While I have said my peace on my behavior, the data quantified demonstrate that we know Italy does not have a lot of social distancing, I agree with you was to the relative amount of Chinese in the Lombardi region of Italy, Genetic Lineages I assume you mean to two subtypes. I have read on that, but this is the largest collection of data that can be subdivided into a significantly significant N.
Our population density is significantly lower than Italy’s. Our cities are much more spread out.
On another site, a lay person has been posting about studying the spread in different locales, and inferring from that data at least two different subtypes with different R0 values.
Trevor Bedford has done a lot of work (e.g. Tweeting today that all the Washington nursing home cases can be ascribed to a single “patient 0” who was a 35-year old man who had...wait for it...been to Wuhan.
It’s not just Chinese in Lombardy. It’s that they are Chinese from Wuhan.