Officials say it is not clear whether these cases are linked to a previously confirmed case in suburban Cook County or to the outbreak associated with Disneyland in California.
In light of the ongoing debate over childhood vaccinations, agencies are taking extra precautions to limit the spread of the measles.
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Measles is spread by contact with an infected person through coughing or sneezing. It can remain in the air and on surfaces for up to two hours.
