The authors hypothesize that there is a correlation between the percentage of CD4+ T cells expressing CD32a and/or X and the quantity of DNA found in peripheral blood mononuclear cells in patients infected with HIV-1. Also, that there is a correlation between expression of CD32a and/or X and proviral load.

Inclusion Criteria:

• Patient infected with aviremic HIV-1 (<20 copies of HIV-1 RNA/ml plasma) undergoing antiretroviral treatment for at least 2 years
• Patient has known duration of infection and treatment
• Patient has known pretherapeutic CD4+ T cell count and viremia
• Patient has known CD4+ T cell count, residual viremia and CD4/CD8 ratio for previous 2 years
• Patient weighs at least 56kg
• The patient is not opposed to their inclusion in the study
• The patient must be a member or beneficiary of a health insurance plan
• Patient at least 18 years old

Exclusion Criteria:

• Patient has an acute infection
• The subject has already been included in the study or is in a period of exclusion determined by a previous study
• It is impossible to give the subject informed information
• The patient is under safeguard of justice or state guardianship
• Patient is pregnant, parturient or breastfeeding

Patients with aviremic HIV-1 undergoing antiretroviral treatment for at least 2 years. Patients will be divided into 3 groups according to pre-therapeutic CD4+ T cell levels:

• "Low" (n=16): < 200 CD4+ T cells/mm3,
• "Medium" (n=16): 200 to 500 CD4+ T cells/mm3,
• "High" (n=16): >500 CD4+ T cells/mm3.