Smallpox is a widespread contagious disease caused by two viruses Variola minor and Variola major. It is cured by smallpox vaccine. Smallpox vaccine was discovered in 1796 by English scientist Edward Anthony Jenner.
Smallpox is a widespread contagious disease caused by two viruses Variola minor and Variola major. It is cured by smallpox vaccine. Smallpox vaccine was discovered in 1796 by English scientist Edward Anthony Jenner.