Viruses, Plagues, And History

More people were killed by smallpox during the twentieth century--over 300 million--than by all of the wars of that period combined. In 1918 and 1919, influenza virus claimed over 50 million lives. A century later, influenza is poised to return, ongoing plagues of HIV/AIDS and hepatitis infect millions, and Ebola, Zika, and West Nile viruses cause new concern and panic.