>So mutating for airborne transmission among humans is just not on the evolutionary agenda here. Airborne transmission isn't an evolutionary agenda item. It's

>So mutating for airborne transmission among humans is just not on the evolutionary agenda here. Airborne transmission isn't an evolutionary agenda item. It's an evolutionary event with a non-zero probability of occurring, so far as we know. Evolution is a great mechanism based in part on the aphorism, "If it can happen, it will".