Which of the following diseases provided immunity to smallpox? a. Cow

Which of the following diseases provided immunity to smallpox?

a. Cowpox
b. Measles
c. Mumps
d. Scarlet fever

ANS: A
Those that had an infection of cowpox were thereafter immune from smallpox, which was endemic and killed about 10% of the population. Measles, mumps, and scarlet fever did not provide immunity to smallpox.

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