Read this excerpt from "Edward Jenner and the History of Smallpox and Vaccination.”

The regular practice of variolation reached the New World in 1721. . . . During the decades following the 1721 epidemic in Boston, variolation became more widespread in the colonies of New England. In 1766, American soldiers under George Washington were unable to take Quebec from the British troops, apparently because of a smallpox epidemic that significantly reduced the number of healthy troops. The British soldiers were all variolated. By 1777, Washington had learned his lesson: all his soldiers were variolated before beginning new military operations.


How is the author’s claim in this excerpt similar to previous claims about variolation in the passage?

It shows how variolation became more popular as it was proved helpful.
It shows how variolation became a standard procedure in the military.
It shows that variolation was most effective in the New World.
It shows that variolation was needed most during wartime.

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