Washtenaw County Measles Outbreak: Exposure Sites and Public Health Guidance
Health officials in Washtenaw County, Michigan, have confirmed a measles outbreak, marking a serious public health concern for the region. The Michigan Department of Health and Human Services (MDHHS) and the Washtenaw County Health Department officially designated the situation as an outbreak after identifying three or more related cases. As of the latest reports, at least seven cases have been confirmed.
Measles is an extremely contagious viral infection that spreads through the air. Because it can remain active and infectious in the air for up to two hours, the risk of transmission is high for anyone who is unvaccinated or not immune.
Timeline of the Outbreak
The outbreak began with a confirmed case on March 11, 2026, involving an unvaccinated adult who likely contracted the virus while visiting Florida. This was the first case reported in Michigan for the year. Following this, the MDHHS confirmed that three linked cases had been reported since March 12.
By late March, a seventh case was confirmed. This case involved an unvaccinated child who had been in close contact with the first reported case. The rapid spread underscores the vulnerability of unvaccinated populations to this airborne pathogen.
Confirmed Public Exposure Locations
Public health officials have identified several locations where individuals may have been exposed to the virus. If you visited these sites during the specified times, you should monitor your health closely.
- March 17: Washtenaw Community College and the Kroger located on Whittaker Road.
- March 21 (1:45 p.m. To 7:28 p.m.): Trinity Health Ann Arbor. Exposure is specific to the emergency room treatment areas; the waiting area is not included in this exposure alert.
What to Do If You Were Exposed
If you are unvaccinated or not immune and believe you were exposed to measles, immediate action is necessary to protect yourself and the community.
Monitor for Symptoms
Anyone exposed to the virus should monitor themselves for symptoms for a full 21 days. Health officials advise those who are unvaccinated to stay away from others for the duration of this 21-day window to prevent further community spread.
Seeking Medical Care
If you develop symptoms or suspect you have been exposed, call your healthcare provider before arriving at the clinic or hospital. This allows medical facilities to take necessary precautions to protect other patients and staff from potential exposure.
Preventative Medication
For high-risk individuals exposed to the March 17 cases, the window to seek preventative medication ended on Friday, March 27. Those who missed this window should continue to follow monitoring guidelines.
Key Takeaways for the Public
- Contagion Level: Measles is highly contagious and spreads via the air.
- Airborne Risk: The virus can survive in the air for up to two hours after an infected person has left the area.
- Prevention: Vaccination is the most effective way to prevent illness and transmission.
- Action Step: Call ahead to medical providers if you suspect exposure.
Frequently Asked Questions
How is measles transmitted?
Measles spreads easily through the air when an infected person coughs or sneezes. It is so contagious that if one unvaccinated person is exposed, roughly 90% of other unvaccinated people around them will also become infected.
Who is most at risk?
Unvaccinated individuals, particularly children and adults who have not received the MMR (measles, mumps, and rubella) vaccine, are at the highest risk of contracting and spreading the virus.
Where can I find more official information?
For the most current updates and official guidance, residents should visit the Washtenaw County Official Website or the Michigan Department of Health and Human Services.
As this outbreak continues, staying informed and ensuring vaccination status remains the best defense against the spread of measles in Washtenaw County.