So any city that is known to have come from the Biogen outbreak...watch carefully. Such as Indiana
Biogen Super Spreader probably had the Italian version of this.
There are two main types being talked about S and L. L is for lethal, I guess S is for serious. Certainly the large number of Chinese returning to their jobs in Italy could have been carrying both kinds, but the L form definitely got the upper hand. I think I saw that the west coast mostly got the S form.