Physician adherence to isoniazid preventive therapy guidelines for HIV-infected patients in Thailand.

Isoniazid preventive therapy (IPT) has been shown to reduce the risk of active tuberculosis in tuberculin skin test (TST) positive human immunodeficiency virus (HIV) infected individuals. The World Health Organization has recommended IPT for HIV-infected patients since 1999. Physicians' non-adherence to the IPT guideline is one of the limitations to the wide spread use of IPT.