the animal was a cow and the vaccine was discovered by Edward Jenner who cured small pox as well
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Events that led to Edward Jenner's discovery of the smallpox vaccine.(APEX)
Microscopes were what lead to the discovery of cells!
an apple. is this a joke? I'm a kid, and I know that.
The difference between a vaccine and a booster is the time it is given. A vaccine is primarily referred to as the first dose of a medicine to prevent disease. A booster is a dose given after the initial dose to strengthen the effect of the first dose.
Polio was the vaccine being worked on. It was discovered by Jonas Stalk in 1952. He depleted many cases of the disease.