There have been tests for influenza for quite a while.
Reason I’m really curious is that early on in this cluster I had an antibody test that came back positive for a current WuFu infection.
I quarantined for another week, had a PCR that came back negative.
I was asymptomatic when I was tested both times, but I had been ill a few weeks previously.
Really wonder what the heck I had.
You had covid