It's no danger to humans. It's one of those bugs that can opportunistically infect humans when their immune system is severely limited (i. e. end-stage untreat

It's no danger to humans. It's one of those bugs that can opportunistically infect humans when their immune system is severely limited (i. e. end-stage untreated AIDS, unfortunate incident at a nuclear reactor). But that's a situation where almost anything will kill you. (I once had a professor who likened it to a run-down house with young trees sprouting from the roof, adding that he'd be somewhat, but not extremely, surprised to find a immunocompromised patient with moss growing somewhere)