Smallpox - including symptoms, treatment and prevention. Smallpox, which was once a severe disease common around the world, was.
Smallpox is an extremely contagious and deadly virus for which there is no known implemented a strict vaccination standard in order to slow the infection rate.
A person with smallpox goes through several stages as the disease progresses. Each stage has its own signs and symptoms. Open All.
Learn about the symptoms, causes and vaccine prevention of this contagious, Causes. Smallpox is caused by infection with the variola virus.