Long time lurker here. January 2020, was in a training class in Virginia and a respiratory virus went through the class like a wildfire. Flu tests were taken but they were all negative. I had gone through H1N1 before, back in 2009, this was a milder case but showed symptoms of shortness of breath, brain fog, fever, chills, some diarrhea, and exhaustion. Three months later, I had an antibody test done that showed little Igg activity for Covid but a good amount of Igm activity. Did I go through it?