Outcomes and costs of coronavirus disease (COVID-19) contact tracing are limited. During March–May 2020, we constructed transmission chains from 184 index cases and 1,499 contacts in Salt Lake County, Utah, USA, to assess outcomes and estimate staff time and salaries. We estimated 1,102 staff hours and $29,234 spent investigating index cases and contacts. Among contacts, 374 (25%) had COVID-19; secondary case detection rate was ≈31% among first-generation contacts, ≈16% among second- and third-generation contacts, and 12% among fourth-, fifth-, and sixth-generation contacts. At initial interview, 51% (187) of contacts were COVID-19–positive; 35% (98/277) became positive during 14-day quarantine. Median time from symptom onset to investigation was 7 days for index cases and 4 days for first-generation contacts. Contact tracing reduced the number of cases between contact generations and time between symptom onset and investigation but required substantial resources. Our findings can help jurisdictions allocate resources for contact tracing.

冠状病毒病 (COVID-19) 接触者追踪的结果和成本是有限的。2020 年 3 月至 5 月期间，我们从美国犹他州盐湖县的 184 个指示病例和 1,499 名接触者构建了传播链，以评估结果并估算员工时间和工资。我们估计有 1,102 个工作时间和 29,234 美元用于调查指示病例和接触者。在接触者中，374 人（25%）患有 COVID-19；继发病例检出率在第一代接触者中约为 31%，在第二代和第三代接触者中约为 16%，在第四代、第五代和第六代接触者中约为 12%。在初次面谈时，51% (187) 的接触者为 COVID-19 阳性；35% (98/277) 在 14 天隔离期间呈阳性。指示病例从症状出现到调查的中位时间为 7 天，第一代接触者为 4 天。接触者追踪减少了接触代之间的病例数以及症状出现和调查之间的时间，但需要大量资源。我们的发现可以帮助司法管辖区分配资源以进行接触者追踪。