> Basically the theory is that children often get the 4x regular coronavirus strains and this provides a bit of protection against the new coronavirus strain.

> Basically the theory is that children often get the 4x regular coronavirus strains and this provides a bit of protection against the new coronavirus strain. If that is true, that would seem to imply that one could improve one's resistance of COVID-19 by deliberately infecting themself with one or more non-COVID-19 coronaviruses. (Not that I suggest anyone try this.)