a mild case of the disease teaches your body to fight it. - 4, Test - 3, Observation - 1, Gave 1st cow pox then small pox to a young boy - 3, Having cow pox protects you from small pox - 2, Milk maids who had had cowpox didn't catch small pox - 1, Vaccination - 4, Theory - 2,

Jenners work

by Anonymous
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