“We don’t know why some people (even young patients without pre-conditions) wind up with severe respiratory failure and/or multi-organ system failure, and others (even older patients with pre-existing conditions) have mild symptoms - or no symptoms at all.”
How about the simple explanation that some peoples immune system is just better than others?
“How about the simple explanation that some peoples immune system is just better than others?”
Maybe. On the other hand, the ‘cytokine storm’ that is implicated as a contributor to the severe respiratory collapse and multi-organ system failure in the most ill patients, is a component of the immune response.
For all of our hubris as human beings, there’s just so much we don’t know.