4 That year, the Centers for Disease Control and Prevention (“CDC”) announced that the number of reported cases of measles for the first five months of 2014 in the United States was the highest since measles elimination was documented in 2000. 3 Yet, the number of cases climbed to 667 in 2014. 2 Rates in the United States fell to well below 100 cases per year in eight of the nine years between 2002–2010. 1 Those rates plummeted after the vaccine became available nationwide, dropping even more precipitously after adoption of a two-dose regimen in the early 1990s. Prior to the introduction of the measles vaccine in the United States in 1963, rates of infection as high as one half million persons annually were reported in the U.S.
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