Why some adults may need another dose of measles vaccine

The U.S. is experiencing a rise in measles cases, with 121 reported infections in 17 states this year, prompting concerns about a disease that was declared eliminated in the country in 2000. Falling vaccination rates and global increases in cases are fueling questions about immunity for older adults. Those born before 1957 are usually considered immune, but those born after may need to confirm their vaccine history. The measles vaccine is highly effective, with two doses providing up to 97% protection. Experts recommend getting vaccinated if unsure of immunity, as measles can have severe complications and hospitalization rates are rising, especially among adults.

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