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Volume 27, Number 11—November 2021

Synopsis

Effectiveness of Abbott BinaxNOW Rapid Antigen Test for Detection of SARS-CoV-2 Infections in Outbreak among Horse Racetrack Workers, California, USA

Krishna SurasiComments to Author , Kristin J. Cummings, Carl Hanson, Mary Kate Morris, Maria Salas, David Seftel, Liza Ortiz, Ruwan Thilakaratne, Cameron Stainken, and Debra A. Wadford
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (K. Surasi); California Department of Public Health, Richmond, California, USA (K. Surasi, K.J. Cummings, C. Hanson, M.K. Morris, M. Salas, R. Thilakaratne, C. Stainken, D.A. Wadford); Golden Gate Fields, Berkeley, California, USA (D. Seftel); City of Berkeley Public Health Officer Unit, Berkeley (L. Ortiz); Kaiser Permanente San Francisco Internal Medicine Residency Program, San Francisco, California, USA (C. Stainken); University of California San Francisco School of Medicine, San Francisco (C. Stainken).

Main Article

Table 2

Results of BinaxNOW rapid antigen test compared with real-time reverse transcription PCR for coronavirus disease among all horse racetrack staff undergoing paired testing, California, USA, November–December 2020*

BinaxNOW result
 rRT-PCR result
 Total
Detected
 Not detected
Round 1, n = 333, November 25, 27, 28†
Detected 40 0 40
Not detected 58 235 293
Total
 98
 235
 333
Round 2, n = 197, December 4
Detected 12 0 12
Not detected 10 175 185
Total
 22
 175
 197
Round 3, n = 65, December 13
Detected 2 0 2
Not detected 3 60 63
Total
 5
 60
 65
Round 4, n = 57, December 16
Detected 0 0 0
Not detected 0 57 57
Total
 0
 57
 57
Round 5, n = 58, December 20
Detected 0 0 0
Not detected 1 57 58
Total
 1
 57
 58
Round 6, n = 59, December 22
Detected 1 0 1
Not detected 0 58 58
Total
 1
 58
 59
Overall, N = 769, November 25–December 22
Detected 55 0 55
Not detected 72 642 714
Total 127 642 769

*Inconclusive (n = 4) and invalid (n = 3) rRT-PCR test results excluded from table. rRT-PCR, real-time reverse transcription PCR. †All employees who had not yet tested positive were meant to return for subsequent testing rounds. However, participant attrition occurred, likely because of employees leaving their jobs or logistical obstacles to being on-site for testing during mass testing days.

Main Article

Page created: August 18, 2021
Page updated: October 19, 2021
Page reviewed: October 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.
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