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- https://www.cdc.gov/smallpox/index.html
- https://wwwnc.cdc.gov/eid/article/10/5/03-0973_article
- http://www.who.int/csr/disease/smallpox/en/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1069029/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC281588/
- https://www.nationalgeographic.com/science/health-and-human-body/human-diseases/smallpox/
- https://www.nlm.nih.gov/exhibition/smallpox/sp_variolation.html
- https://www.cdc.gov/mmwr/preview/mmwrhtml/00049694.htm