Another aspect I haven't seen any coverage on is that the hospitals are screening based on symptoms and travel history. That works (or it was supposed to) with those bringing it in. If we now have an outbreak, those with no known contact with patient zero will not have a travel history to reference.
You can't isolate every person who gets a fever, and differentiating early symptoms from other more benign maladies becomes much more difficult.
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"You can't always get what you want" -Rolling Stones
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