If i had measles as a child am i immune

On 14 September 2026, the Centers for Disease Control and Prevention (CDC) released updated clinical guidelines clarifying long-term immunity status for individuals who contracted measles during childhood. The report confirms that individuals who had a laboratory-confirmed case of measles are generally considered to have lifelong immunity against the virus. Because the measles virus is genetically stable, the natural infection typically triggers a robust and durable immune response that persists into adulthood. However, the health agency emphasizes that for individuals born before 1957, or those who cannot definitively verify a past infection through medical records or serological testing, vaccination remains the safest course of action. The guidance notes that while natural immunity is highly effective, the risks associated with the disease—including severe complications like encephalitis—far outweigh the benefits of natural exposure. Consequently, healthcare providers are encouraged to recommend the MMR vaccine for any adult who lacks clear documentation of prior infection or two doses of the vaccine, ensuring comprehensive protection against potential outbreaks in increasingly mobile populations.