Diagnosis of Active Tuberculosis in Children: Introduction — MSF Tuberculosis — Médecins Sans Frontières 2026

MSFClinical guideline (chapter)Current edition

From Tuberculosis › Chapter 4: Diagnosis of active tuberculosis in children · Médecins Sans Frontières, Current online edition, 2026

MSF guidance on epidemiology, risk factors and clinical principles for diagnosing TB in children under 10 years.

In one sentenceIn children under 10 years, start TB treatment without delay in high-risk cases; use the index case's drug resistance profile to guide therapy when the child's profile is unavailable.

Issuer: Médecins Sans Frontières
Edition: Current online edition, 2026
Audience: Clinicians and public health professionals managing tuberculosis in children
Evidence: Based on WHO guidelines and published literature
Reviewed: 21 Oct 2026 · GMJ

Read the original on MSF Whole guideline (PDF)

Summary by GMJ Guidelines Desk•Reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD•Record updated 21 Oct 2026•Next check Apr 2027

What this guideline says

GMJ summary

This introductory section of MSF’s tuberculosis guideline addresses the diagnosis of active tuberculosis in children, defined as patients under 10 years of age. Globally, more than one million children develop active TB annually, with 60% of cases remaining undiagnosed or unreported. The risk of TB infection and progression to active disease is particularly high in children under 5 years, with rapid progression (within 12 months) in those under 2 years.

Children under 5 years and immunocompromised children face higher risk of severe forms including miliary TB, TB meningitis, and extrapulmonary TB. The most common extrapulmonary forms are lymph node and pleural TB, whilst osteoarticular TB represents 1–2% of paediatric cases. HIV infection and severe acute malnutrition are significant risk factors, with almost all TB deaths in children occurring in untreated cases, predominantly in those under 5 years.

The guideline emphasises that TB treatment should not be delayed whilst awaiting investigations in high-risk children. Children typically share the same drug resistance profile as their index case (presumed source of infection), which should guide treatment when the child’s own profile is unavailable. Children are generally not considered infectious unless they have extensive lung involvement, cavitary pulmonary TB, or positive smear microscopy.

Key points

For clinicians — doses and thresholds as stated in the guideline

Children are defined as patients under 10 years of age for the purposes of this guideline
Risk of TB infection and progression to active TB is high in children under 5 years, with rapid progression (within 12 months) in those under 2 years
HIV infection is a significant risk factor for developing TB in children under 1 year
Risk of miliary TB, TB meningitis, and extrapulmonary TB is higher in children under 5 years and immunocompromised children
Osteoarticular TB represents 1–2% of all TB cases in children
Risk of death from TB is higher in children under 2 years and those with HIV infection or severe acute malnutrition
TB treatment should not be delayed if investigations or results are not immediately available in children at high risk of TB or death
Children's resistance profile typically matches their index case; use the index case profile to guide treatment when the child's profile is unavailable

From the guideline

Verbatim

“TB treatment should not be delayed if investigations, or results of investigations, are not immediately available in children at high risk of TB or death from TB.”

— Médecins Sans Frontières, Diagnosis of Active Tuberculosis in Children: Introduction — MSF Tuberculosis, 4.1 Introduction (2026)

Editor’s perspective

Why this matters for Georgia and the region

Prof. Giorgi Pkhakadze, MD, MPH, PhD

Editor-in-Chief, Georgian Medical Journal · Chair, Public Health Institute of Georgia · WHO consultant, health and migration

As Chair of the Public Health Institute of Georgia, I recognise that childhood TB remains a critical gap in our national programme, with diagnostic delays contributing to preventable deaths in the most vulnerable children under 2 years. The MSF recommendation to initiate treatment empirically without waiting for microbiological confirmation in high-risk children is essential for Georgia, where access to paediatric TB diagnostics remains limited outside Tbilisi. I would particularly stress to Georgian clinicians the principle of using the index case's drug resistance profile to guide treatment in children, given our significant MDR-TB burden and the difficulty of obtaining sputum samples from young children. The main implementation challenge will be strengthening contact tracing systems to reliably identify index cases and their resistance patterns, which requires better integration between adult and paediatric TB services and investment in community-based case finding.

ORCID 0000-0001-7609-4515 · Perspective written for the GMJ Guidelines Library, 21 Oct 2026

Applicability

Georgia and the South Caucasus

For Georgia and the South Caucasus, where childhood TB remains underdiagnosed and the region continues transition from Soviet-era vertical TB programmes to integrated primary care models, this guidance is highly relevant. Georgian national TB programmes should consider how to implement empirical treatment protocols for high-risk children without delaying for diagnostic confirmation, particularly in rural areas with limited laboratory capacity. Contact tracing to identify index cases and their resistance profiles is essential, especially given Georgia’s burden of multidrug-resistant TB. Integration of TB screening into maternal-child health services and HIV programmes would strengthen early case detection in the highest-risk age groups identified here (under 2 and under 5 years).

Questions this guideline answers

Quick answers

At what age are children most at risk of rapid progression to active TB after exposure?

Children under 2 years are at highest risk of rapid progression to active TB, typically within 12 months of exposure. Children under 5 years also face high risk of TB infection and progression to active disease.

Should I delay TB treatment whilst waiting for diagnostic test results in a high-risk child?

No. TB treatment should not be delayed if investigations or results are not immediately available in children at high risk of TB or death from TB. The risk of death, particularly in children under 2 years, outweighs the need for diagnostic confirmation.

How do I determine drug resistance in a child when testing is unavailable?

Children often have the same resistance profile as their index case (the presumed source of infection). If the child's resistance profile is not available, use the index case's resistance profile to guide the child's TB treatment.

When are children with TB considered infectious?

Children are not generally considered infectious unless they have extensive lung involvement and/or cavitary pulmonary TB or positive smear microscopy. Most children with TB do not require isolation.

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Quality & accreditation

Same guideline

Other investigations — MSF TuberculosisChapter 3: Diagnosis and follow-up investigations
Latent tuberculosis infection — MSF TuberculosisChapter 3: Diagnosis and follow-up investigations
Active tuberculosis — MSF TuberculosisChapter 3: Diagnosis and follow-up investigations
Summary of clinical presentations of tuberculosis — MSF TuberculosisChapter 2: Clinical presentation
Clinical presentation of tuberculosis in HIV-infected persons — MSF TuberculosisChapter 2: Clinical presentation
Disseminated or miliary tuberculosis — MSF TuberculosisChapter 2: Clinical presentation

Diagnosis of Active Tuberculosis in Children: Introduction — MSF Tuberculosis

What this guideline says

Key points

From the guideline