This has been reported from a number of places as a possibility. Coronaviruses are a member of the virus group that give us common cold and one theory is that

This has been reported from a number of places as a possibility. Coronaviruses are a member of the virus group that give us common cold and one theory is that the common cold has cross reactivity with Covid immunologically. So there may be a huge population with built in immunity. Sweden has had tiny amounts of deaths for weeks, New Zealand, I think Italy and some other countries as well. It's not just the U.S. it's other countries.