People who were at Klumpen preschool in Umeå on Thursday and Friday last week may have been exposed, according to Region Västerbotten's infectious disease control.
In August, measles spread across the country after an outbreak at the Urkult festival. Those who fell ill - a total of 36 people according to the latest update from the Public Health Agency - were mainly school-age children and young adults, most of whom were unvaccinated.
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