The purpose of this study is to study the HIV disease progression in HIV-infected Thai Adult.

This is a multicenter, observational prospective cohort study. All HIV-infected patients from Bamrasnaradura Institute, Sanpatong Hospital and HIV-NAT, Thai Red Cross AIDS Research Centre, are followed to assess HIV disease progression.

Inclusion Criteria:

1. There is evidence that HIV infection true (blood positive results by ELISA (ELISA) has been confirmed or detected evidence co-infection. HIV in the body by PCR, HIV-RNA PCR).Currently on PI regimens
2. Signed consent form
3. Age> 18 years

Exclusion Criteria:

1. Patients who came for treatment in a department other than out patient, such as inpatient or emergency room.
2. Patients are not willing to receive treatment on a regular basis in all 3 hospitals as patients normally receive treatment at other hospitals on a regular basis. However, due to urgent events. Need to receive treatment in hospital and three of.
3. Patients who have been diagnosed by doctors as a Psychological disorder that can not store the data.
4. Patients who have been diagnosed by a medical condition that Alcoholism

HIV-infected patients currently receiving ART at Bamrasnaradura Institute, Sanpatong Hospital or HIV-NAT, Thai Red Cross AIDS Research Centre, Bangkok.