Smallpox DNA found in the bodies of people who lived in the Viking era show that these viruses were different to the one eliminated in the 20th century – and perhaps much less deadly
Source:
https://www.newscientist.com/article/2249835-dna-from-viking-people-reveals-the-unexpected-history-of-smallpox/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home