[JayGalt]

Exactly. If you were not staying home you interacted with many other people. How can you know that it was a child in your class that passed the virus to you?
Teachers over 50 or with chronic illnesses should be tele-teaching not closing schools.
Taken to the logical conclusion: people that are immunocompromised are isolated. The world doesn’t shut down and suitup to protect the immunocompromised person unless they are caretakers.

[Harmless Teddy Bear]

Exactly. If you were not staying home you interacted with many other people. How can you know that it was a child in your class that passed the virus to you?

Heck even if you stay at home you are interacting with other people. Even if it is just picking up the box of food they left outside your door.