I did read the full post. It stated very clearly that these bacteria were found in the atmosphere. When I added the word upper, it was to differentiate that portion of the atmosphere from the rest of it. Much as I used the word precipitation, rather than just snow, intentionally.
In much the same way that ground level ozone and ozone in the upper atmosphere have differing effects, so too would the presence of this bacteria in the lower atmosphere and the upper be different. It's a lot colder in the upper atmosphere, even over places where it does not snow but might rain. Only occasionally is it -6C down at ground level.
but rather than its usefulness for humans, I am admiring the ability of this and many other bacteria to travel this way, and return to the ground that way.