As of October 30, 2026, the Wisconsin Department of Health Services (DHS) has confirmed 392 cases of measles in Wisconsin so far in 2026.
Grant, Iowa, Lafayette, and Vernon Counties (Southwest Wisconsin) measles outbreak
As of October 30, 2026, there have been 336 confirmed and 6 probable cases of measles in the outbreak in Grant, Iowa, Lafayette, and Vernon Counties.
The ongoing investigation indicates that measles is spreading locally. DHS, in coordination with Grant, Iowa, Lafayette, and Vernon County Health Departments, are working to identify and notify people who may have been exposed to the measles virus.
Chippewa County measles outbreak
As of October 30, 2026, there have been 33 confirmed cases of measles reported in Chippewa County.
The ongoing investigation indicates that measles is spreading locally. DHS, Chippewa County Health Department, are working to identify and notify people who may have been exposed to the measles virus.
Rock County measles cases
As of October 30, 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.
Richland County measles case
As of October 30, 2026 there has been 1 confirmed case of measles reported in Richland County. The case is linked to previously reported cases connected to the ongoing outbreak in southwest Wisconsin.
Richland County Health Department and DHS are working to identify and notify people who may have been exposed to the measles virus.
Marathon County measles cases
As of October 30, 2026, there have been 6 confirmed cases of measles reported in Marathon County.
These cases are related to out of state travel and are not related to the cases in Southwest Wisconsin. Marathon County Health Department and DHS are working to identify and notify people who may have been exposed to the measles virus.
Jackson County measles cases
As of October 30, 2026, there have been 2 confirmed case of measles reported in Jackson County.
These cases are related to out of state travel and are not related to other cases in Wisconsin. Jackson County Health Department and DHS are working to identify and notify people who may have been exposed to the measles virus.
Marquette County measles case
As of October 30, 2026, there has been 1 confirmed case of measles reported in Marquette County.
This cases is related to out of state travel and is not related to other cases in Wisconsin. Marquette County Health Department and DHS are working to identify and notify people who may have been exposed to the measles virus.
What is a confirmed case?
Confirmed measles cases are cases that have symptoms consistent with measles and have been laboratory confirmed or have a direct link to a confirmed case by location and time. Probable cases have symptoms consistent with measles but have not been laboratory confirmed or directly linked to a confirmed case...
Source:
https://www.dhs.wisconsin.gov/outbreaks/index.htm