As part of the ongoing measles outbreak linked to Disney theme parks in California, over 50 people across six states were reported to have measles from January 1–16, 2015.

The total now stands at 59 confirmed measles cases since the end of December 2014. Of the total cases, 42 have been linked to an initial exposure at Disneyland or Disney California Adventure Park, which includes five Disney employees. Vaccination status was obtained for 34 of the 59 cases; 29 were unvaccinated, one had received one dose and five had received ≥2 doses of the vaccine.

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Measles is a highly contagious airborne disease that initially presents with malaise, cough, coryza, conjunctivitis, and a pathognomic enanthema (Koplik spots) followed by a maculopapular rash. Patients are considered contagious from four days before and after the rash appearance.

The Centers for Disease Control and Prevention (CDC) recommends immunization of the MMR vaccine with the first dose at 12–15 months, and the second dose at 4–6 years of age (or at least 28 days after the first dose). Students at post-high school institutions without evidence of measles immunity require two doses of the MMR vaccine. Adults born during or after 1957 without evidence of measles immunity should receive at least one dose of the MMR vaccine.