WAUKEGAN, Ill. (CBS) — Fearing exposure to measles for potentially hundreds of people at a Menards store in north suburban Long Grove, the Lake County health department is setting up clinics to give out free measles shots for people who haven’t received the vaccine.

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The date in question is Sunday, February 15. Lake County Health Department’s Communicable Disease Specialist Lisa Dallmeyer said someone who was in that store from 7:55 a.m. to 3:20 p.m. has tested positive for measles, and anyone in the store during those hours – customers and employees – could have been exposed.

Dallmeyer said the health department is setting up clinics to give out measles shots “for customers and employees of the store who feel they may have been exposed.”

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The store has a total of about 200 employees. Dallmeyer would not confirm whether the person with measles — who was in the store for 7 1/2 hours — is an employee, but she said that person does not live in Lake County.

There are a total of 15 measles cases in Illinois. All are in Cook County.

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A spokesman for Menards declined to comment and referred questions to the Lake County health department.