Chronic fatigue syndrome (CFS) is a controversial disease that afflicts people with extreme and debilitating tiredness that lasts for many years and isn't relieved by rest. Its very existence is questioned by many,
but some estimates suggest that it affects up to 1% of the world's population. We don't know what causes it. Prostate cancer is one of the most common cancers in the world and kills around 221,000 people every
year. Its causes too are largely unknown. What do these two diseases have in common? They have both been recently linked to a virus called XMRV (or xenotropic murine leukaemia virus in full).
http://www.newscientist.com/article/dn17947-chronic-fatigue-syndrome-linked-to-cancer-virus.html#
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