The measles outbreak in Wisconsin is now extending beyond the southwest section of the state. On Tuesday, health authorities reported a case in Chippewa County, which was the third different county to record measles in just one week. This most recent case has brought the total number of measles cases in Wisconsin in 2026 above 170.
The Outbreak Is Moving
The majority of the cases in Wisconsin have been connected with a big cluster in Grant and Lafayette counties. However, the outbreak in Chippewa County seems to be unrelated and authorities are still attempting to determine how the individual became infected. Recently, Vernon and Marathon counties have also reported new cases, indicating that the virus is spreading to new areas.
The health authorities of the state state that at this time they are unaware of any public places to which the resident of Chippewa County may have exposed other people, and contact tracing is being carried out in order to identify those who have had close contact and to provide advice on what to do next.
What Is the Size of This Outbreak?
The state has now seen over 170 cases of measles this year, and the data from the state shows that almost all of them—more than 99%—are in individuals who were not vaccinated against measles.
The situation is the same all over the United States. The CDC has recorded over 3,400 cases of measles in 46 states and Washington, D.C. in 2026. Approximately 95% of these cases are associated with outbreaks. Should this trend persist, it could result in the highest annual total for the country in over 30 years.
What Measles Looks Like
Measles is very contagious and spreads through the air when an infected person coughs, sneezes or even merely breathes. The symptoms typically begin 7 to 21 days after exposure and early signs usually include:
- High fever (sometimes over 104°F)
- Cough, runny nose and red, watery eyes
- Feeling very tired or run down
How the Measles Rash Develops
A few days later the rash, which is red and blotchy, usually starts at the hairline and the face before spreading down the body, and some people also notice small white spots inside their mouth a short time before the rash appears.
If You Think You Were Exposed
If you develop symptoms or believe you were around someone with measles, health officials recommend:
Stay Home and Avoid Contact With Others
Remaining at home and maintaining a distance from other people, in particular from babies, pregnant people, and those who have a weakened immune system, is important.
Call Your Doctor Before Visiting
Go in to your doctor’s office or clinic only after you have phoned them, since measles is easily transmissible and the clinic needs time to arrange the necessary precautions.
Check Your Vaccination Records
You should check your vaccination records since two doses of the MMR vaccine are approximately 97% effective at preventing measles while one dose is about 93% effective; if you’re uncertain, your healthcare provider can assist you in working out your current status and talk through the next steps.
Why This Matters
Measles is not merely a rash and a fever; it can cause serious complications such as pneumonia, dehydration, ear infections and, in rare cases, brain inflammation. This year, hospitalizations have been frequent in outbreaks throughout the country, impacting both young children and adults.
The Importance of Vaccination
The most effective means of protection is through vaccination; experts state that in order to prevent measles spreading easily, communities need about 95% of their population to be fully vaccinated. In recent years, MMR vaccination rates among kindergartners have fallen below that figure in many areas, and this is one of the reasons why outbreaks are occurring.
What Wisconsin Residents Should Do Now
With cases popping up in different parts of the state, officials are encouraging everyone to:
- Learn the symptoms and keep an eye out after any possible exposure
- Make sure you and your family are up to date on MMR vaccines
- Follow advice from local health departments if you’re told you were a close contact
Updates From the Wisconsin Department of Health Services
The Wisconsin Department of Health Services will continue to update the figures and exposure information on its measles page as the situation evolves.
