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(NEWSER)– A rare measles outbreak has been traced to Disneyland and people who visited the Anaheim theme park between Dec. 15 and 20 may have been exposed, health officials in California warn.

Nine cases have been confirmed in people ranging in age from 8 months to 21 years, most of whom were unvaccinated, and several more potential cases are being investigated, reports Reuters. People who visited the adjacent California Adventure theme park are also at risk, authorities say, as are those who visited the Parkway Plaza Mall in El Cajon, near San Diego, on Dec. 29.

Most of the cases are in California but two Disneyland visitors from Utah were also infected.

Photo: Getty Images

Read the full story on Newser.com