Do you know something about smallpox???
What is this desease about?
Which are their symptoms?
So, if you are interested in,
just try to answer the next questions.
Who invented the first vaccination in the world?
What was his job?
When was this vaccination invented?
What happened after this discovery occured in humanity?
If you have some doubts and you want to look into this theme
Let´s watch the following video
where everything is explained to you.