For decades, the human niche for viruses related to smallpox has remained mostly empty. Since eradicating smallpox, only rare ...

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% ...

According to contemporary accounts, the president’s weakness and dizziness from the day before had worsened into a high fever and a severe headache. A few days later, he developed a rash all over his ...