COVID-19 Case Investigation and Contact Tracing Efforts from Health Departments — United States, June 25–July 24, 2020

January 22, 2021

Kimberly D. Spencer, MSPH; Christina L. Chung, MPH; Alison Stargel, MPH; Alvin Shultz, MSPH; Phoebe G. Thorpe, MD; Marion W. Carter, PhD; Melanie M. Taylor, MD; Mary McFarlane, PhD; Dale Rose, PhD; Margaret A. Honein, PhD; Henry Walke, MD

Morbidity and Mortality Weekly Report (MMWR)

Spencer et al. studied case investigation and contact tracing data from 56 CDC-funded state, local, and territorial health departments between June and July 2020. Using SAS software, the authors performed descriptive analyses to identify associations between SARS-CoV-2 transmission and four key metrics: 1. average caseload per case investigator, average tracing load, and staffing method, 2. case investigation timeliness, 3. contact tracing timeliness, and 4. contact tracing yield. The results showed a median of 57% of patients were interviewed within 24 hours of the case report and an average of 1.15 contacts were identified per patient to trace, of which 55% were notified within 24 hours of identification by the patient. All health departments with higher caseloads showed lower percentages of patients interviewed in the first 24 hours and lower numbers of contacts identified per interview. Thus, this study demonstrates an association between timeliness and caseload and reinforces the significance of increasing staffing and enhancing awareness regarding state and local health department contact tracing workload.

Spencer KD, Chung CL, Stargel A, et al. COVID-19 Case Investigation and Contact Tracing Efforts from Health Departments — United States, June 25–July 24, 2020. MMWR Morb Mortal Wkly Rep 2021; 70: 83–7.

Partners