different types of hiv virus
There are two major types of the human immunodeficiency virus. HIV-1, which was discovered first, is the most widespread type worldwide. HIV-2 is more than 55% genetically different from HIV-1.IV-1 and HIV-2. 1  HIV-1 and HIV-2 are the two main types of HIV. 2  HIV-1 is the most widespread type worldwide. 3  Large genetic differences between HIV-1 and HIV-2 mean that tests keyed to one will not reliably detect the other.