Inclusion Criteria: HIV-1 infection, as documented by any licensed ELISA test kit and confirmed by Western blot at any time prior to study entry. Acute or early HIV-1 infection at the time of HAART initiation defined by HIV-1 RNA detectable with a negative serology or a negative detuned ELISA. HAART for at least 15 months and no more than 1 detectable HIV-1 RNA value (above the 50 copy/mL) for at least 6 months prior to screening.