Immuno-Virological Efficacy of Combination With Trizivir +Tenofovir in Multiresistant HIV Patients

Inclusion Criteria: 1. Age\>= 18 years. 2. HIV-1 infected patients. 3. Patients on antiretroviral treatment including NTRI + PI +/- NNRTI +/- fusion inhibitors at inclusion in the study. 4. Virological failure, defined as 2 determinations with viral load \>1,000 copies/mL in the last 6 months, during stable HAART therapy over the previous 6 months. 5. Genotype or phenotype resistance to three families of antiretrovirals (PI, NTRI and NNRTI) demonstrated in genotype study carried out in the last 48 weeks and defined as: * 3 or more TAMS of the following: M41L, E44D, D67N, V118I, L210W, T215Y/F, K219Q/E. * Existence of the M184V mutation or probable presence in the cellular archives. * 5 or more mutations that confer resistance to PI of the following: I10F/I/R/V, V32I, M46I/L, I54V/M/L, V82A/F/T/S/V, I84V/A/C, L90M. * Existence of 1 or more mutations that confer resistance to NNRTI, or probable presence in the cellular archives of: K103N, Y181C/I/Y, G190S/A/G. 6. CD4 lymphocytes \>- 300 cells/mm3 in the last two determinations. 7. Subject able to follow the treatment period. 8. Acceptance of the study and signature of the informed consent form. 9. Women may not be of fertile age (defined as at least one year from menopause or undergoing any surgical sterilisation technique), or must undertake to use a barrier contraceptive method during the study. Exclusion Criteria: * Suspicion of previous incorrect adherence. * Pregnancy or breastfeeding * Suspicion of intolerance to any investigational drug. * Record of any disease which, according to clinical criteria, may reoccur with the proposed change of therapy (sarcoma, lymphoma, etc). * CD4 Nadir below 200 cel/mm3. * Acute intercurrent disease or fever in the 15 days before inclusion.