Infection induced SARS-CoV-2 seroprevalence and heterogeneity of antibody responses in a general population cohort study in Catalonia Spain

Abstract Sparse data exist on the complex natural immunity to SARS-CoV-2 at the population level. We applied a well-validated multiplex serology test in 5000 participants of a general population study in Catalonia in blood samples collected from end June to mid November 2020. Based on responses to f...

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Autores principales: Marianna Karachaliou, Gemma Moncunill, Ana Espinosa, Gemma Castaño-Vinyals, Alfons Jiménez, Marta Vidal, Rebeca Santano, Diana Barrios, Laura Puyol, Anna Carreras, Leonie Mayer, Rocío Rubio, Beatriz Cortés, Vanessa Pleguezuelos, Cristina O’Callaghan-Gordo, Serena Fossati, Ioar Rivas, Delphine Casabonne, Martine Vrijheid, Luis Izquierdo, Ruth Aguilar, Xavier Basagaña, Judith Garcia-Aymerich, Rafael de Cid, Carlota Dobaño, Manolis Kogevinas
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/f2a24c1a840445babe5765c88320b2fc
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Sumario:Abstract Sparse data exist on the complex natural immunity to SARS-CoV-2 at the population level. We applied a well-validated multiplex serology test in 5000 participants of a general population study in Catalonia in blood samples collected from end June to mid November 2020. Based on responses to fifteen isotype-antigen combinations, we detected a seroprevalence of 18.1% in adults (n = 4740), and modeled extrapolation to the general population of Catalonia indicated a 15.3% seroprevalence. Antibodies persisted up to 9 months after infection. Immune profiling of infected individuals revealed that with increasing severity of infection (asymptomatic, 1–3 symptoms, ≥ 4 symptoms, admitted to hospital/ICU), seroresponses were more robust and rich with a shift towards IgG over IgA and anti-spike over anti-nucleocapsid responses. Among seropositive participants, lower antibody levels were observed for those ≥ 60 years vs < 60 years old and smokers vs non-smokers. Overweight/obese participants vs normal weight had higher antibody levels. Adolescents (13–15 years old) (n = 260) showed a seroprevalence of 11.5%, were less likely to be tested seropositive compared to their parents and had dominant anti-spike rather than anti-nucleocapsid IgG responses. Our study provides an unbiased estimate of SARS-CoV-2 seroprevalence in Catalonia and new evidence on the durability and heterogeneity of post-infection immunity.