I totally understand the urgency in trying to find a vaccine, treatments, and looking after those that are ill right now. One of the big questions I have is why so many can be carriers, never have symptoms, and never get sick. What do those people possess physiologically that others do not?
Well, maybe it's like HSV-1 (oral herpes). The CDC estimates that close to 50% of the population carries it (even higher for our age group) , yet only a tiny fraction of those ever have symptoms (cold sores). And, like Covid, you can be asymptomatic and spread it.