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Observational Study
. 2021 Oct;54(5):816-829.
doi: 10.1016/j.jmii.2021.02.003. Epub 2021 Feb 23.

Multicenter evaluation of four immunoassays for the performance of early diagnosis of COVID-19 and assessment of antibody responses of patients with pneumonia in Taiwan

Affiliations
Observational Study

Multicenter evaluation of four immunoassays for the performance of early diagnosis of COVID-19 and assessment of antibody responses of patients with pneumonia in Taiwan

Yi-Chun Lin et al. J Microbiol Immunol Infect. 2021 Oct.

Abstract

Background/purpose: Our study goals were to evaluate the diagnostic performance of four anti-SARS-CoV-2 antibodies tests and the differences in dynamic immune responses between COVID-19 patients with and without pneumonia.

Methods: We collected 184 serum samples from 70 consecutively qRT-PCR-confirmed COVID-19 patients at four participating hospitals from 23 January 2020 to 30 September 2020. COVID-19 pneumonia was defined as the presence of new pulmonary infiltration. Serum samples were grouped by the duration after symptom onset on a weekly basis for antibody testing and analysis. The four immunoassays: Beckman SARS-CoV-2 IgG/IgM (Beckman Test), Siemens (ADVIA Centaur®) SARS-CoV-2 Total (COV2T) (Siemens Test), SBC COVID-19 IgG ELISA (SBC Test) and EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research (EliA Test) were used for detecting the SARS-CoV-2 specific antibodies.

Results: The sensitivity of all tests reached 100% after 42 days of symptom onset. Siemens Test, the only test detecting total anti-SARS-CoV-2 antibodies, had the best performance in the early diagnosis of COVID-19 infection (day 0-7: 77%; day 8-14: 95%) compared to the other 3 serological tests. All tests showed 100% specificity except SBC Test (98%). COVID-19 patients with pneumonia had significantly higher testing signal values than patients without pneumonia (all p values < 0.05, except EliA IgM Test). However, Siemens Test and SBC Test had highest probability in early prediction of the presence of COVID-19 pneumonia.

Conclusion: Chronological analysis of immune response among COVID-19 patients with different serological tests provides important information in the early diagnosis of SARS-CoV-2 infection and prediction of the risk of pneumonia after infection.

Keywords: Antibody responses; COVID-19; False positive; Immunoassays; Pneumonia.

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Conflict of interest statement

Declaration of competing interest All authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Percentage of serum samples showing positive antibody findings when examined using the four studied serological assays after symptom onset. (A) Positive results of Beckman SARS-CoV-2 IgG/IgM (positive results of either IgG or IgM), Siemens SARS-CoV-2 Total (COV2T), SBC COVID-19 IgG ELISA Kit, and EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research (positive results of either IgG, IgM, or IgA), (B) Positive results of Beckman SARS-CoV-2 IgG, Beckman SARS-CoV-2 IgM, and Beckman SARS-CoV-2 IgG/IgM (positive results of either IgG or IgM), (C) positive results of EliA SARS-CoV-2-Sp1 IgG P2 Research EliA SARS-CoV-2-Sp1 IgM P2 Research, EliA SARS-CoV-2-Sp1 IgA P2 Research, and EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research (positive results of either IgG, IgM, or IgA).
Fig. 2
Fig. 2
Signal values of the four immunoassays for anti-SARS-CoV-2 antibodies detection after symptom onset (A) Beckman SARS-CoV-2 IgG/IgM, (B) Siemens SARS-CoV-2 Total (COV2T), (C) SBC COVID-19 IgG ELISA Kit, and (D) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research.
Fig. 3
Fig. 3
Comparison of signal values of the four immunoassays in patients with COVID-19 with or without pneumonia (A) Beckman SARS-CoV-2 IgG/IgM-IgG, (B) Beckman SARS-CoV-2 IgG/IgM–IgM, (C) Siemens SARS-CoV-2 Total (COV2T), (D) SBC COVID-19 IgG ELISA Kit, (E) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgG, (F) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgM, (G) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgA.
Fig. 3
Fig. 3
Comparison of signal values of the four immunoassays in patients with COVID-19 with or without pneumonia (A) Beckman SARS-CoV-2 IgG/IgM-IgG, (B) Beckman SARS-CoV-2 IgG/IgM–IgM, (C) Siemens SARS-CoV-2 Total (COV2T), (D) SBC COVID-19 IgG ELISA Kit, (E) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgG, (F) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgM, (G) EliA SARS-CoV-2-Sp1 IgG/IgM/IgA P2 Research-IgA.

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