Unvaccinated people have been the trigger for recent outbreaks of measles, mumps, whooping cough and chicken pox. Vaccines are not 100% effective, overall being about 90% effective. On the other hand, for some diseases the risk of contracting the disease is 90% when an unvaccinated person comes into contact with an infected person.

One pediatrician refuses to keep children with parents who left the child unvaccinated and have no plans to vaccinate the child vaccinated in his practice. He feels that if you think that he is lying about the need for vaccination, why would you trust his opinion on other issues. From past conversations with parents who refuse to vaccinate their children that there is little chance of changing opinions. His conclusion is supported by a study study in the journal Pediatrics. Anti-vaxxers cannot be swayed

In another article, he notes the risk the unvaccinated children pose to the other children. In the current measles epidemic in NYC, exposure to the unvaccinated child came at the pediatrician's office.

Measles was thought to be eradicated from the US in 2000. Now pediatricians have to retrieve their knowledge of preventable disease from the level of rare, exotic disease to active threats. Almost 90% of measles cases are found to be due to unvaccinated people.

Outbreaks of vaccine-preventable disease are occurring in Canada and England again related to decreased levels of vaccination. It seems that the refusal to face the facts is as high among the anti-vaxxers as it is among the climate change deniers.