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Elimination of endemic measles in the U.S. was documented in 2000 and elimination of endemic rubella and congenital rubella syndrome (CRS) was documented in 2004. To determine whether elimination has been sustained, the CDC convened an expert panel to review all cases of measles from 2001–2011 and cases of rubella and CRS from 2004–2011.
Cases were examined for evidence of importation and source of infection. Analysis of genotype data from a third of the isolates demonstrated varying genotypes from year to year. Of the 911 measles cases, half were associated with outbreaks, the majority was in infants aged 6 to 11 months, 65% of cases were in unvaccinated individuals, and 88% were imported or linked to an imported case. Of the 77 reported ru…