I gleaned this from the comments section from the OP on Reddit:
They used the word "FRI-positive", not "TRI-positive". FRI is not some secret code word for coronavirus but jargon that stands for "febrile respiratory illness", which is for the EMS people to take appropriate precautions.
[–] derram ago
https://www.invidio.us/watch?v=vETvMdJST78 :
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