A 28-year-old woman with known HIV infection (CD4 count 180 cells/μL) presents with a 2-week history of cough and dyspnea. Chest X-ray shows bilateral lower-lobe infiltrates with minimal cavitation. Sputum smear microscopy is negative on three occasions. GeneXpert MTB/RIF is positive for Mycobacterium tuberculosis (rifampicin-sensitive). What is the most appropriate next step?

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