BackgroundThe Elecsys(R) Anti-SARS-CoV-2 electrochemiluminescence immunoassay (Roche Diagnostics International Ltd) was developed for the in vitro qualitative detection of antibodies to SARS-CoV-2. We evaluated the sensitivity of the Elecsys Anti-SARS-CoV-2 immunoassay in samples from a diverse cross-section of patients across multiple sites and compared results against commercially available comparators.
MethodsSensitivity of the Elecsys Anti-SARS-CoV-2 immunoassay was evaluated using anonymised, frozen, residual single and sequential serum and plasma samples from patients with polymerase chain reaction (PCR)-confirmed SARS-CoV-2 infection MESHD
. Point estimates and 95% confidence intervals (CIs) were calculated and method comparisons performed versus the following comparator assays: Euroimmun Anti-SARS-CoV-2 IgG, Abbott ARCHITECT SARS-CoV-2 IgG, Siemens ADVIA Centaur SARS-CoV-2 Total MESHD
, and YHLO iFlash SARS-CoV-2 IgG MESHD
ResultsOverall sensitivity for the Elecsys Anti-SARS-CoV-2 immunoassay in 219 samples drawn [≥]14 days post-PCR confirmation was 93.6% (95% CI 89.5-96.5). Across the three study sites, sensitivity in samples drawn [≥]14 days post-PCR confirmation ranged from 85.7-98.9%. Sensitivity was significantly higher for the Elecsys Anti-SARS-CoV-2 immunoassay compared with the YHLO iFlash SARS-CoV-2 IgM assay for samples drawn [≥]14 days post-PCR confirmation (86.3% [95% CI 76.7-92.9] versus 33.8% [95% CI 23.6-45.2]). Both Siemens ADVIA Centaur SARS-CoV-2 Total MESHD
and YHLO iFlash SARS-CoV-2 MESHD
IgG assays had a significantly higher sensitivity compared with the Elecsys Anti-SARS-CoV-2 immunoassay for samples drawn [≥]14 days post-PCR confirmation (95.1% [95% CI 87.8-98.6] versus 85.2% [95% CI 75.6-92.1]; 93.8% [95% CI 86.0-97.9] versus 86.3% [95% CI 76.7-92.9]). Differences in sensitivity between the Elecsys Anti-SARS-CoV-2 immunoassay and the Euroimmun Anti-SARS-CoV-2 IgG (90.3% [95% CI 83.7-94.9] versus 95.2% [95% CI 89.8-98.2]) and Abbott ARCHITECT SARS-CoV-2 MESHD
IgG (84.8% [95% CI 75.0-91.9] versus 87.3% [95% CI 78.0-93.8]) assays for samples drawn [≥]14 days post-PCR confirmation were not significant.
ConclusionsThe Elecsys Anti-SARS-CoV-2 immunoassay demonstrated high sensitivity in samples collected [≥]14 days post-PCR confirmation of SARS-CoV-2 infection MESHD
, and comparable sensitivity to several commercially available comparator assays across multiple sites, supporting the use of this assay as a tool to aid HGNC
in determination of previous exposure to SARS-CoV-2.
Required information for submission systemO_ST_ABSEthical guidelinesC_ST_ABSThe study was conducted in accordance with the study protocol provided by Roche Diagnostics and in accordance with the principles of the Declaration of Helsinki. All human samples utilised at the three study sites in Germany (Augsburg, Heidelberg, Berlin) were anonymised, frozen, residual samples, therefore no ethical approval or waiver was required in accordance with local legislation from ZEKO (Central Ethics Commission at the German Medical Association). A statement was obtained from the Ethics Committee of the Landesarztekammer Bayern confirming that there are no objections to the coherent use of anonymised residual samples.
Research reporting guidelinesPlease see separate STARD checklist.
Data availability statementQualified researchers may request access to individual patient level data through the clinical study data request platform (https://vivli.org/). Further details on Roches criteria for eligible studies are available here: https://vivli.org/members/ourmembers/. For further details on Roches Global Policy on the Sharing of Clinical Information and how to request access to related clinical study documents, see here: https://www.roche.com/research_and_development/who_we_are_how_we_work/clinical_trials/our_commitment_to_data_sharing.htm