Chemotherapy of TB can be divided into treatment of latent infection and treatment of active disease.

Latent TB Infection
As at least 20 million Thais have latent TB infection, so it is just impossible to treat every Thai with latent infection.  Treatment should be targeted to those with or without HIV infection who have recently been infected with TB and those in close contact with patients with active pulmonary or laryngeal tuberculosis.  Before beginning therapy, all persons should undergo chest radiography and clinical evaluation to rule out active TB.  Diagnosis of latent TB infection can be done by a tuberculin ...