Measles cases in the U.S. in the first three months of 2019 have already surpassed the year-end totals for every year except 2014 since ongoing transmission of measles was eliminated in this country nearly two decades ago. From January 1 to April 11, 2019, 555 cases of measles have been confirmed in 20 states, including several outbreaks. Two outbreaks have been reported in California (CA) and, as of April 10, 21 measles cases, including 13 outbreak-associated cases, have been reported (
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). The two CA outbreaks were linked to international travel followed by local transmission.
Several of the California cases were not isolated while at the hospital, leading to additional cases from exposure at hospitals. In Orange County (OC), we have evaluated several measles cases and exposures in recent weeks, although no cases have been confirmed in OC residents this year. Since measles is highly infectious, it is imperative that any suspect cases are immediately isolated, reported to Public Health, and appropriately tested (see Provider Recommendations below).