Measles Cases in Alameda County and California

As of January 8, 2015, Alameda County Public Health Department (ACPHD) has confirmed one case of measles in 2015, and is investigating two additional suspect cases. These cases were likely exposed during a visit to Disneyland or Disney California Adventure Park 12/17-12/18/14. As of 1/6/15, an additional six cases have been confirmed in California with similar exposure, and three others are under investigation in CA and Utah. All patients reported visiting Disneyland or Disney California Adventure Park in Orange County, California between December 15th and December 20th, 2014. Confirmed CA cases range in age from 8 months to 21 years. Of the seven confirmed CA cases, six cases were unvaccinated for measles (two were too young to be vaccinated, and one had received appropriate two doses of MMR vaccine). Several large contact investigations are ongoing. It is likely that a person infectious with measles was at Disneyland or Disney California Adventure Park on these dates. However since persons can be infectious with measles for 9 days we cannot rule out the possibility of additional exposure dates or venues.

Think of measles in patients with a fever and rash, especially with a history of travel or exposure to returning travelers or measles patients. Although most measles cases occur in unvaccinated patients, cases have occurred in patients who reported a history of MMR vaccination.

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