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Before the measles vaccine was widely available, the measles virus was so common that virtually everyone was exposed during childhood. This widespread exposure is the primary reason why older people are considered immune to measles.
According to the Centers for Disease Control and Prevention (CDC), individuals born before 1957 are generally considered immune to measles due to widespread exposure to the virus before the vaccine was introduced. This natural immunity means most people in this age group do not need a measles vaccine if born in 1956. However, specific circumstances, such as working in a high-risk setting like healthcare or planning international travel, may require re-evaluation of immunity.
