It can teach don’t let unfettered travel occur from China where there’s an epidemic to the fashion industry’s center because you want cheap Chinese manufacturing and labor in your “made in “Italy” factories.
IOW, 20,000 known Chinese people with legal Chinese citizenship, in Milan. They are centered in the textile/clothing/fashion industry. There is a LOT of travel and commerce back and forth between Milan and China, as well as a lot of circulation amongst Chinese communities in Italy ----large numbers in Rome, and Prato (in Tuscany) as well as somewhat smaller numbers in Turin and Florence.
How this related to the Coronavius epidemic is yet to be explored.