Susan Lichtenstein was attending an industry event, aptly named the Business Travel Show, in London at the end of February. By the last day of the conference, the novel coronavirus that had emerged from Wuhan, China, in late December had become the main point of conversation. By the time she reached Heathrow Airport to head home to Palm Beach, Fla., social distancing—before it entered the international lexicon—was already in action as she describes a scene of frenzied travelers concerned about keeping their distance from others.

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