<prompt> For post-exposure prophylaxis of HIV is:-Tenoir Lamivudine for 4 weeksLamivudine Ritonavir for 4 weeksZidovudine Lamivudine Indinavir for 4 weeksSingle dose Zidovudine Lamivudine Indinavir  <response>: New post-exposure guidelines for HIV for adolescents and adults: Preferred backbone regimen: Tenofovir Lamivudine for 4 weeks. Preferred third drug: Lopinavir Ritonavir or Atazanavir Ritonavir. 