What is used to prevent a viral infection?

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Explanation:

Many of these diseases can be prevented by the use of viral vaccines, which stimulate protective immunity against the virus without causing major disease. Viral vaccines may also be used in active viral infections, boosting the ability of the immune system to control or destroy the virus.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.