Five babies under the age of 1 have been infected with measles in a cluster at a suburban Chicago daycare center, officials said Thursday.
They said it's not yet clear if the outbreak is linked to the Disneyland measles outbreak, which has spread to dozens of people in at least 14 states.
"We do expect that there will be more cases associated with this daycare," Dr. Kiran Joshi of the Cook County Department of Public Health told a news conference.
"At this time, the source of infection for the children is not known. Health officials have taken extra precautions to limit the spread," Illinois Department of Public Health and the Cook County Department of Public Health said in a joint statement.