Mesa County’s late-summer measles outbreak started with three children who brought the virus back from an out-of-state trip, ultimately passing it on to eight other people.

The Colorado Department of Public Health and Environment previously identified seven people who contracted measles within the county, raising concerns that the virus was spreading under the radar .

On Wednesday, the agency announced four additional cases from August, including the three who traveled and one person they infected directly. Those four previously unidentified people then spread the virus to the seven known cases.

All four of the new cases were unvaccinated children between 5 and 17, according to the health department. It didn’t release any other information, such as which state the children traveled to

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