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Trump considering blocking Americans from returning to the U.S. if they’re suspected of having the coronavirus.

 

President Trump is considering new immigration regulations that would allow border officials to temporarily block American citizens and legal permanent residents from returning to the United States from abroad if authorities believe they may be infected with the coronavirus.

In recent months, Mr. Trump has imposed sweeping rules that ban entry by foreigners into the United States, citing the risk of allowing the virus to spread from hot spots abroad. But those rules have exempted two categories of people attempting to return: American citizens and non-citizens who have already established legal residence.

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Why the Coronavirus is More Likely to ‘Superspread’ Than the Flu

For a spiky sphere just 120 nanometers wide, the coronavirus can be a remarkably cosmopolitan traveler.

Spewed from the nose or mouth, it can rocket across a room and splatter onto surfaces; it can waft into poorly ventilated spaces and linger in the air for hours. At its most intrepid, the virus can spread from a single individual to dozens of others, perhaps even a hundred or more at once, proliferating through packed crowds in what is called a superspreading event.

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