I wonder if some of these sailors are young enough to get the Kawasaki-like Disease some kids are having a few weeks after recovery. We are also seeing fairly young people having mild cases or even asymptomatic cases and then dropping dead a few weeks later from a stroke or throwing an embolism into their lungs.

This (and Kawasaki) are probably all the same thing: Inflammation of the endothelium following an immune system reaction to a virus. Doctors have hypothesized that about Kawasaki for a long time. In fact, the virus could have been one of the similar corona viruses that have circulated as common colds for years. Even if the virus doesn't do that much damage, it's the immune response that kills you.

Maybe docs need to start giving recovered people just a little prednisolone for a couple of weeks to avoid this stuff.