The National Network for Immunization Information (NNii) provides up-to-date, science-based information to healthcare professionals, the media, and the public: everyone who needs to know the facts about vaccines and immunization.

Vaccine Safety

Concerns About Vaccine Safety

Because of the success of vaccines, vaccine-preventable diseases aren’t feared anymore and concerns about vaccine safety are common. But these diseases are not gone.

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Thimerosal-Mercury

Mercury in Vaccines

This article answers the most frequently asked questions about thimerosal and its use as a preservative in vaccines.

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