HIV2, refers to HIV type 2. According to its different viruses, it can be divided into two categories, HIV type 1, which is distributed worldwide, and HIV type 2, which is distributed in slightly fewer regions, with HIV type 1 being more infectious and HIV type 2 being slightly less infectious. In China, mainly type 1 HIV infection, type 2 HIV can also be found since 1999. Therefore, when testing for HIV, antibodies need to be tested for both type 1 and type 2, so that HIV infection is not missed. type 2 HIV can also be detected by antibody testing if it infects a person.