CDPH Investigating Confirmed Measles Case in an International Visitor with Possible Public Exposure in Chicago

CHICAGO - The Chicago Department of Public Health (CDPH) is investigating a confirmed case of measles in an international traveler who arrived in Chicago on June 17, 2026. Based on timing of their illness, the case was exposed to measles outside the U.S. CDPH is working with healthcare partners, the Illinois Department of Public Health, and CDC to identify and notify individuals who may have been exposed.

The following has been identified as a public exposure location:

"Measles is highly contagious, but it is also highly preventable through vaccination," said acting Commissioner Fikirte Wagaw. "We are working quickly to identify anyone who may have been exposed and to ensure people have the information they need to protect themselves and their families."

CDPH is coordinating with healthcare partners to identify close contacts and determine whether post-exposure prophylaxis may be recommended for people at higher risk of measles complications.

Measles symptoms usually appear 7 to 21 days after exposure and can include high fever, cough, runny nose, red or watery eyes, and a rash that typically begins on the face and spreads to the rest of the body. Measles can cause serious complications, especially in infants and young children, pregnant people, and people with weakened immune systems.

People who believe they may have been exposed should check their vaccination status. Two doses of the measles, mumps, and rubella vaccine are highly effective at preventing measles. Individuals who were potentially exposed and are unsure whether they are protected should contact their healthcare provider to determine if they need to be vaccinated or checked for immunity. There are also specific measles vaccination recommendations for adults and children prior to international travel. The MMR (Measles, Mumps, Rubella) vaccine is available to all Chicago residents at no cost at CDPH's Immunization Clinics.

CDPH urges anyone who develops measles symptoms to call a healthcare provider before going to a medical office, urgent care, or emergency department. Calling ahead helps healthcare facilities take steps to prevent exposure to other patients and staff.

For more information about measles, visit chicago.gov/measles or contact your healthcare provider.

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