This time the article is in the New York Times.
Although it isn’t the only uncontaminated herd of bison, this is another reason with conserving the Yellowstone Park bison is so important, and I think a reason to let them set up and live adjacent to, but outside Yellowstone Park on public land, which is cattle free (so no danger of passing brucellosis to cattle, assuming we even buy into that story).
Out West, With the Buffalo, Roam Some Strands of Undesirable DNA. By Jim Robbins. New York Times.