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3d ago

First 2025 Measles Cases Confirmed in Cook County

Two adults, including a traveler through O’Hare Airport, have been diagnosed as health officials identify exposure sites and urge vaccinations.

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An illustration provides a 3D graphical representation of a spherical-shaped, measles virus particle studded with glycoprotein tubercles in this handout image obtained by Reuters April 9, 2019. Centers for Disease Control and Prevention (CDC)/Handout via REUTERS/ File Photo

Overview

  • Cook County health officials confirmed two measles cases: one in a Chicago resident who traveled internationally through O’Hare and another in a suburban resident with unknown vaccination status.
  • The Chicago case involves an adult who developed symptoms on April 25 and is isolating at home, while the suburban case was hospitalized on April 28 and isolated immediately.
  • Officials have identified six public exposure sites between April 21–28, including O’Hare Airport, a library, a restaurant, a grocery store, and gas stations in Cook County.
  • Health departments are actively notifying potential contacts and urging residents to ensure they have received two doses of the MMR vaccine, which is 97% effective against measles.
  • The resurgence of measles in the U.S. is attributed to declining vaccination rates and misinformation, with over 900 cases reported nationwide in 2025 so far.