HIV/AIDS denialists often resort to special pleading to support their assertion, arguing for different causes of AIDS in different locations and subpopulations. In North America, AIDS is blamed on the health effects of unprotected anal sex and poppers on homosexual men, an argument which does not account for AIDS in drug-free heterosexual women who deny participating in anal sex. In this case, HIV/AIDS denialists claim the women are having anal sex but refuse to disclose it. In haemophiliac North American children who contracted HIV from blood transfusions, the haemophilia itself or its treatment is claimed to cause AIDS. In Africa, AIDS is blamed on poor nutrition and sanitation due to poverty. For wealthy populations in South Africa with adequate nutrition and sanitation, it is claimed that the antiretroviral drugs used to treat AIDS cause the condition. In each case, the most parsimonious explanation and uniting factor – HIV positive status – is ignored, as are the thousands of studies that converge on the common conclusion that AIDS is caused by HIV infection.