re: #11 retired cynic

Could there be something older people were infected with years ago that was related enough to this that it triggers a major immune response? That younger people haven’t, in most cases, been exposed to? I have no idea what I am talking about.

Until the early 70’s, smallpox was part of routine childhood vaccines; then they stopped doing that. People born before 1968 probably had that, and people born after that probably don’t.