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?