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

BSE Transmission and Vaccines

The Food and Drug Administration Center for Biologics Evaluation and Research (CBER) conducted a careful review of the science relating to risk of bovine spongiform encephalopathy (BSE) transmission through use of vaccines.

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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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