Seroprevalence of anti-SARS-CoV-2 antibodies in COVID-19 patients and healthy volunteers up to 6 months post disease onset

Patrícia Figueiredo-Campos, Birte Blankenhaus, Catarina Mota, Andreia Gomes, Marta Serrano, Silvia Ariotti, Catarina Costa, Helena Nunes-Cabaço, António M. Mendes, Pedro Gaspar, M. Conceição Pereira-Santos, Fabiana Rodrigues, Jorge Condeço, M. Antonia Escoval, Matilde Santos, Mario Ramirez, José Melo-Cristino, J. Pedro Simas, Eugenia Vasconcelos, Ângela AfonsoMarc Veldhoen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

141 Citations (Scopus)


SARS-CoV-2 has emerged as a human pathogen, causing clinical signs, from fever to pneumonia—COVID-19—but may remain mild or asymptomatic. To understand the continuing spread of the virus, to detect those who are and were infected, and to follow the immune response longitudinally, reliable and robust assays for SARS-CoV-2 detection and immunological monitoring are needed. We quantified IgM, IgG, and IgA antibodies recognizing the SARS-CoV-2 receptor-binding domain (RBD) or the Spike (S) protein over a period of 6 months following COVID-19 onset. We report the detailed setup to monitor the humoral immune response from over 300 COVID-19 hospital patients and healthcare workers, 2500 University staff, and 198 post-COVID-19 volunteers. Anti-SARS-CoV-2 antibody responses follow a classic pattern with a rapid increase within the first three weeks after symptoms. Although titres reduce subsequently, the ability to detect anti-SARS-CoV-2 IgG antibodies remained robust with confirmed neutralization activity for up to 6 months in a large proportion of previously virus-positive screened subjects. Our work provides detailed information for the assays used, facilitating further and longitudinal analysis of protective immunity to SARS-CoV-2. Importantly, it highlights a continued level of circulating neutralising antibodies in most people with confirmed SARS-CoV-2.
Original languageEnglish
Pages (from-to)2025-2040
Number of pages16
JournalEuropean Journal of Immunology
Issue number12
Publication statusPublished - Dec 2020


  • COVID-19
  • Neutralizing antibodies
  • SARS-CoV-2
  • Seroprevalence


Dive into the research topics of 'Seroprevalence of anti-SARS-CoV-2 antibodies in COVID-19 patients and healthy volunteers up to 6 months post disease onset'. Together they form a unique fingerprint.

Cite this