I was one of those "I got something weird in late Feb 2020, maybe it was an early Covid case!" people, so I got an antibody test in April or May of last year, when they became easy to get. Nothing - so yeah, must've just been a weird cold of some sort. It was strange since it didn't have the runny nose or head congestion, but was predominantly breathing/cough related.

There was definitely something going around late 2019/early 2020. I had it, and so did many people I know.

But it's very unlikely it was Covid, because Covid is much more infectious and more deadly than both colds and flu.

People weren't masking or taking any precautions then, so Covid would have spread very quickly indeed. And that would have created an obvious medical emergency, with hospitals at full capacity and a clear peak in unexpected deaths.

Relatively minor symptoms, no huge increase in hospitalisations, and no huge peak in deaths all suggest Covid wasn't the culprit.

It's kinda too late now though, since most of those people are vaccinated now so they'll have antibodies already, right?

My understanding is that the vaccine will create antibodies for the spike protein (since that's been the thing the vaccines reproduce to train the immune system on) but not the nucleocapsid protein. https://www.technologynetworks.com/diagnostics/blog/covid-19...