Smallpox is a viral disease that infects exlusively humans. It causes extensives rashes that may become vesicular or pustular; it may also cause death.
Smallpox is spread from person to person by inhalation of air droplets or aerosols; it is highly infectious. Moreover, what is really scary is that there is no treatment for smallpox.
There is a vaccine for smallpox, but in May 1980, the World Health Organization declared the global eradication of smallpox. No vaccination or other preventive measures are necessary.
For all these reasons, smallpox is rated among the most dangerous of all potential biological weapons.
Scary!!!
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