[blam]

"How does this data correlate with AmerIndian populations, who certainly did not see exposure in the 14th Century."

Don't know.

Weren't there numerous outbreaks of something like the Black Death in Europe?

[Freedom Dignity n Honor]

Numerous outbreaks of plague.

I think the Black Death was when the plague went from bubonic to pneumonic plague. It's extremely contagious, spread by coughing, sneezing, etc., infects the lungs, people could be dead within hours of infection and they turned black either due to lack of oxygen and/or blood seeping out of their bodies but being contained by the skin.