The current controversy over whether parents should be forced to have their children vaccinated for measles is one of the painful signs of our times. 

Measles was virtually wiped out in the United States, years ago. Why the resurgence of this disease now?

The short answer is that false claims, based on other false claims, led many parents to stop getting their children vaccinated against measles.

The key false claim was that the vaccine for measles caused an increase in autism. This claim was made in 1998 by a doctor writing in a distinguished British medical journal, so it is understandable that many parents took it seriously, and did not want to run the risk of having their child become autistic.

Fortunately, others took the claim seriously in a very different sense. They did massive studies involving half a million children in Denmark and 2 million children in Sweden.

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