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Cowpox - Wikipedia
Cowpox | Cause, Symptoms, & Treatment | Britannica
The chilling experiment which created the first vaccine - BBC
Cowpox - DermNet
History of smallpox: Outbreaks and vaccine timeline - Mayo Clinic
Cowpox in Cattle - Merck Veterinary Manual
History of smallpox vaccination - World Health Organization …
The Disease Ecology, Epidemiology, Clinical Manifestations, …
Smallpox: Background, Etiology, Epidemiology - Medscape
Smallpox Vaccine - Children's Hospital of Philadelphia