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Volume 27, Number 11—November 2021

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).

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Table 3

BinaxNOW rapid antigen test performance compared with real-time reverse transcription PCR for coronavirus disease in using 2 different cycle threshold values to define positive results, California, USA, November–December 2020*

BinaxNOW performance % (95% CI)
Ct <37† Ct <30‡
PPA 43.3 (34.6–52.4) 55.6 (45.2–65.6)
NPA 100.0 (99.4–100.0) 100.0 (99.5–100)
PPV 100.0 (93.5–100.0) 100.0 (93.5–100)
NPV 89.9 (87.5–92.0) 93.8 (91.8–95.5)

*Results for 769 paired specimens from 342 horse racetrack staff. Ct, cycle threshold; NPA, negative percent agreement; NPV, negative predictive value; PPA, positive percent agreement; PPV, positive predictive value; rRT-PCR, real-time reverse transcription PCR. †127 rRT-PCR–positive specimens. ‡100 rRT-PCR–positive specimens.

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