Looking at the world wide incidence of covid-19, I see the influence of networks--it's as if the virus is a tracking molecule, like taking barium before a CT scan.
You start with Wuhan, which is networked both to Europe and the US. (I'm guessing it might have particular ties to Italy?) The US is more closely networked with Europe than China, so a majority of our virus imports seem to have come from there. Meanwhile nations such as Russia, India, and Brazil are less closely connected to China and, perhaps more significantly, are less networked internally than countries such as UK and US.
Within the US the NYTimes map shows a correlation, in my mind at least, between the timing and volume of cases and the networking of the state and county. Currently the Northeast states are on the down slope, while the Southeast states are on the upswing.
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