Evaluation of a chemiluminescent enzyme immunoassay-based high-throughput SARS-CoV-2 antigen assay for the diagnosis of COVID-19: The VITROS® SARS-CoV-2 Antigen Test

J Med Virol. 2021 Dec;93(12):6778-6781. doi: 10.1002/jmv.27153. Epub 2021 Aug 12.


A high-throughput, fully automated antigen detection test for SARS-CoV-2 is a viable alternative to reverse-transcription polymerase chain reaction (RT-qPCR) for mass screening during outbreaks. In this study, we compared RT-qPCR for viral load and the VITROS® SARS-CoV-2 Antigen Test with reference to the results of the LUMIPULSE® SARS-CoV-2 Ag Test. Of 128 nasopharyngeal swab specimens taken from patients suspected of being infected with SARS-CoV-2, 49 were positive and 79 were negative according to RT-qPCR. Consistent dose-dependent detection with VITROS® assay was successfully achieved when using nasopharyngeal swab specimens with Ct values of 32.0 or lesser, whereas the CLEIA-based LUMIPULSE® assay was able to detect lower viral loads compared with the VITROS® assay. Our results show that the performance of the VITROS® assay was satisfactory for the diagnosis of contagious COVID-19 patients in the clinical setting. Highlights The performance of the VITROS® SARS-CoV-2 Antigen Test was sufficient for the diagnosis of contagious COVID-19. This test showed high sensitivity and specificity in the detection of SARS-CoV-2 in samples with a Ct value of 32 or less.

Keywords: CLEIA; COVID-19; RT-qPCR; SARS-CoV-2; nasopharyngeal swab.

MeSH terms

  • Antigens, Viral / genetics
  • Antigens, Viral / immunology
  • COVID-19 / diagnosis*
  • COVID-19 / immunology*
  • COVID-19 / virology
  • COVID-19 Serological Testing / methods*
  • COVID-19 Testing / methods*
  • Humans
  • Immunoenzyme Techniques / methods*
  • Immunologic Tests / methods*
  • Mass Screening / methods
  • Nasopharynx / immunology
  • Nasopharynx / virology
  • RNA, Viral / genetics
  • RNA, Viral / immunology
  • Real-Time Polymerase Chain Reaction / methods
  • SARS-CoV-2 / genetics
  • SARS-CoV-2 / immunology*
  • Sensitivity and Specificity
  • Viral Load / genetics
  • Viral Load / immunology


  • Antigens, Viral
  • RNA, Viral