This was because Chinese government implemented the National Free Antiretroviral Treatment Program (NFATP) in 2003, with a “Four Free and One Care” policy (providing free HIV test and CD4+ T cell tests; free antiretroviral treatment for AIDS patients; free drugs to prevent mother-to-child transmission; free education for AIDS orphans; and government care for AIDS patients who live in poverty) [43]. This evidence concerns the gene CD4 and AIDS.