Article Publish Status: FREE
Abstract Title:

Seven-month kinetics of SARS-CoV-2 antibodies and role of pre-existing antibodies to human coronaviruses.

Abstract Source:

Nat Commun. 2021 Aug 6 ;12(1):4740. Epub 2021 Aug 6. PMID: 34362897

Abstract Author(s):

Natalia Ortega, Marta Ribes, Marta Vidal, Rocío Rubio, Ruth Aguilar, Sarah Williams, Diana Barrios, Selena Alonso, Pablo Hernández-Luis, Robert A Mitchell, Chenjerai Jairoce, Angeline Cruz, Alfons Jimenez, Rebeca Santano, Susana Méndez, Montserrat Lamoglia, Neus Rosell, Anna Llupià, Laura Puyol, Jordi Chi, Natalia Rodrigo Melero, Daniel Parras, Pau Serra, Edwards Pradenas, Benjamin Trinité, Julià Blanco, Alfredo Mayor, Sonia Barroso, Pilar Varela, Anna Vilella, Antoni Trilla, Pere Santamaria, Carlo Carolis, Marta Tortajada, Luis Izquierdo, Ana Angulo, Pablo Engel, Alberto L García-Basteiro, Gemma Moncunill, Carlota Dobaño

Article Affiliation:

Natalia Ortega


Unraveling the long-term kinetics of antibodies to SARS-CoV-2 and the individual characteristics influencing it, including the impact of pre-existing antibodies to human coronaviruses causing common cold (HCoVs), is essential to understand protective immunity to COVID-19 and devise effective surveillance strategies. IgM, IgA and IgG levels against six SARS-CoV-2 antigens and the nucleocapsid antigen of the four HCoV (229E, NL63, OC43 and HKU1) were quantified by Luminex, and antibody neutralization capacity was assessed by flow cytometry, in a cohort of health care workers followed up to 7 months (N = 578). Seroprevalence increases over time from 13.5% (month 0) and 15.6% (month 1) to 16.4% (month 6). Levels of antibodies, including those with neutralizing capacity, are stable over time, except IgG to nucleocapsid antigen and IgM levels that wane. After the peak response, anti-spike antibody levels increase from ~150 days post-symptom onset in all individuals (73% for IgG), in the absence of any evidence of re-exposure. IgG and IgA to HCoV are significantly higher in asymptomatic than symptomatic seropositive individuals. Thus, pre-existing cross-reactive HCoVs antibodies could havea protective effect against SARS-CoV-2 infection and COVID-19 disease.

Study Type : Human Study

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