In 'State of Denial' (Nat. Med. 16, 248 (2010)), we originally stated that David Rasnick denied the existence of AIDS while serving on an advisory panel. Contrary to a report produced by the panel, Rasnick says he did not question the existence of AIDS. Rather, he says that AIDS is not contagious and is not caused by HIV. The text should have read “Rasnick was also a member of South African president Thabo Mbeki's AIDS Advisory Panel; as part of the panel, Rasnick suggested that HIV testing be outlawed and antiretroviral drugs no longer used in the country.” The error was corrected in the HTML and PDF versions of the article on 17 March 2010.