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Glossaries
Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)
Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)
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vaccine
A prevention treatment containing weakened microbes of the kind of disease one is guarding against. It is administered to stimulate the immune system against that disease.
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Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)