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

Vaccine Adverse Event Reporting System

The Vaccine Adverse Event Reporting System (VAERS) is a national system for reporting possible adverse reactions or side effects after any US-licensed vaccine. This article explains how VAERS works and describes its strenghts and limitations.

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For Parents

This section contains easy-to-use information on each of the recommended childhood vaccines, the recommended childhood immunization schedule, tips on using the Web as a source of immunization and health information, links to other helpful sites, and pictures of vaccine-preventable diseases.

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