For reasons not fully understood, it’s thought that these people were already immune to the Covid virus, and they remain so even as it mutates.
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Probably due to the human body’s sophisticated innate immune response. A system we have a very incomplete understanding of.
If only there was a natural immunity to becoming irrationally afraid or to becoming irretrievably ignorant we’d have a chance of getting out of this mess. We gain immunity through exposure to germs and viruses which stimulates the immune system to produce antibodies … not by trying to hide from them. Perhaps something similar could be achieved with exposure to unafraid, rational people … but that would involve stimulating the logical mind which far too many people have displaced with raw emotion.