## TB Case Definition for Epidemiological Surveillance **Key Point:** The WHO and India's National TB Elimination Programme (NTEP) define a TB case as one confirmed by bacteriology OR diagnosed clinically by a qualified healthcare provider based on clinical and/or radiological evidence. ### Bacteriological Confirmation Methods - Sputum smear microscopy (AFB positive) - TB culture (gold standard) - Rapid molecular tests (GeneXpert MTB/RIF, TrueNat) ### Clinical Diagnosis Criteria When bacteriology is negative or not done: - Clinical symptoms consistent with TB (cough ≥2 weeks, fever, night sweats, weight loss) - Radiological findings suggestive of TB (infiltrates, cavitation) - Response to anti-TB therapy (in some contexts) **High-Yield:** This broader definition ensures that TB cases are not missed due to diagnostic limitations and captures both smear-positive (highly infectious) and smear-negative cases for public health surveillance. **Clinical Pearl:** In India's NTEP, all TB cases—whether bacteriologically confirmed or clinically diagnosed—are registered and counted for epidemiological tracking and program evaluation. ### Why This Matters for Epidemiology - Ensures uniform case identification across diverse healthcare settings - Allows comparison of TB burden across regions and countries - Guides resource allocation and treatment strategies - Enables early case detection and treatment initiation
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