Wisconsin Confirms Nine Measles Cases Linked to Out-of-State Travel

The Wisconsin Department of Health Services confirmed nine measles cases in Oconto County in 2025, marking the state's first cases of the year. One case was confirmed through laboratory testing, with eight additional cases identified based on symptoms and exposure to a common out-of-state source. Health officials have not identified any public exposure points, and the risk to the community remains low. Measles is highly contagious, spreading through the air and potentially infecting up to 90% of unvaccinated people in close proximity. Symptoms typically appear 10 to 21 days after exposure and include fever, cough, runny nose, watery eyes, and a distinctive rash. Health experts emphasize the importance of the MMR vaccine, which is 97% effective at preventing measles, and advise anyone with symptoms to call their healthcare provider before visiting a clinic to avoid spreading the virus.