What is a vaccination? It's not A
a) an injection of a chemical formula that forms a shield around bacteria
b) an injection of a full-strength form of bacteria that causes a disease
c) an injection of weakened bacteria that creates immunity to a disease
d) an injection of blood taken from another person who has no bacteria
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What is a vaccination? It's not A
a) an injection of a chemical formula that forms a shield around...
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