I think this bug is unique in many ways and it may take many years to fully figure it out. Until then we are really grasping at straws here.

Many who get this thing and are asymptomatic might very well find out years later they have serious damage in various organs.

We already know folks with health issues are at greater risk. That makes sense because their systems are weakened already.

It seems this bug has the ability to detect where it's chances for success are greatest. That's what they have to figure out.