A 3-year-old boy from a tribal village in Chhattisgarh is brought to the primary health centre with a 2-week history of cough and fever. On examination, he is underweight (weight-for-age 60% of expected), has generalized lymphadenopathy, and a firm hepatosplenomegaly. Chest X-ray shows bilateral hilar lymphadenopathy. Mantoux test (5 TU) shows 18 mm induration at 72 hours. What is the most appropriate next step in management according to RCH and NTEP guidelines?

Explanation

## Clinical Diagnosis of TB in Children This child presents with a **strong composite TB score**: - Prolonged cough (2 weeks) + fever - Malnutrition (weight-for-age 60%) - Lymphadenopathy + hepatosplenomegaly (extrapulmonary TB) - Bilateral hilar lymphadenopathy on CXR (classic TB pattern) - Positive Mantoux test (18 mm = ≥15 mm in non-BCG vaccinated or ≥10 mm in BCG vaccinated) ## NTEP & RCH Guidelines for Pediatric TB Diagnosis **Key Point:** In children, TB diagnosis is **clinical and radiological** — sputum smear microscopy is positive in <10% of pediatric TB cases because children are often "non-infectious" (paucibacillary disease). Waiting for sputum results delays treatment and increases morbidity/mortality. **High-Yield:** According to NTEP (National TB Elimination Program) guidelines, a child with: - Symptoms consistent with TB (cough ≥2 weeks, fever) - Radiological findings suggestive of TB (hilar lymphadenopathy, infiltrates) - Positive tuberculin skin test (TST ≥5 mm in immunocompromised; ≥10 mm in others) - **Should be started on anti-TB therapy without waiting for bacteriological confirmation** **Mnemonic: TB SCORE in Children** — **T**uberculin positive, **B**ilateral hilar lymphadenopathy, **S**ymptoms (cough ≥2 weeks), **C**ontact history (if present), **O**ther radiological signs, **R**isk factors (malnutrition, immunosuppression), **E**xtrapulmonary signs (lymphadenopathy, hepatosplenomegaly) ## Why Sputum Microscopy is Not Required in Children | Feature | Adult TB | Pediatric TB | |---|---|---| | Sputum smear positivity | 40–50% | <10% | | Cavitary disease | Common | Rare | | Diagnostic approach | Bacteriological confirmation preferred | Clinical + radiological | | Infectiousness | High | Low (non-infectious TB) | | Treatment delay | Acceptable if awaiting smear | **Unacceptable** — increases mortality | **Clinical Pearl:** Pediatric TB is often **paucibacillary** (low bacillary load) because children have: - Immature immune response (delayed hypersensitivity) - Smaller caseous lesions - Minimal cavitation - Poor expectoration ability Thus, sputum smear microscopy is insensitive in children and should NOT delay anti-TB therapy initiation. ## NTEP Algorithm for Pediatric TB Management ```mermaid flowchart TD A[Child with cough ≥2 weeks + fever]:::outcome --> B{TB score assessment}:::decision B -->|High score: CXR findings + TST positive + symptoms| C[Start anti-TB therapy]:::action B -->|Low score: atypical features| D[Consider alternative diagnosis]:::outcome C --> E[Intensive phase: 2 months]:::action E --> F[Continuation phase: 4 months]:::action F --> G[Treatment completion + clinical improvement]:::outcome B -->|Sputum smear positive| H[Confirm TB bacteriologically]:::action H --> I[Start anti-TB therapy]:::action ``` **High-Yield:** RCH emphasizes that **delaying anti-TB therapy in children while awaiting sputum results increases mortality and morbidity** — the clinical + radiological evidence is sufficient for treatment initiation.