Measles outbreak reported in Douglas County
What you need to know and do
•September 9, 2026•
by Angela Hogan
On September 2, the Illinois Department of Public Health (IDPH) announced a measles outbreak in Douglas County. Area residents are encouraged to understand how measles spreads, recognize its symptoms, and make sure they and their loved ones are protected.
Why is it called an Outbreak?
On September 2, the IDPH announced that four confirmed, linked cases of measles had been identified among Douglas County residents.
An outbreak is defined as three or more cases connected through a common exposure. This outbreak comes during a year of increased measles activity nationwide.
IDPH is working with local health departments and healthcare providers to identify people who may have been exposed to the illness. Local health departments are providing testing, vaccination opportunities, and guidance for these individuals and the public.