People who received the vaccine many years ago may no longer be fully protected against the virus. It is unknown how long past vaccinations stay effective. Are in a location where the virus was released as a biological weapon.Are a laboratory worker who handles the virus (rare).You are more likely to develop smallpox if you: Researchers continue to debate whether or not to kill the last remaining samples of the virus or to preserve it in case there may be some future reason to study it. Variola minor is a milder infection that rarely causes death.Ī massive program by the WHO wiped out all known smallpox viruses from the world in the 1970s, except for a few samples saved for government research and presumed bioweapons.It was responsible for a large number of deaths. Variola major is a serious illness that can be life threatening in people who have not been vaccinated.In 1980, the World Health Organization (WHO) recommended that all countries stop vaccinating for smallpox. The United States stopped giving the smallpox vaccine in 1972. However, the disease has been eradicated since 1979. People were once vaccinated against this disease. The virus can stay alive between 6 and 24 hours. It may continue to be contagious until the scabs from the rash fall off. It is most contagious during the first week of the infection. It may also be spread from bed sheets and clothing. Smallpox spreads from one person to another from saliva droplets.
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