I was curious so I looked it up and found: https://www.usatoday.com/story/news/factcheck/2021/07/14/fact-check-viruses-can-mutate-become-more-deadly/7839167002

I was curious so I looked it up and found: https://www.usatoday.com/story/news/factcheck/2021/07/14/fact-check-viruses-can-mutate-become-more-deadly/7839167002/ https://www.usatoday.com/story/news/factcheck/2021/07/14/fac... The examples they give in the article are Ebola in 2016, West Nile Virus in 1999, and the Spanish flu in 1918.