CHICAGO (AP) — Health officials say the measles case count in Illinois has climbed to 14.

Illinois Department of Public Health spokeswoman Melaney Arnold said Tuesday that another infant from a Palatine day care is the most recent confirmed case in the outbreak.

READ MORE: Woman Dead, Child Among 3 Injured After House Fire In Clearing

All 14 cases have been in Cook County, with 2 adults and 12 infants affected. Thirteen of the 14 cases have been associated with a KinderCare Learning Center in Palatine.

READ MORE: Jury Selection Begins In Jussie Smollett Trial

Measles is a highly contagious viral disease that causes a rash and fever. It can be dangerous, especially to young children. Vaccination is the best way to prevent measles.

Health officials are still investigating possible causes for the cluster of cases.

MORE NEWS: Bullets Strike St. Anthony Hospital In Lawndale; No Injuries Reported

(TM and © Copyright 2015 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)