Smallpox is the most deadly disease in our species' history. Variola virus causes this disease and humans are the virus' only natural host. It is transmitted person-to-person, most commonly through the air. Infected people exhale the virus from blisters in their mouth, and anyone who comes within 10 feet of a smallpox victim can inhale the aerosolized virus and catch the disease. There are no currently available anti-viral measures that doctors can use to treat smallpox. Antibiotics don't work. Vaccination, however, protects a person from contracting this disease. More than 300 million people died from smallpox from 1900 to 1978, … Continue reading How To Vaccinate Yourself