This Article-in-Press has been withdrawn pending the results of an investigation. The editorial policy of Medical Hypotheses makes it clear that the journal considers "radical, speculative, and non-mainstream scientific ideas", and articles will only be acceptable if they are "coherent and clearly expressed." However, we have received serious expressions of concern about the quality of this article, which contains highly controversial opinions about the causes of AIDS, opinions that could potentially be damaging to global public health. Concern has also been expressed that the article contains potentially libelous material. Given these important signals of concern, we judge it correct to investigate the circumstances in which this article came to be published online. When the investigation and review have been completed we will issue a further statement. Until that time, the article has been removed from all Elsevier databases. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.