Local health officials say five more people who visited Disney theme parks in Southern California last month have fallen ill with measles, bringing the number of cases in the state to a dozen.

Orange County Health Care Agency spokeswoman Nicole Stanfield says the county's six patients -- including one reported previously by the state -- visited the theme parks between Dec. 15 and Dec. 20. Stanfield says only one was fully vaccinated against the disease.

California's state health agency reported earlier this week that seven Californians and two people in Utah likely contracted measles at Disneyland or Disney California Adventure.

In Colorado, the El Paso County Public Health department said Thursday that a patient diagnosed with measles this month in Colorado Springs had visited Disneyland in mid-December.