The study examined how non-medical exemption laws for vaccines required for school or daycare entry impact the incidence rates for the five diseases targeted by the vaccines, and finds that increased levels of vaccinations could reduce whooping cough cases, but did not have a statistically significant impact on the average incidence for measles, mumps, Hib and Hepatitis B.

This LawAtlas map provides information about the states where health care professionals who provide free services are immune from civil liability, and whether the immunity is limited to state employees. It also provides information about how a provider could lose their immunity.