Head-to-Head Accuracy Comparison of Three Commercial COVID-19 IgM/IgG Serology Rapid Tests Academic Article uri icon

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  • Background: Comparative data of SARS-CoV-2 IgM/IgG serology rapid diagnostic tests (RDTs) is scarce. We thus performed a head-to-head comparison of three RDTs. Methods: In this unmatched case-control study, blood samples from 41 RT-PCR-confirmed COVID-19 cases and 50 negative controls were studied. The diagnostic accuracy of three commercially available COVID-19 RDTs: NTBIO (RDT-A), Orient-Gene (RDT-B), and MEDsan (RDT-C), against both a recombinant spike-expressing immunofluorescence assay (rIFA) and Euroimmun IgG ELISA, was assessed. RDT results concordant with the reference methods, and between whole blood and plasma, were established by the Kendall coefficient. Results: COVID-19 cases’ median time from RT-PCR to serology was 22 days (interquartile range (IQR) 13–31 days). Whole-blood IgG detection with RDT-A, -B, and -C showed 0.93, 0.83, and 0.98 concordance with rIFA. Against rIFA, RDT-A sensitivity (SN) was 92% (95% CI: 78–98) and specificity (SP) 100% (95% CI: 91–100), RDT-B showed 87% SN (95% CI: 72–95) and 98% SP (95% CI: 88–100), and RDT-C 100% SN (95% CI: 88–100) and 98% SP (95% CI: 88–100). Against ELISA, SN and SP were above 90% for all three RDTs. Conclusions: RDT-A and RDT-C displayed IgG detection SN and SP above 90% in whole blood. These RDTs could be considered in the absence of routine diagnostic serology facilities.


  • Andrey, Diego O
  • Cohen, Patrick
  • Meyer, Benjamin
  • Torriani, Giulia
  • Yerly, Sabine
  • Mazza, Lena
  • Calame, Adrien
  • Arm-Vernez, Isabelle
  • Guessous, Idris
  • Stringhini, Silvia
  • Roux-Lombard, Pascale
  • Fontao, Lionel
  • Agoritsas, Thomas
  • Stirnemann, Jerôme
  • Reny, Jean-Luc
  • Siegrist, Claire-Anne
  • Eckerle, Isabella
  • Kaiser, Laurent
  • Vuilleumier, Nicolas

publication date

  • July 24, 2020