Lice is still notified depending on where you are at but it was something that always triggered a notice from the school when I was growing up. I mentioned lice not so you would latch on to that as an example regarding some life threatening thing because that isn't why schools send notices about things but its infectious aspect (I clearly mentioned measles too, agreed about the flu, also the PP's comment towards norovirus and whooping cough so try not to fixate on lice). I don't think that and other things became that way overnight for parents to be notified by schools, nor would I expect uniformity across the nation on COVID at this point in time.
I would hope they are being very cautious but you're going to get varying opinions on what that means. For some parents it's that they need to know the name of the kid that has it so they can get their kid away from that kid. For others it's just knowing that the school had a positive case.
What I was trying to say is what a parent wants and what the county's health department and any applicable laws or merely just concerns could be playing a role in this or that. That was the part I was saying is so new. No one really knows the best way to handle this on notification--is it to compel all businesses to put a notice on their doors that they have a positive case or that there was an exposure, is it to compel all schools to publicly announce and send notices to all parents whenever there is a positive case or potential exposure versus just the parents/students considered close contacts, is it for the health department to announce all names and locations of outbreaks (which depends on what definition you are using), etc? And what about privacy concerns, what information should be given to the public and which information should be protected information. And that's not even considering any sort of uniformity in such protocols on this ever-changing, quickly evolving situation where what happens this week may be completely different than next week.