many of the complications associated with vaccines are also caused by the natural infections those vaccines are designed to prevent. Natural infections of measles, mumps, chicken pox, and influenza can all cause encephalitis, a swelling of the brain. We do not know what the base rate of encephalitis would be in a population with no disease and no vaccination against disease. But we do know that 1 in about every 1,000 cases of measles leads to encephalitis, and that encephalitis has been reported after vaccination in about 1 out of every 3 million doses of the MMR (measles-mumps-rubella)
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