Here’s my question, inspired by the fact that so many seem to have no-to mild symptoms when infected:

Is it possible that in the last few years, we already lived through a “pandemic”, without knowing it, of a relatively mild flu/cold-like coronavirus that imspired an immune response that left a large portion of the population with total to partial immunity to COVID-19?

Anyone?

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Update:

One third of participants in Massachusetts study tested positive for coronavirus

So….is that because they developed those antibodies in response to an asymptomatic infection of COVID-19……or has there been another bug running around for awhile that causes the same antibodies to be created……

Inquiring minds want to know. :-)