Question

question # 12
multiple choice
the first vaccination was developed by ____.
using a culture of cowpox to prevent smallpox
using sheeps blood to prevent illness
using a culture of typhus to cure scurvy
using an elixir of fruit juice to prevent typhus

Explanation:

El primer intento exitoso de vacunación fue realizada por Edward Jenner, quien utilizó una cultura de viruela del ganado para prevenir la viruela humana.

Answer:

using a culture of cowpox to prevent smallpox