 2021.

The Standards for TB Care in India (STCI), which is a locally customized version of the International Standards of Tuberculosis Care, mentions 26 standards that every citizen of India should receive irrespective of the sector of treatment. 

STCI were developed based on a series of discussions involving various stakeholders including clinicians, public health specialists, community workers and patient advocates. 

STCI represent what is expected for quality TB care from the Indian healthcare system including both public and private systems. 

It was first published in 2014 and outlines standards across the four themes of TB diagnosis, TB treatment, public health action and social inclusion.

Following are the list of the 26 Standards:

Table 1: Categorisation of the Standards for TB Care in India, Source: Standards for TB Care in India, World Health Organisation, pp. 13-23

Resources

• Standards for TB Care in India, World Health Organisation, 2014

Assessment

Those who are suspected of having TB disease are first screened for symptoms like cough and fever for more than 2 weeks, blood stained sputum and weight-loss. If found positive on screening, then TB patients are referred for testing to the nearest health facility. If diagnosed with TB, then they are subsequently initiated on treatment. The TB patients initiated on treatment are regularly monitored with the help of field staff or digital interventions like 99DOTS and MERM (Medication Event Reminder Monitor) technology. NTEP staff also ensures that the TB patients are regularly followed up on monthly basis till their treatment completion.

Figure: Patient Flow

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Screening for active tuberculosis (TB) a process to filter out people who are less likely to have TB, from a group. Screened positive people are likely to have TB and are confirmed subsequently using a TB diagnostic test. This will allow finite diagnostic testing resources to be used on the remaining.

Screening in TB may be performed ​using simple field tools (4 Symptom complex) and tests such as Chest X-ray, or a combination of both. ​Combination of both is the most effective, but is often not applied due to the practical difficulties in making a chest X-ray conveniently available.

Screening is an integral part of any general case finding effort. It is also applied systematically in specific situations.

1. At health care facilities (intensified case finding): Here those visiting are screened using the 4 symptom complex, often at the point of entry to the facility. Those screened positive may be fast-tracked to TB Diagnostic testing.
2. In vulnerable populations in active case finding efforts: Here the entire population identified for active case finding are screened using the pre-decided protocols by going door to door. 

Resources

• Systematic Screening for Active Tuberculosis; Principles and Recommendations, WHO 2013.
• National Strategic Plan for Tuberculosis Elimination 2020–2025.

People who have been exposed to patients with infectious TB are known as TB contacts; they constitute a high-risk group for TB. Case finding investigation contributes to the early detection of TB cases, and results in identifying a significant number of additional patients.

Figure: Approaches to Tuberculosis Case Finding

Active case-finding requires systematic screening and clinical evaluation of populations who are at high risk of developing TB, such as people living in slums, tribal areas, congregate settings, persons who are household contacts of TB cases

Resources:

• Assessing TB Case-Finding

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Systematic screening of all individuals of a defined population is known as active case finding.  It is applied outside of health facilities at the community level by the health system.

Objective of ACF is to:

1. identify cases early, initiate prompt treatment, reduce risk of poor treatment outcomes and reduce risk of further transmission of TB
2. to provide access to diagnosis services to populations that would have been otherwise unreached

It is effort intensive and is recommended only in population groups where there is estimated high case load. In NTEP, ACF is recommended only to be performed in Key / vulnerable population.

ACF can also be clubbed with suitable ACSM campaigns to create awareness about the signs and symptoms and about TB in the target population/ community. It can also be combined with other health activities/ campaigns (such as Pulse Polio/ Leprosy screening/ population based screening for NCDs) for increased efficiency.

Resources

1. Training Modules for Programme Managers and Medical Officers.
2. Active TB Case Finding, Guidance Document.
3. WHO recommendations for Systematic Screening for Active Tuberculosis

Assessment

Resources:

• Guidelines for Programmatic Management of Drug Resistant Tuberculosis in India, March 2021 
• WHO Consolidated Guidelines on Tuberculosis: Module 4-Treatment: Drug resistant TB Treatment, 2020

• New case - A TB patient who has never had treatment for TB or has taken anti-TB drugs for less than one month is considered as a new case. 
• Previously treated patients have received 1 month or more of anti-TB drugs in the past. They could be further classified as:
• Recurrent TB case - A TB patient previously declared as successfully treated(cured/treatment completed) and is subsequently found to be microbiologically confirmed TB case is a recurrent TB case. 
• Treatment After failure patients are those who have previously been treated for TB and whose treatment failed at the end of their most recent course of treatment.  
• Treatment after loss to follow-up A TB patient previously treated for TB for 1 month or more and was declared lost to follow-up in their most recent course of treatment and subsequently found microbiologically confirmed TB case 
• Other previously treated patients are those who have previously been treated for TB but whose outcome after their most recent course of treatment is unknown or undocumented. 
• Transferred In: A TB patient who is received for treatment in a Tuberculosis Unit, after registered for treatment in another TB unit is considered as a case of transfer in.
• Transferred Out : A patient who has been transferred to another recording and reporting unit and whose treatment outcome is unknown.

On the basis of diagnosis, Tuberculosis (TB) can be classified into 2 main types:

1. Microbiologically confirmed TB
2. Clinically diagnosed TB

Microbiologically Confirmed TB

• Microbiologically confirmed TB refers to a presumptive TB case from which a biological specimen is positive for acid-fast bacilli/ Mycobacterium tuberculosis on smear microscopy, culture, or on a rapid diagnostic molecular test (such as Cartridge-based Nucleic Acid Amplification Test (CBNAAT)/ Truenat).
• All such diagnosed cases should be notified at the source, regardless of whether TB treatment has started.

Clinically Diagnosed TB

• Clinically diagnosed TB refers to a presumptive TB case that is not microbiologically confirmed but has been diagnosed with active TB by a clinician who has decided to give the patient a full course of anti-TB treatment.
• This definition includes cases diagnosed on the basis of X-ray abnormalities or suggestive histology or extrapulmonary cases without laboratory confirmation.
• Clinically diagnosed cases subsequently found to be microbiologically positive (before or after starting treatment) should be reclassified as microbiologically confirmed.

Resources

• Training Modules (1-4) for Programme Managers and Medical Officers, 2020.
• Definitions and Reporting Framework for Tuberculosis, WHO, 2013.

Assessment