Tuberculosis (TB) By Edward A Nardell, MD, Harvard Medical School Reviewed / Revised Jul 2022 | Modified Sep 2022 View Patient Education Etiology Epidemiology Pathophysiology Symptoms and Signs Diagnosis Prognosis Treatment Screening for TB Prevention Special Populations Key Points More Information Topic Resources Tuberculosis (Chest X-Ray) Dosing of Oral First-Line... Overview of Tuberculosis (TB) Tuberculosis is a chronic, progressive mycobacterial infection, often with an asymptomatic latent period following initial infection.