I found the Ciccozzi paper. If I'm reading it correctly, one of the three clusters, and the most widespread, from other reading, forms a cluster with Southern Germany, which was detected there earlier.
Two of the three clusters are in the Wuhan cluster. One can be traced to the tourist couple from Wuhan who were quarantined in Rome after they became ill. My understanding from prior analyses done by Americans is that there was no discernible spread from there. Another cluster is also Wuhan based, but the doctor doesn't describe the area or severity of spread.
That's not helpful, if only because of all the speculation that somehow industrial and agricultural products from China are to blame. Even worst case estimates are that the virus only lives for three days on plastic and metal, but people are still speculating about this. We don't need this at a time when masks and ventilators are coming to Italy from China.
We also don't want crazies to start looking at the Chinese residents in Prato and similar areas if it has nothing to do with them.
I think the odds that two people from Jinjiang, where that particular set of mutations originated, both positive in a place where at that time it was barely present, then traveled to both Italy and Bergamo to infect others, are pretty slim.
Italy closed access from China right away, and quarantined those Wuhan Chinese arrivals, but nobody was testing people crossing the Alps to come skiing.
I'm not casting blame here. Contact tracing is never perfect, and quarantines often spring leaks. We just shouldn't be misinforming the public by refusing to be transparent.
https://onlinelibrary.wiley.com/doi/pdf/10.1002/jmv.25773
Some spread outside China was inevitable, but had China not lied to the world about it, we'd all be in better shape.
That's why it sets my teeth on edge the way China is posturing about sending aid to Italy, and getting the Communist stooges in Cuba to send doctors as well. I'm sure most of the latter are well meaning, and the Cuban-American doctors I know are brilliant, but what medical schools did the descendants of those who stayed behind attend?