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What is really surprising is that there have been no documented outbreaks to date. Clearly until very recently thousands of people travelled from Wusan to multiple points in the US. It is very likely some of these people were symptomatic or asymptomatic carriers of COVID-19. Yet no outbreaks to date. Why? Is genetic susceptibility the key factor? Are the cases in Iran and Italy given the relative non availability of reliable specific diagnostic testing really COVID-19 infections? Still do not have enough information to determine if a true pandemic will occur.

Turn that around. The number of Chinese travelers from Hubei to the US was only a very tiny fraction of Hubei's population. Unless the Chinese numbers were literally off by 2 orders of magnitude or more, as of the time that travel from Hubei was chopped, the % of those in Hubei Province who were infected was also a very tiny fraction of that population. This gets us into literally only a handful or less people coming into the US from Hubei as potentially infectious carriers -- and I'll bet a few of the cases caught here were related to Hubei in some way.