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新冠肺炎疫情暴发以来，追踪接触者成为阻止病毒传播的最有力武器。一些国家推出新冠病毒接触者追踪app，还有一些国家培训并雇用了接触者追踪员，减缓了病毒的传播，为抗击疫情争取了时间。 Holiday beachgoers head to Venice Beach on Memorial Day as coronavirus safety restrictions continue being relaxed in Los Angeles County and nationwide in Los Angeles, California, on May 24, 2020. [Photo/Agencies] Whenever a new infectious disease emerges, contact tracing is public health’s most powerful weapon for tracking transmission and figuring out how best to protect the population. 每当一种新传染病出现时，公共卫生部门就需要追踪传播路径并确定保护国民的最佳方案，而追踪接触者就是其最强大的武器。 But now, as coronavirus cases are surging in hot spots across the United States, the proven strategy’s effectiveness is in doubt: Contact tracing failed to stanch the first wave of coronavirus infections, and today’s far more extensive undertaking will require 100,000 or more trained tracers to delve into strangers’ personal lives and persuade even some without symptoms to stay home. 现在，随着新冠肺炎病例在美国各热点地区大幅增加，这项历经考验的策略的有效性却受到质疑：它没能遏制第一波病毒传染，而且今天这项工作的规模过于庞大，需要至少10万名训练有素的追踪员，探究陌生人的个人生活，甚至劝说一些没有症状的人呆在家里。 | 
