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The day of a successful vaccination – level 1

14-05-1796

Smallpox is a very dangerous illness. It kills people. Cowpox is...



The day of a successful vaccination – level 2

14-05-1796

Smallpox was a very dangerous disease which killed millions of people....



The day of a successful vaccination – level 3

14-05-1796

Smallpox was a deadly and highly infectious disease that had killed...