[malandrew]

This would also explain why many people are asymptomatic. They are still getting exposed but with a much lower viral load. Maybe the best "vaccine" here is just the lowest possible microdose of the coronavirus. We really should be looking at all the asymptomatic or low symptoms folks and figuring out what they have in common with one another. I would bet you it's just very low exposure, which gives the body more time to develop antibodies and mount a defense instead of the immune system being overwhelmed before it can adequately develop antibodies.