Although members of the HIV/AIDS denialist community are united by their disagreement with the scientific finding that HIV is the cause of AIDS, the specific positions taken by various groups differ. Denialists claim many incompatible things: HIV does not exist; HIV has not been adequately isolated, HIV does not fulfill Koch's postulates, HIV testing is inaccurate, and that antibodies to HIV neutralize the virus and render it harmless. Suggested alternative causes of AIDS include recreational drugs, malnutrition, and the very antiretroviral drugs used to treat the syndrome.