“How did they get this information? Aren’t students’ medical records private?”
Probably the local health department. Certain infectious diseases are mandated to be reported.
When my son got salmonella, I got a phone call from the Dept of Health asking about whether or not others in our family got it, where he went to school, etc.
Not under the " Common CORE " crap program ,
"All your information are belong to us "- the BORG
There is no more privacy under FEDGovt. owned information : your politics ,your familys politics ,cooperation to indoctrination, willingness to go along to get along, etc.