Health officials had said earlier in the week that two children under age 1 who attended the KinderCare Learning Center in Palatine, Illinois, tested positive for the measles, and tests for the three others had been pending.
Officials aren’t sure whether the cases are linked to a multistate outbreak associated with Disneyland in California, the department said.
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Measles is a highly contagious respiratory disease. It causes fever, red and sore eyes, runny nose, cough and a rash. It can cause deadly health complications including pneumonia and encephalitis.
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.
