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

Should My Child Receive the Measles, Mumps, and Rubella Vaccines Individually Rather Than as a Combination?

Some media reports have said that parents should not use the MMR vaccine but have their children immunized against measles, mumps and rubella one at a time (i.e., on three separate occasions, as long as one year apart). This is a potentially dangerous advice that increases a child's risk of being needlessly harmed by serious diseases that can be effectively and safely prevented.



Mercury in Vaccines

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