There are two forms of smallpox: variola major, which is the more severe form, and variola minor, which is less common and generally less severe. Variola major had a mortality rate of about 30% ...

By William J. Broad In 1999, William J. Broad and two colleagues wrote a comprehensive article on the past, present and future of the smallpox virus. Feb. 12, 2025 President Trump’s order that ...