Question

the first developed vaccine protected against ____________. this disease is now errradicated. smallpox measles cholera polio

Explanation:

The first vaccine was developed by Edward Jenner in 1796 to protect against smallpox. Through global vaccination efforts, smallpox was declared eradicated by the World Health Organization in 1980. Measles, cholera, and polio are still prevalent in some parts of the world, although significant progress has been made in their control through vaccination.

Answer:

smallpox