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The earliest known reference to the phenomenon of immunity is from the Ancient Greek historian Thucydides, who wrote about the Peloponnesian War between Athens and Sparta during the years 430-411 BC. During an outbreak of the plague, he noticed that those who had recovered from the plague could attend to the sick because they would not contract the disease a second time.

If the Latin term immunis means ‘exempt from,’ then which choice below is the BEST definition of immunity?

A

The state of having been exposed to the plague.

B

An individual has never been exposed to the plague.

C

The state of being resistant to reinfection with the plague.

D

The state of being resistant to infection with the plague.

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