What are Vaccines?
What is Small Pox? Is it still there?
Disease where small boils and high fever, often deadly. Its Eradicated
What did they find from people handling Cows?
That they didnot get Small pox. They got Cow-Pox
How did getting Cow-pox save them from getting Small Pox?
The germ was a smaller version of Small pox germ, and helped fight the small pox germ