Permafrost is a layer of frozen soil that contains many harmful viruses and bacteria that have been frozen for thousands of years, but as the Earth warms, this layer is melting, and these viruses could be unleashed on the World, Dr Zeeshan Afzal told Express.co.uk.
from Daily Express :: World Feed https://www.express.co.uk/news/us/1749709/expert-zombie-viruses-defrosting-animals-dxus