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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5607155/ https://www.livescience.com/56598-deadliest-viruses-on-earth.html https://www.statista.com/statistics/1095129/worldwide-fatality-rate-of-major-virus-outbreaks-in-the-last-50-years/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5607155/