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Smallpox Inspections
A young Native American boy in Yukon Territory is checked for smallpox and vaccinated against the disease in this circa-1900 photograph. Smallpox killed some 300 million people worldwide in the 20th century before it was eradicated in 1977. Today the biggest threat from smallpox comes from its possible use as a bioterrorism agent.
Photograph by W. A. Rogers

Smallpox

See smallpox photos from National Geographic.