In 1775, Washington deployed colonial soldiers who had survived smallpox to retake Boston during a city-wide epidemic.

Inoculation effectively eliminated smallpox as a threat to American troops, ending outbreaks that had removed large numbers ...

At the turn of the 20th century, a vaccine had been developed for smallpox, a virus that killed millions in the 1800s. Those who survived the disease were often left badly scarred or blind. The ...