It may well be super wide spread already, let us assume it is for a moment. What does this tell us about how deadly it is on average? Answer: Not nearly as deadly as we thought.
On average depends who you are.
The age curve seems to be very steep. I think I’ve heard through the grapevine of three nursing homes that had about a 50% fatality rate among the patients.
Grade school—not that big a deal. Unless you go home and kill grandma.