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The six k dating is almost rediculous, since TB has been endemic in north American bovids, bison, and big horn sheep, but oddly not prohorn antelopes , for at least 25k years.
Signs of tb have been found in fossils from all over Na.
I pondered the question , just on the anthropological aspects, the nitty gritty of genetics is to much like work so I leave that for others.
So what I noticed is ,like you illustrated, the piniped strain was down stream of both Peruvian human and Na bovid strains
The question I asked myself is how can a disease that is found in such disparate animals as seal and big horn sheep, who’s habitats never coincide, be related?
The one thing they have in common is human hunters. I know that in many hunter gatherer societies, great reverence is placed upon the prey. If the hunter is lucky enough to catch the last breaths of the prey they can be used to catch or transport the spirit of the prey. I belive that is how it was spread from humans to bovids and pinnepeds or visa versa.
Since TB is endemic in the new world by 25 k years ago it supports a very early human entry to the new world.