This observational study will aim to determine long-term atazanavir experience in a high HIV caseload primary care practice in Sydney, Australia.

This observational study will aim to determine long term atazanavir experience in HIV-1 infected patients in a primary care setting.

3. OBJECTIVES OF THE STUDY i. Primary objective Long-term (2 years or greater) atazanavir experience in HIV-1 infected patients in a primary care setting through retrospective data collection.

ii. Secondary objectives

1. To illustrate long term therapeutic efficacy of atazanavir in ART naïve and experienced HIV-1 infected patients.
2. To illustrate long term tolerability to atazanavir in ART naïve and experienced HIV-1 infected patients.
3. To identify ART treatment history in ART naïve and experienced HIV-1 infected patients on ATV.
4. To identify contraindicated therapy in ART naïve and experienced HIV-1 infected patients on ATV.

Inclusion Criteria:

1. HIV-1 positive
2. Have commenced ATV between 2002-2008 (Baseline)
3. Follow-up data (clinical and laboratory) available from baseline

Exclusion Criteria:

1. Patients not commenced ATV between 2002-2008
2. No follow-up data (clinical and laboratory) available from baseline
3. Patient 'lost to follow-up' with < 2 years of follow-up data (Clinical and laboratory)

Cohort of HIV-1 positive patients attending Holdsworth House Medical Practice who have commenced ATV as a component of ART will be identified from review of current database.

Data will be collected retrospectively from patient electronic medical records for HIV-1 positive patients that have commenced ATV from year 2002 - 2008.