Word: before1957
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...addition, Weingarten said many of those vaccinated in the '60s and early '70s may not be resistant to the disease, either because the immunizing agent was not of good quality or more likely because the students were too young when immunized. As a result, he cautioned that everyone born before1957 who has never had measles and who has notbeen vaccinated since 1980 should be immunizedagain...
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