Medizinische Universität Graz - Research portal
Navigation/Search
- Researchers
- Institutions
- Projects
- Publications
- Partners
- Sponsors
- Equipment
- Knowhow
- Fields of Research
"Faces" of the day:
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Rubio-Acero, R; Castelletti, N; Fingerle, V; Olbrich, L; Bakuli, A; Wölfel, R; Girl, P; Müller, K; Jochum, S; Strobl, M; Hoelscher, M; Wieser, A, , KoCo19, study, team.
In Search of the SARS-CoV-2 Protection Correlate: Head-to-Head Comparison of Two Quantitative S1 Assays in Pre-characterized Oligo-/Asymptomatic Patients.
Infect Dis Ther. 2021; 10(3):1505-1518
Doi: 10.1007/s40121-021-00475-x
[OPEN ACCESS]
Web of Science
PubMed
FullText
FullText_MUG
- Study Group Members Med Uni Graz:
- Klugherz Isabel
- Altmetrics:
- Dimensions Citations:
- Plum Analytics:
- Scite (citation analytics):
- Abstract:
- 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® 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®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.
- Find related publications in this database (Keywords)
- COVID-19
- Direct virus neutralization assay S1
- Quantitative serology
- SARS-CoV-2