The Moderna vaccine seems like it could save lives, but epidemiologists worry that anti-vaccination advocates may discourage people from receiving it.
The doctor who has issued the most vaccine exemptions in the San Diego area has been charged with gross negligence for granting an exemption to a four-year-old based on "irrelevant family medical history" and inadequate documentation.
The anti-vaccine lobby has only grown more powerful as measles spreads across the U.S. Unless congressional action is taken, other vaccine-preventable diseases are likely to rise.
The percentage of American children under two years of age who have received no vaccinations has quadrupled since 2001.
Anti-vaccine activities appear to be more of a western phenomenon, especially in the Pacific Northwest and American Southwest.
Researchers analyzed posts on popular anti-vaccine Facebook pages.
"It's a little different," Liff said. "My patients eat dirt. They eat poop."
Did 108 people really die from measles vaccines in the past decade? No, but don't tell anti-vaxxers that.
A rash of measles cases in Colorado, Utah and Washington State and California have been traced back to the popular theme park.