Overview
- State health officials said Thursday that the outbreak in Iowa and Lafayette counties has grown to 15 confirmed cases and six probable cases after lab testing and clinical diagnoses.
- Investigators report active local transmission because many infected people had not traveled out of state and nearly all recent Wisconsin cases have been in unvaccinated people, with no hospitalizations reported so far.
- The Wisconsin Department of Health Services is leading case interviews and contact tracing with help from the CDC and county health departments, and officials have not yet identified specific public exposure sites.
- Kentucky health authorities confirmed an unvaccinated measles case in Christian County that officials say was likely exposed by an out-of-state visitor, and they are investigating additional suspected cases there.
- Public-health officials warn the outbreak reflects low MMR coverage in parts of the region — Lafayette County had about 55% two-dose coverage for 6-year-olds in 2025 — and they urge people to check vaccination records as schools reopen and the nation records roughly 2,500 measles cases this year.