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.

Immunization Issues

Seasonal and Pandemic Influenza

What is the difference between seasonal and pandemic influenza? What is the role of bird and swine flu viruses in a potential pandemic?

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Immunization Science

Impact of Rotavirus Vaccine in Gastroenteritis Hospitalizations

This study describes the reduction in acute gastroenteritis hospitalizations among children after introduction of rotavirus vaccine in the United States.

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