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Newly discovered gut virus lives in half the world's population -- ScienceDaily - http://www.sciencedaily.com/releases/2014/07/140724094214.htm
"Odds are, there's a virus living inside your gut that has gone undetected by scientists for decades. A new study has found that more than half the world's population is host to a newly described virus, named crAssphage, which infects one of the most common gut bacterial species, Bacteroides. This bacterium thought to be connected with obesity, diabetes and other gut-related diseases." ‎- silpol