Why are people born before 1957 exempt to receiving MMR vaccine?
People born in 1957 and before lived through several years of epidemic measles before the first measles vaccine was licensed. As a result, these people are very likely to have had the measles disease. Surveys suggest that 95% to 98% of those born before 1957 are immune to measles. Note: The “1957 rule” applies only to measles and mumps, and does NOT apply to rubella.
