Which Diagnostic Procedure Is Most Appropriate to Confirm the Suspected Infectious Disease in This Patient

a 45-year-old Male Patient Presents with a Persistent Cough, Night Sweats and Unintentional Weight Loss. He Has a History of Intravenous Drug Use and Multiple Sexual Partners. the Patient Has a Positive Tuberculin Skin Test and a Chest X-ray Shows Infiltrates in the Upper Lobes of the Lungs. the Healthcare Provider Suspects an Infectious Disease