HIV2 infections at present, are predominantly found in west Africa where it is the dominant form of HIV. In persons infected with HIV2, immunodeficiency seems to develop more slowly and to be milder, but as the disease advances, HIV2 infectiousness seems to increase. The env gp36 ectodomain is highly conserved and elicits a type-specific antibody response. Hence, most licensed diagnostic assays incorporate gp36-derived antigens to detect HIV2 specific antibodies. Alternative Names: HIV-2 protein, HIV2 gp36 antigen, HIV2, HIV-2 gp36 protein, HIV 2 protein, HIV-2, HIV 2