An article from BCC on 4th May talking about how climate change could possible melting permafrost soils that have been frozen for thousands of years, and as the soils melt they are releasing ancient viruses and bacteria that, having lain dormant, are springing back to life. This is the possible evidence to point out that in the future,will would be dangerous for all of us and seem likely that flood would make it more severe.

http://www.bbc.com/earth/story/20170504-there-are-diseases-hidden-in-ice-and-they-are-waking-up