HLA-B and AIDS: We here describe two HIV-infected adults who express both HLA-B*27:05 and HLA-B*57:01, the most protective HLA class molecules against HIV disease progression, one of whom is a typical long-term non-progressor, maintaining low-to-undetectable viral loads over more than a decade of follow up, whilst the other is a rapid progressor, whose CD4+ T cell decline from immune control of HIV to AIDS occurs within a period of 3 years.