Officials said they aren’t yet sure what the source of the outbreak was, nor do they know if it is linked to the cases stemming from Disneyland.

Five babies under age 1 have been diagnosed with measles in a cluster linked to a day care center in suburban Chicago.

A baby is given an MMR injection. Rebecca Naden / Reuters

Lab testing has confirmed that two of the children have the disease and results are pending for the other three, the Illinois Department of Public Health and the Cook County Department of Public Health said in a statement provided to BuzzFeed News.

However, the three children whose labs results are pending have been diagnosed based on “clinical and epidemiological criteria,” the statement said.

Four of the babies live in Cook County, Illinois, while the fifth lives in Chicago. They all have been linked to a KinderCare Learning Center in Palatine, Illinois.

Officials said they aren’t yet sure what the source of the outbreak was, nor do they know if it is linked to the outbreak stemming from Disneyland.

The state confirmed last month that a resident had been diagnosed with measles in Springfield, Illinois. Officials said they are not sure if the day care outbreak is linked to the previous case.

All unvaccinated persons at the day care facility have been ordered to stay home, the statement said.

Cases of the once nearly eradicated virus have been cropping up since December of last year.

The outbreak was sparked by exposure at Disneyland in Anaheim, California. Cases of the virus have steadily been on the rise as vaccine rates decline.

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