Frontiers in Immunology (May 2021)

Immunological Biomarkers of Fatal COVID-19: A Study of 868 Patients

  • Esperanza Martín-Sánchez,
  • Esperanza Martín-Sánchez,
  • Esperanza Martín-Sánchez,
  • Esperanza Martín-Sánchez,
  • Juan José Garcés,
  • Juan José Garcés,
  • Juan José Garcés,
  • Juan José Garcés,
  • Catarina Maia,
  • Catarina Maia,
  • Catarina Maia,
  • Catarina Maia,
  • Susana Inogés,
  • Susana Inogés,
  • Susana Inogés,
  • Ascensión López-Díaz de Cerio,
  • Ascensión López-Díaz de Cerio,
  • Ascensión López-Díaz de Cerio,
  • Francisco Carmona-Torre,
  • Francisco Carmona-Torre,
  • Francisco Carmona-Torre,
  • Marta Marin-Oto,
  • Félix Alegre,
  • Elvira Molano,
  • Mirian Fernandez-Alonso,
  • Mirian Fernandez-Alonso,
  • Cristina Perez,
  • Cristina Perez,
  • Cristina Perez,
  • Cirino Botta,
  • Aintzane Zabaleta,
  • Aintzane Zabaleta,
  • Aintzane Zabaleta,
  • Aintzane Zabaleta,
  • Ana Belen Alcaide,
  • Manuel F. Landecho,
  • Marta Rua,
  • Teresa Pérez-Warnisher,
  • Laura Blanco,
  • Laura Blanco,
  • Sarai Sarvide,
  • Sarai Sarvide,
  • Sarai Sarvide,
  • Amaia Vilas-Zornoza,
  • Amaia Vilas-Zornoza,
  • Amaia Vilas-Zornoza,
  • Diego Alignani,
  • Diego Alignani,
  • Diego Alignani,
  • Diego Alignani,
  • Cristina Moreno,
  • Cristina Moreno,
  • Cristina Moreno,
  • Iñigo Pineda,
  • Miguel Sogbe,
  • Josepmaria Argemi,
  • Bruno Paiva,
  • Bruno Paiva,
  • Bruno Paiva,
  • Bruno Paiva,
  • José Ramón Yuste,
  • José Ramón Yuste,
  • José Ramón Yuste

DOI
https://doi.org/10.3389/fimmu.2021.659018
Journal volume & issue
Vol. 12

Abstract

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Information on the immunopathobiology of coronavirus disease 2019 (COVID-19) is rapidly increasing; however, there remains a need to identify immune features predictive of fatal outcome. This large-scale study characterized immune responses to severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection using multidimensional flow cytometry, with the aim of identifying high-risk immune biomarkers. Holistic and unbiased analyses of 17 immune cell-types were conducted on 1,075 peripheral blood samples obtained from 868 COVID-19 patients and on samples from 24 patients presenting with non-SARS-CoV-2 infections and 36 healthy donors. Immune profiles of COVID-19 patients were significantly different from those of age-matched healthy donors but generally similar to those of patients with non-SARS-CoV-2 infections. Unsupervised clustering analysis revealed three immunotypes during SARS-CoV-2 infection; immunotype 1 (14% of patients) was characterized by significantly lower percentages of all immune cell-types except neutrophils and circulating plasma cells, and was significantly associated with severe disease. Reduced B-cell percentage was most strongly associated with risk of death. On multivariate analysis incorporating age and comorbidities, B-cell and non-classical monocyte percentages were independent prognostic factors for survival in training (n=513) and validation (n=355) cohorts. Therefore, reduced percentages of B-cells and non-classical monocytes are high-risk immune biomarkers for risk-stratification of COVID-19 patients.

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