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10.1007/s40121-021-00475-x

http://scihub22266oqcxt.onion/10.1007/s40121-021-00475-x
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suck abstract from ncbi


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pmid34155471      Infect+Dis+Ther 2021 ; ä (ä): 1-14
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  • In Search of the SARS-CoV-2 Protection Correlate: Head-to-Head Comparison of Two Quantitative S1 Assays in Pre-characterized Oligo-/Asymptomatic Patients #MMPMID34155471
  • Rubio-Acero R; Castelletti N; Fingerle V; Olbrich L; Bakuli A; Wolfel R; Girl P; Muller K; Jochum S; Strobl M; Hoelscher M; Wieser A
  • Infect Dis Ther 2021[Jun]; ä (ä): 1-14 PMID34155471show ga
  • BACKGROUND: Quantitative serological assays detecting response to SARS-CoV-2 are needed to quantify immunity. This study analyzed the performance and correlation of two quantitative anti-S1 assays in oligo-/asymptomatic individuals from a population-based cohort. METHODS: In total, 362 plasma samples (108 with reverse transcription-polymerase chain reaction [RT-PCR]-positive pharyngeal swabs, 111 negative controls, and 143 with positive serology without confirmation by RT-PCR) were tested with quantitative assays (Euroimmun Anti-SARS-CoV-2 QuantiVac enzyme-linked immunosorbent assay [EI-S1-IgG-quant]) and Roche Elecsys((R)) Anti-SARS-CoV-2 S [Ro-RBD-Ig-quant]), which were compared with each other and confirmatory tests, including wild-type virus micro-neutralization (NT) and GenScript((R))cPass. Square roots R of coefficients of determination were calculated for continuous variables and non-parametric tests were used for paired comparisons. RESULTS: Quantitative anti-S1 serology correlated well with each other (true positives, 96%; true negatives, 97%). Antibody titers decreased over time (< 30 to > 240 days after initial positive RT-PCR). Agreement with GenScript-cPass was 96%/99% for true positives and true negatives, respectively, for Ro-RBD-Ig-quant and 93%/97% for EI-S1-IgG-quant. Ro-RBD-Ig-quant allowed distinct separation between positives and negatives, and less non-specific reactivity versus EI-S1-IgG-quant. Raw values (95% CI) >/= 28.7 U/mL (22.6-36.4) for Ro-RBD-Ig-quant and >/= 49.8 U/mL (43.4-57.1) for EI-S1-IgG-quant predicted NT > 1:5 in 95% of cases. CONCLUSIONS: Our findings suggest both quantitative anti-S1 assays (EI-S1-IgG-quant and Ro-RBD-Ig-quant) may replace direct neutralization assays in quantitative measurement of immune protection against SARS-CoV-2 in certain circumstances. However, although the mean antibody titers for both assays tended to decrease over time, a higher proportion of Ro-RBD-Ig-quant values remained positive after 240 days. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s40121-021-00475-x.
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