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

Post-Polio Syndrome, Vaccine-Associated Paralytic Polio and Poliomyelitis Elimination

In 2005, an unimmunized child was reported from Minnesota with poliovirus infection. At the time of this study, three other unimmunized children in the same community had also been identified as being infected. What was the origin of these infections?


For Professionals

This section includes links to general immunization recommendations in the United States and other valuable information for health professionals.