10/16/2026
As of 10/16/26, there have been 288 total cases in Wisconsin in 2026.
The interactive measles data dashboard is updated on Tuesdays and Fridays.
Southwest Wisconsin measles outbreak
Grant County Health Department, Lafayette County Health Department, Iowa County Health Department, Vernon County Health Department, and DHS are coordinating across jurisdictions to support case investigation and response. The ongoing investigation indicates that measles is spreading locally.
Southwest Wisconsin (Grant, Iowa Lafayette and Vernon Counties) Case Count
258 confirmed and 6 probable cases
Grant: 76 confirmed
Lafayette: 102 confirmed or probable
Iowa: 74 confirmed
Vernon: 12 confirmed
Northern Wisconsin Measles Case Count
Marathon County
6 confirmed cases
These cases are related to out-of-state travel and are not related to the cases in SW WI.
Chippewa County
11 confirmed cases
These cases are related to out-of-state travel and are not related to the cases in SW WI.
Rock County Measles Cases
As of October 16, 2026 there have been 5 probable cases of measles reported in Rock County. These cases are linked to one another but are not connected to the ongoing outbreak in Southwest Wisconsin. At this time, the source of the infection remains unknown. The cases are considered probable based on symptoms but have not yet been confirmed by laboratory testing.
Rock County Health Department and DHS are working to identify and notify people who may have been exposed to the measles virus.
To protect individual privacy, no additional personal identifying or health information will be released by DHS.
Measles case count dashboard at
https://www.dhs.wisconsin.gov/immunization/measles.htm
More at https://www.dhs.wisconsin.gov/outbreaks/index.htm