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What are preservatives and why are they used in vaccines?

April 26, 2017preservatives Used vaccines

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What are preservatives and why are they used in vaccines?

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Preservatives are used to prevent the growth of bacteria and fungi in vaccines. Contamination by germs in a vaccine could cause serious illness or death. Thimerosal is a mercury based preservative that has been used for decades in the United States to prevent the growth of microorganisms.