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In 2005, mumps formally was on target for elimination from the U.S. by 2010, but despite high rates of vaccination, small outbreaks continue to occur. What's going on?
CDC researchers measured antimumps immunoglobulin G (IgG) in more than 15,000 U.S. participants (age range, 6–49 years) in the National Health and Nutrition Examination Survey (NHANES) between 1999 and 2004. The overall prevalence of detectable antibody was 90%. Antibody prevalence was higher among participants born between 1949 and 1956 than among any of the younger cohorts; prevalence was higher in women than in men, among U.S.-born blacks than among other ethnicities, and in Mexican-Americans not born in the U.S. than in those born in the U.S. Only 86% of participants born …