Public-health travel bans are nearly always controversial, benwallacewells writes, because they engage central political tensions between contagion control and individual freedom, and between the health of one country and the well-being of the world.
to be truly effective. The U.S. imposed the ban only after forty-five other countries had already done so, after-19 cases had been documented within the U.S. It also did so selectively, so that Americans and their dependents could travel unimpeded.
Studies of the first phases of the pandemic have shown exactly how much it matters. Fifteen years ago, Alessandro Vespignani, a physicist at Northeastern, developed a model that simulates all human movement around the globe in order to predict, as minutely as possible, how diseases might spread. “Essentially, we built a synthetic world,” Vespignani told me.
I asked Vespignani whether he thought that the travel bans would at least suppress the number of cases in the United States. He started shaking his head midway through the question. “It’s like you are trying to prevent sparks from entering the forest, but the wildfires are already starting,” he said.
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