"Fortunately, only mild departures from full open borders are…

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https://www.econlib.org/archives/2014/10/ebola_and_open.html
"Fortunately, only mild departures from full open borders are necessary to avert this scary scenario. The obvious keyhole solution: Instead of freely admitting everyone from affected countries, freely admit everyone from affected countries who provides a clean bill of health and accepts a standard 21-day quarantine.

On balance, then, horrible contagious diseases like Ebola make open borders look better, not worse. In the short-run, token restrictions are enough to prevent spreading Ebola from the Third World to the First. And in the long-run, open borders is the quickest, surest way to make diseases of poverty history."