"People born before 1957 are presumed to have lifelong immunity because measles was so contagious that almost everyone contracted it before age 15. Unless there are special circumstances, they probably don't need a vaccine now.
Most people born after 1957 would have received the shot as children, so they should be set for life. Physicians and public health experts don't recommend most people in this group get a second measles shot, though there are exceptions..."
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