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Two weeks of cough, evening fever, weight loss — TB; sputum CBNAAT confirms; 6-month treatment. Pulmonary TB (chronic cough >2 weeks, evening fever, weight loss, hemoptysis — upper-lobe cavitation): CBNAAT (2-hour + rifampicin resistance) → 6-month regimen (2HRZE/4HRE) via NTEP; contacts screened, Nikshay-tracked. Pneumonia (acute — fever, productive cough, consolidation: CURB-65 — confusion, urea, RR, BP, age — guides admission; CAP — co-amoxiclav/macrolide; hospital — ceftriaxone). Pleural effusion (stony dullness, breathlessness — tap: Light's criteria exudate vs transudate; TB commonest exudate in India). Pneumothorax (sudden pleuritic pain + breathlessness — tall thin: small — observe; large/tension — needle then chest drain). The 2-week cough is TB until proven — test, don't guess.