- CDC Smallpox - This site offers information on smallpox causes, prevention, symptoms and treatment of the smallpox.
- Smallpox - Smallpox is an infectious disease unique to humans, caused by either of two virus variants.
- Smallpox - MayoClinic.com - A comprehensive overview covers symptoms, causes, vaccine prevention of this devastating disease.
- Smallpox: MedlinePlus - Smallpox is a disease caused by the Variola major virus.
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