Immune System Vocabulary

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Immune System

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The body's defense system that fights off infections and diseases.

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Infect

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To transmit a disease or pathogen to a person, animal, or plant, causing illness.

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Protect

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To keep safe from harm or injury.

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Symptom

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A sign or indication of a disease or condition, often felt by the person affected.

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Vaccine

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A substance used to stimulate the production of antibodies and provide immunity against diseases.

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Virus

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A microscopic infectious agent that replicates only inside the living cells of an organism.