A person with confirmed measles was contagious while sitting in the emergency department at Marshfield Medical Center–Weston for two hours Thursday afternoon, and now health officials are scrambling to find everyone else who may have been exposed. The potentially infectious visit happened between 1:30 and 3:30 p.m. at the hospital's 3400 Ministry Parkway location, and anyone who passed through that ER during that window could be at risk, even if they never interacted directly with the infected patient.
The person was contagious during that visit, according to Wausau Pilot & Review, which reported on the confirmed case this week. The Wisconsin Department of Health Services and the Marathon County Health Department are now working together to identify and notify anyone who may have been in the department during that two-hour stretch, as reported by WSAW. The case was also detailed by WAOW in a report dated Friday, Nov. 6.
Free Vaccine Clinic Set for Sunday
To get ahead of any secondary spread, Marathon County is holding a free MMR vaccination clinic from 10 a.m. to noon on Sunday, Nov. 8, for people who were in the Weston emergency department during the exposure window and are not immune. Vaccines will be provided at no cost, interpretation services will be available, and insurance information is not needed, the station's report notes. Attendees are asked to park in Lot D or E and enter through Door 28.
Getting a dose quickly can matter. For people without immunity, receiving the MMR vaccine within 72 hours of exposure may prevent measles entirely or lead to a milder case, per the same account. Two doses of the MMR vaccine are about 97% effective and provide long-lasting protection, according to the CDC, the outlet adds.
Watching for Symptoms Over the Coming Weeks
Health officials said symptoms among exposed people who lack immunity would likely appear between Nov. 11 and Nov. 25, while those with weakened immune systems may develop symptoms sooner. Anyone who does develop symptoms after a possible exposure should call ahead before seeking medical care and tell their provider they may have been exposed to measles, according to a Wisconsin Department of Health Services release distributed via EIN Presswire.
A Growing Statewide Count, With Conflicting Local Numbers
The Weston exposure comes amid a broader statewide surge. As of Nov. 3, Wisconsin had recorded 431 measles cases across 13 counties this year, with nine people hospitalized for severe symptoms, Wausau Pilot & Review reported. That same report said DHS listed six confirmed cases in Marathon County as of Nov. 3, while a separate Marathon County Health Department announcement said two additional cases had brought the county's total to five cases, without specifying when that count was tallied. The two figures have not been reconciled in available reporting.
Vaccination rates offer some context for why outbreaks are spreading. DHS reported that 85.1% of Wisconsin kindergartners had received both MMR doses during the 2025–26 school year, while the share claiming non-medical exemptions rose to 7.3%, according to Wausau Pilot & Review.
Marathon County Cases Separate From Deadly Southwest Wisconsin Outbreak
The Marathon County cases are not connected to a larger, deadlier outbreak unfolding in southwestern Wisconsin, according to FOX 9, which reported that outbreak has produced 362 confirmed and six probable cases across Grant, Iowa, Lafayette and Vernon counties. That outbreak was also linked to an infant death reported Thursday, which FOX 9 said represents the state's first reported measles fatality since 1990. Statewide, more than 42,000 MMR doses have been administered since Aug. 1, the station reported, as health departments push to blunt further spread.
