"Effective immediately, we will not require a physician’s note for absences exceeding three days." This is Prince George's County, Not Montgomery County.

...Prince George’s County Public Schools (PGCPS) continues to adhere to guidance and direction from county and state health departments for the well-being of all students and staff. We encourage parents and guardians to keep their children home from school if they are sick. Effective immediately, we will not require a physician’s note for absences exceeding three days. A parent’s note with contact information will be required for the absence to be considered lawful. 

In addition, starting this week, we will designate times during the school day for younger children to wash their hands and remind older students to do the same.

Please note that after additional consultation with the Maryland State Department of Education (MSDE), any missed days of school or work due to coronavirus-related closures will be treated the same as inclement weather/emergency closings. Any classroom or work assignments will be made up when the building reopens...

https://www.pgcps.org/coronavirus/