By CBS3 Staff

UPPER MERION, Pa. (CBS) — Several Montgomery County schools are closing for sanitizing out of an abundance of caution due to various connections to COVID-19 coronavirus cases. All Norristown and Upper Merion District schools will be closed on Tuesday.

“Viking Nation, as a precautionary measure schools will be closed on Tuesday, March 10 in order to allow us to perform ‘enhanced cleaning’ within our buildings. All after school and evening activities will also be cancelled on Tuesday. I appreciate your patience!” Upper Merion Superintendent Dr. John Toleno tweeted.

What You Need To Know: Latest Coronavirus Information From Pennsylvania, New Jersey And Delaware Health Departments

All Lower Merion School District schools will be closed Tuesday.

READ MORE: Two Delaware County School Districts Opening Vaccination Clinics For Students Ages 16 Or Older

All Cheltenham School District schools will be closed for the rest of the week.

Simmons Elementary School in the Hatboro-Horsham School District will be closed Tuesday.

Neshaminy High School in Bucks County will be closed Tuesday after a student came in contact with a Children’s Hospital of Philadelphia doctor in King of Prussia who has coronavirus.

Buckingham Friends School in Bucks County will also be closed Tuesday.

Henderson High School in the West Chester Area School District will be closed Tuesday after a student was potentially exposed to coronavirus at the King of Prussia facility.

In Montgomery County, health officials say there are now seven presumptive positive cases of the coronavirus. That included the doctor who’s in critical condition at the University of Pennsylvania Hospital.

MORE NEWS: Trenton Officials Making Sure People With Mobility Issues Receive COVID-19 Vaccine

In New Jersey, all Trenton schools will be closed Thursday and Friday while the schools are sanitized and staff prepares instructional plans in the event that schools are closed due to the coronavirus.