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V

Vaccine--A substance injected into the body to stimulate resistance to a specific disease.

Vagina--A female reproductive organ. Also called the birth canal.

Virus--Tiny living organisms that invade cells, alter the cells' chemistry and cause them to produce more viruses. Viruses are the cause of many diseases. In animals, several viruses have been shown to produce cancer. Their role in the development of cancer in man is now being studied.




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