The first vaccine, developed by Edward Jenner in 1796 using material from cowpox, protected people against

Explanation

1. 01

   Jenner noticed that milkmaids who caught mild cowpox did not get smallpox.

2. 02

   His cowpox vaccine protected against smallpox. The word vaccine comes from vacca, Latin for cow. Smallpox was declared eradicated worldwide in 1980.