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
Recently an unimmunized child was reported from Minnesota with poliovirus infection. So far, three other unimmunized children in the same community have also been identified as being infected. What is the origin of these infections?
Vaccine Components
Aluminum Adjuvants in Vaccines
Some vaccines contain chemicals called adjuvants to help stimulate the production of immunity against the vaccine ingredients, making the vaccine more effective. In the United States, aluminum salts have frequently been incorporated as adjuvants in vaccines.
News
Updates
Emergence of Avian Influenza A(H7N9) Virus Causing Severe Human Illness — China, February–April 2013
Posted: May 6, 2013
Progress Toward Eradication of Polio — Worldwide, January 2011–March 2013
Posted: May 3, 2013