Smallpox could return as Siberia’s melting permafrost exposes ancient graves

Smallpox could return as Siberia's melting permafrost exposes ancient graves

Last known case of the deadly disease was in Somalia in 1977, but Russian scientists investigating an anthrax outbreak have found the virus's DNA in corpses once entombed in the frozen ground. By Ian Johnston. (Aug. 16, 2016)

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