Managing a clinical trial in an emergency

In 1796 Edward Jenner successfully used cowpox to vaccinate against smallpox. How many years later did Louis Pasteur develop the next vaccine for humans?

Correct! Wrong!

Managing a clinical trial in an emergency
Correct!
You're right! Louis Pasteur developed the rabies vaccine for humans 89 years later in 1885.

Source
Sorry!
Actually, Louis Pasteur developed the rabies vaccine for humans 89 years later in 1885.

Source