The Chicago Department of Public Health (CDPH) has confirmed the first two measles cases reported in Cook County in 2025.
According to city officials, one case was identified in a suburban Cook County adult with unknown vaccination status. The individual sought medical attention on Monday, April 28, and is currently in isolation.
A second case was reported in a Chicago adult with one prior dose of the MMR (measles, mumps, rubella) vaccine. This individual traveled through O’Hare International Airport in early April, experienced rash onset on April 25, and is now isolating.
The CDPH and the Cook County Department of Public Health (CCDPH) are working to identify and notify individuals who may have been exposed. The following public locations have been listed as potential exposure sites:
- Monday, April 21: Fittingly Delicious, 3939 W. Irving Park Rd.
- Tuesday, April 22: O’Hare Airport, 10 a.m.–8 p.m. (especially Terminal 1)
- Wednesday, April 23: O’Hare Airport, 10 a.m.–8 p.m. (especially Terminal 1)
- Friday, April 25: ALDI, 7235 39th St, Lyons, IL, 10 a.m.–12:30 p.m.
- Sunday, April 27: Shell Gas Station, 3901 S. Harlem Ave., Stickney, IL, 10 a.m.–12:30 p.m.
- Monday, April 28: Mobil Gas Station, 2945 S. Harlem Ave, Berwyn, IL, 10:20 a.m.–1 p.m.
With measles cases on the rise throughout the country, uncertainty persists regarding the disease and prevention measures. Here’s everything to know about the virus and how to stay safe.
What is measles?
Measles is a highly contagious respiratory virus that spreads through the air via coughing, sneezing, or breathing. According to the CDPH, up to 90% of unvaccinated individuals exposed to the virus will become infected.
Symptoms can arise up to 21 days after exposure and typically include:
- High fever
- Rash
- Cough
- Runny nose
- Watery eyes
In severe cases, measles can lead to complications such as pneumonia, seizures, hearing loss, brain damage, or death.
Who is at risk for contracting and spreading the virus?
Anyone who has not received the full measles vaccination series is at risk of contracting and spreading the virus. Most children receive two doses of the MMR vaccine between ages 1 and 6.
The CDC considers two doses of the vaccine highly effective and capable of providing lifelong immunity.
Click here to learn more about CDC’s criteria for measles immunity.
What to do if exposed?
Individuals exposed to the virus should immediately contact their healthcare provider to confirm their vaccination status.
In the event that symptoms develop, affected persons should notify their healthcare provider before going to a medical or emergency facility, so as to prevent exposure.
Unvaccinated individuals exposed to the virus should speak with their doctor about getting the MMR vaccine as soon as possible.
Where can I check my vaccination history or schedule an appointment?
Unvaccinated individuals in Chicago can schedule an appointment to get the MMR vaccine by calling Cook County Health at 833-308-1988.
Those unsure about their vaccination history can check their records by visiting the Vax Verify portal from the Illinois Department of Public Health.
To learn more about measles prevention and detection from the CDPH, click here.