Vaccine Critics Turn Defensive Over Measles

Their children have been sent home from school. Their families are barred from birthday parties and neighborhood play dates. Online, people call them negligent and criminal. And as officials in 14 states grapple to contain a spreading measles outbreak that began near here at Disneyland, the parents at the heart of America’s anti-vaccine movement are being blamed for incubating an otherwise preventable public-health crisis.