The Arizona Department of Health Services, Maricopa County Department of Public Health and Pinal County Public Health Services District have confirmed 11 cases of the measles in state residents.
Officials have also expanded potential sites of public exposure, where thousands of people could have come in contact with the virus, according to a local ABC News affiliate.
Cara Christ, MD, director of the Arizona Department of Health Services, said, "This is an evolving situation, and given how contagious measles is, public health will continue to update our communities on places of potential exposure...people who have a rash and fever must call their healthcare provider or emergency department before going to let them know they may have measles. This is vital to help stop the further spread of the disease."
According to the CDC, a single dose of the measles, mumps and rubella vaccine is 93 percent effective at preventing the measles.
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