Few inventions in the world have truly had the impact of vaccines, and millions of lives have been saved from a horrible death or a debilitating disease because of vaccines. The world's first vaccine was the smallpox vaccine. Prior to its invention, millions of people died from this disease or suffered severe complications such as blindness, and it has now been totally eradicated. Vaccines come in several different forms, and each works in a different way to combat a disease.
Some vaccines are
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