A 28-year-old male factory worker from Delhi presents to the occupational health clinic with a 3-week history of persistent cough, fever, and night sweats. Chest X-ray shows an upper lobe infiltrate with cavitation. Sputum smear microscopy is positive for acid-fast bacilli (AFB). His HIV status is negative. He lives in a crowded hostel with 8 other workers in a single room. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This is a smear-positive pulmonary TB case with clear epidemiological risk (crowded living) and clinical-radiological findings consistent with active disease. The patient meets all criteria for diagnosis of TB and requires immediate action. ## Why Initiate ATT Immediately **Key Point:** Smear-positive TB is infectious and poses a public health threat. Delaying treatment increases transmission risk and worsens individual prognosis. **High-Yield:** According to NTEP (National TB Elimination Program) guidelines and WHO recommendations, treatment should begin immediately upon diagnosis in smear-positive cases — do not wait for DST results. ## Contact Tracing Rationale **Clinical Pearl:** Smear-positive patients are highly infectious. The hostel setting with 8 co-residents represents a high-risk contact group. Contact tracing must begin simultaneously with treatment initiation to identify secondary cases early. ## Management Algorithm ```mermaid flowchart TD A[Smear-positive TB confirmed]:::outcome --> B{Infectious status?}:::decision B -->|Yes, smear+| C[Initiate ATT immediately]:::action C --> D[Isolate/separate from contacts]:::action D --> E[Contact tracing in household/workplace]:::action E --> F[Prophylaxis for close contacts]:::action B -->|No, smear-| G[Start ATT, lower priority for isolation]:::action C --> H[Arrange DOT in community/clinic]:::action H --> I[DST sent in parallel, not a barrier to treatment]:::action ``` **Mnemonic:** **FAST** — **F**irst-line ATT, **A**rrange DOT, **S**earch contacts, **T**reat contacts prophylactically. ## Why Not Wait for DST? DST takes 2–4 weeks. Delaying treatment: - Increases infectivity window - Worsens patient outcomes (mortality risk) - Violates public health principle of early case management - DST is sent *in parallel* with treatment, not as a prerequisite [cite:Park 26e Ch 7]