CHATTANOOGA (AP) — Two schools in Chattanooga, Tennessee are closed after someone tested positive at each school for COVID-19, the illness caused by the new coronavirus, officials said.

News outlets report that the Hamilton School District said the Chattanooga School for the Arts & Sciences and Loftis Middle School will be closed for cleaning Thursday and Friday. School officials did not say if it was students, teachers or staff who tested positive for the virus at each school.

The district resumed in-person classes this week under a hybrid schedule for the first time since March, when the virus outbreak struck.

The Tennessean reports that nearly 65 school districts have started the school year as of Aug. 7, with the majority of them starting in-person classes. At least 39 confirmed COVID-19 cases connected to schools have already been reported, according to the newspaper.

Williamson County Schools, Coffee County Schools and Blount County Schools, have already closed schools or altered schedules.

More than 80 students and staff were quarantined in Putnam County after a student at Cookeville High School tested positive for COVID-19.