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Does a 70 year old need a measles vaccine? Understanding immunity based on birth year

According to the Centers for Disease Control and Prevention (CDC), most adults born before 1957 are considered to have natural immunity to measles, meaning a 70 year old typically does not need a measles vaccine. This is because measles was a common childhood illness before the vaccine was widely available, and exposure to the virus provides lifelong protection. However, certain exceptions apply, particularly for healthcare workers or individuals with unclear vaccination histories.