“With the highly contagious Delta variant spreading and most kids not immune, it’s a perfect recipe for transmission in schools,” said Thomas Dobbs, Mississippi’s state health officer.

Ash Fork, a small district in Arizona, canceled classes just days after school opened because several teachers tested positive or were caring for someone who did.

A Mississippi school district on Friday told parents that two high schools will go remote “due to the high transmission rate of COVID-19.” On Tuesday, the district announced its middle school would as well.

And on Friday, the Austin Independent School District in Texas, where cases are skyrocketing, announced a virtual option for children under 12 years old because they are ineligible for the vaccine.