How and why did they test that many people in one day...
It could be as simple as a kid getting tested BEFORE school starts (due to an exposure risk or signs of illness) and the results being forwarded by a parent to the school after school starts.
Then, “out of an abundance of caution”, the school and district “orders” the teacher of that class and all her students into “home quarantine”.
The question before society: Is that the right way to handle a positive student? What about a positive staff member?
“How and why did they test that many people in one day...”
Example of distorted reporting.
Never does it say a thousand tested positive or were even tested.
Quarantine refers to people who may (or may not) have been exposed.
There were some cases so everyone potentially exposed is asked to stay home for a couple weeks.