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Volume 27, Number 12—December 2021

Coronavirus Disease Contact Tracing Outcomes and Cost, Salt Lake County, Utah, USA, March–May 2020

Victoria L. Fields, Ian T. Kracalik, Christina Carthel, Adriana Lopez, Amy Schwartz, Nathaniel M. Lewis, Mackenzie Bray, Carlene Claflin, Kilee Jorgensen, Ha Khong, Walter Richards, Ilene Risk, Maureen Smithee, Madison Clawson, Lee Cherie Booth, Tara Scribellito, Jason Lowry, Jessica Huynh, Linda Davis, Holly Birch, Tiffany Tran, Joseph Walker, Alicia Fry, Aron Hall, Jodee Baker, Eric Pevzner, Angela C. Dunn, Jacqueline E. Tate, Hannah L. Kirking, Tair Kiphibane, and Cuc H. TranComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (V.L. Fields, I.T. Kracalik, A. Lopez, A. Schwartz, N.M, Lewis, T. Tran, J. Walker, A. Fry, A. Hall, E. Pevzner, J.E. Tate, H.L. Kirking, C.H. Tran); Salt Lake County Health Department, Salt Lake City, Utah, USA (C. Carthel, M. Bray, C. Claflin, K. Jorgensen, H. Khong, W. Richards, I. Risk, M. Smithee, M. Clawson, L.C. Booth, T. Scribellito, J. Lowry, J. Huynh, L. Davis, H. Birch, A.C. Dunn, T. Kiphibane); Utah Department of Health, Salt Lake City (J. Baker)

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Number of contacts identified and COVID-19 status by generation among persons during COVID-19 contact tracing, Salt Lake County, Utah, USA, March–May 2020*

Generation Final status† No. (%) No. contacts/no. index cases investigated‡ No. contacts traced to identify 1 case (mean)§
All, n = 1,499 Confirmed case 285 (19) 1.55 5.26 (4.01)
Probable case 89 (6) 0.48 16.84 (4.01)
Not a case 1,029 (69) 5.59 1.46 (NA)

Unreachable or out of jurisdiction
96 (6)
15.61 (NA)
First, n = 922 Confirmed case 223 (24) 1.21 4.13 (3.22)
Probable case 63 (7) 0.34 14.63 (3.22)
Not a case 588 (64) 3.20 1.57 (NA)

Unreachable or out of jurisdiction
48 (5)
19.21 (NA)
Second, n = 387 Confirmed case 43 (11) 0.23 9.00 (6.45)
Probable case 17 (4) 0.09 22.76 (6.45)
Not a case 304 (79) 1.65 1.27 (NA)

Unreachable or out of jurisdiction
23 (6)
16.83 (NA)
Third, n = 99 Confirmed case 10 (10) 0.05 9.90 (5.82)
Probable case 7 (7) 0.04 14.14 (5.82)
Not a case 73 (74) 0.40 1.36 (NA)

Unreachable or out of jurisdiction
9 (9)
11.00 (NA)
Fourth–sixth, n = 91 Confirmed case 9 (10) 0.05 10.11 (8.27)
Probable case 2 (2) 0.01 45.50 (8.27)
Not a case 64 (70) 0.35 1.42 (NA)
Unreachable or out of jurisdiction 16 (18) 0.09 5.69 (NA)

*COVID-19, coronavirus disease; NA, not applicable. †Contacts were categorized as follows: confirmed cases comprised symptomatic-positive persons, asymptomatic-positive persons, and persons with unknown symptoms who tested positive; probable cases comprised symptomatic persons who were not tested; not a case comprised asymptomatic persons who were not tested, asymptomatic-negative persons, and symptomatic-negative persons. See Appendix for each generation breakdown by final status. ‡The number of contacts per index case investigated was calculated by dividing the number of contacts in each category by the 184 index cases. §The number of contacts traced to find a confirmed or probable case in each generation was calculated by dividing the total number of contacts (n = 1,499) by the number of cases in each category.

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Page created: September 09, 2021
Page updated: November 19, 2021
Page reviewed: November 19, 2021
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.