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Measles in Wisconsin: New Case Confirmed in Marathon Co., 164 Total Cases as of Sept. 15
On Tuesday, the Wisconsin Department of Health Services and the Marathon County Health Department confirmed a measles case in a Marathon County resident who contracted the virus during out-of-state travel and is currently isolating.
Health officials clarified the new case is unrelated to the ongoing measles outbreak in southwestern Wisconsin, where clusters in Grant, Iowa, and Lafayette counties have grown to over 155 confirmed and probable cases.
Statewide, Wisconsin has recorded 164 total measles cases in 2026, with symptoms including high fever and "a red rash with raised bumps" that can lead to pneumonia or brain damage.
DHS advises residents to verify their vaccination status, as the MMR vaccine is 97% effective, with children recommended to receive two doses starting at 12 to 15 months.
Anyone suspecting measles exposure should contact a clinic before arriving to prevent further spread, as symptoms typically appear 10 to 21 days after exposure and Marathon County public health staff continue monitoring the situation.