Abstract
Smallpox is a highly contagious disease mainly transmitted by aerosols with a high case-fatality. The smallpox virus has evolved from a long adaptation to humans during Evolution, explaining that the virus is highly specific for humans and nonpathogenic for animals. Smallpox was eradicated in 1977 and vaccination was abandoned in the 1980’s. This virus is a dreadful potential biological weapon since the reemergence of smallpox on the planet might be expected to be devastating, due to its high ‘contagiosity’, which would rapidly spread in naive populations, especially those living in urban areas, and worldwide through air travels. There is no anti-viral treatment and vaccine is active in the first four days post-exposure. Today, the stocks of smallpox virus constitute one of the most dangerous threats for humanity. There is a need for improving the safety of the vaccine and to reconsider the preventive strategy to face a possible attack by smallpox virus.
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