In what seems like a plot straight out of a low-budget science-fiction film, scientists have revived a giant virus that was buried in Siberian ice for 30,000 years — and it is still infectious. Its targets, fortunately, are amoebae, but the researchers suggest that as Earth's ice melts, this could trigger the return of other ancient viruses, with potential risks for human health.
http://www.nature.com/news/giant-virus-resurrected-from-30-000-year-old-ice-1.14801
http://www.nature.com/news/giant-virus-resurrected-from-30-000-year-old-ice-1.14801