The situation mirror’s the state’s worst COVID spike on record, which happened last November.
Announcement comes as children account for the largest number of new COVID-19 cases in the state.
Lawsuits against Wisconsin schools that don’t require masks could be filed soon following the death of at least two students who had tested positive for the coronavirus.
The vote comes after the school board voted twice last month against requiring masks amid a nationwide surge of the Delta COVID-19 variant.
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