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
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.