Recently here in Hawaii we had an outbreak of Hepatitis A from uncooked scallops at 2 sushi restaurants. Hundreds got sick. Nearly 200 were hospitalized. Two died. All completely unnecessary as the vaccine has been around for 22 years! Most people have never gotten this vaccine unless they traveled to less developed countries.
As an epidemiologist, it pains me to think that so many people fall for conspiracy theories and have become anti-vaccine. With the HPV vaccine alone, for example, an estimated 50,000 girls alive today will be dead because their parents didn't vaccinate them. They will die of cervical cancer instead. One is far more likely to be injured or killed simply traveling to get any type of medical care or do anything outside the house than getting any of the approved vaccines.
This article sheds some light on the phenomenon of people insisting on their unsubstantiated belief over the expertise of those who spend their lives learning specific fields.
Why Expertise Matters : 13.7: Cosmos And Culture : NPR