Kinetics of the Severe Acute Respiratory Syndrome Coronavirus 2 Antibody Response and Serological Estimation of Time Since Infection
Stéphane Pelleau, Tom Woudenberg, Jason Rosado, Françoise Donnadieu, Laura García, Thomas Obadia, Soazic Gardais, Yasmine Elgharbawy, Aurélie Velay, Maria Gonzalez, Jacques Yves Nizou, Nizar Khelil, Konstantinos Zannis, Charlotte Cockram, Sarah H. Merkling, Annalisa Meola, Solen Kernéis, Benjamin Terrier, de Sèze, Delphine Planas, Olivier Schwartz, François Déjardin, Stéphane Pêtres, Cassandre Von Platen, Sandrine Fernandes Pellerin, Laurence Arowas, Louise Perrin de Facci, Darragh Duffy, Clíona Ní Cheallaigh, Jean Dunne, Niall Conlon, Liam Townsend, Veasna Duong, Heidi Auerswald, Laurie Pinaud, Laura Tondeur, Marija Backović, Bruno Hoen, Arnaud Fontanet, Ivo Müeller, Samira Fafi‐Kremer, Timothée Bruel, Michael White
Abstract
BACKGROUND: Infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) induces a complex antibody response that varies by orders of magnitude between individuals and over time. METHODS: We developed a multiplex serological test for measuring antibodies to 5 SARS-CoV-2 antigens and the spike proteins of seasonal coronaviruses. We measured antibody responses in cohorts of hospitalized patients and healthcare workers followed for up to 11 months after symptoms. A mathematical model of antibody kinetics was used to quantify the duration of antibody responses. Antibody response data were used to train algorithms for estimating time since infection. RESULTS: One year after symptoms, we estimate that 36% (95% range, 11%-94%) of anti-Spike immunoglobulin G (IgG) remains, 31% (95% range, 9%-89%) anti-RBD IgG remains, and 7% (1%-31%) of anti-nucleocapsid IgG remains. The multiplex assay classified previous infections into time intervals of 0-3 months, 3-6 months, and 6-12 months. This method was validated using data from a seroprevalence survey in France, demonstrating that historical SARS-CoV-2 transmission can be reconstructed using samples from a single survey. CONCLUSIONS: In addition to diagnosing previous SARS-CoV-2 infection, multiplex serological assays can estimate the time since infection, which can be used to reconstruct past epidemics.