TOPEKA, Kan. (AP) — Public health officials in one of Kansas' most populous counties are urging nearly every resident to wear a mask in schools and other indoor public spaces because of the faster-spreading COVID-19 delta variant.

The Lawrence-Douglas County Public Health department recommends that anyone aged 2 or older wear masks even though the county has among the highest vaccination rates and the lowest total number of COVID-19 cases per capita among the state's 105 counties. The department updated its guidance Tuesday.

The county's new guidance came the same day the U.S. Centers for Dise...