Abstract:
Lombardi et al. (Reports, 23 October 2009, p. 585) reported an association between the human gammaretrovirus XMRV and chronic fatigue syndrome. However, their results may be misleading because of various potential sources of bias and confounding. If real, the association may lack generalizability because of the specific characteristics of the cases studied and could be due to reverse causality.
Comment on: Detection of an infectious retrovirus, XMRV, in blood cells of patients with chronic fatigue syndrome. [Science. 2009]
You can read the rest of this comment here: http://science.sciencemag.org/content/328/5980/825.1.full
Source: Sudlow C, Macleod M, Al-Shahi Salman R, Stone J. Comment on “Detection of an infectious retrovirus, XMRV, in blood cells of patients with chronic fatigue syndrome”. Science. 2010 May 14;328(5980):825; author reply 825. doi: 10.1126/science.1183545. http://science.sciencemag.org/content/328/5980/825.1.full (Full article)