HIV-2

**Definition:** An HIV species related to HIV-1 but carrying different antigenic components and with differing nucleic acid composition. It shares serologic reactivity and sequence homology with the simian Lentivirus SIMIAN IMMUNODEFICIENCY VIRUS and infects only T4-lymphocytes expressing the CD4 phenotypic marker.

**Tree numbers:** - B04.820.650.589.650.350.410

**Synonyms:** - HTLV-IV - Immunodeficiency Virus Type 2, Human - Human Immunodeficiency Virus Type 2 - Human T Lymphotropic Virus Type IV - Human T-Lymphotropic Virus Type IV - LAV-2 - HIV-II - Human immunodeficiency virus 2