"The ancient pathogen Pithovirus sibericum (class of giant viruses) was discovered buried 30m down in the frozen ground. The virus infects amoebas. The last time it infected anything was more than 30,000 years ago" (http://www.bbc.com/news/science-environment-26387276). What is the risk of such a pathogen recovering for plants and animals/humans? Is there any model that can estimate part of current pathogens' gene pools buried in Siberian/Canadian frozen soils to be released after melting in the near future?

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