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Published in: Journal of Clinical Immunology 8/2021

Open Access 01-11-2021 | SARS-CoV-2 | Original Article

Longitudinal Analysis of Inflammatory Response to SARS-CoV-2 in the Upper Respiratory Tract Reveals an Association with Viral Load, Independent of Symptoms

Authors: Diem-Lan Vu, Paola Martinez-Murillo, Fiona Pigny, Maria Vono, Benjamin Meyer, Christiane S. Eberhardt, Sylvain Lemeille, Elodie Von Dach, Géraldine Blanchard-Rohner, Isabella Eckerle, Angela Huttner, Claire-Anne Siegrist, Laurent Kaiser, Arnaud M. Didierlaurent

Published in: Journal of Clinical Immunology | Issue 8/2021

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Abstract

Background

SARS-CoV-2 infection leads to high viral loads in the upper respiratory tract that may be determinant in virus dissemination. The extent of intranasal antiviral response in relation to symptoms is unknown. Understanding how local innate responses control virus is key in the development of therapeutic approaches.

Methods

SARS-CoV-2-infected patients were enrolled in an observational study conducted at the Geneva University Hospitals, Switzerland, investigating virological and immunological characteristics. Nasal wash and serum specimens from a subset of patients were collected to measure viral load, IgA specific for the S1 domain of the spike protein, and a cytokine panel at different time points after infection; cytokine levels were analyzed in relation to symptoms.

Results

Samples from 13 SARS-CoV-2-infected patients and six controls were analyzed. We found an increase in CXCL10 and IL-6, whose levels remained elevated for up to 3 weeks after symptom onset. SARS-CoV-2 infection also induced CCL2 and GM-CSF, suggesting local recruitment and activation of myeloid cells. Local cytokine levels correlated with viral load but not with serum cytokine levels, nor with specific symptoms, including anosmia. Some patients had S1-specific IgA in the nasal cavity while almost none had IgG.

Conclusion

The nasal epithelium is an active site of cytokine response against SARS-CoV-2 that can last more than 2 weeks; in this mild COVID-19 cohort, anosmia was not associated with increases in any locally produced cytokines.
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Literature
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Metadata
Title
Longitudinal Analysis of Inflammatory Response to SARS-CoV-2 in the Upper Respiratory Tract Reveals an Association with Viral Load, Independent of Symptoms
Authors
Diem-Lan Vu
Paola Martinez-Murillo
Fiona Pigny
Maria Vono
Benjamin Meyer
Christiane S. Eberhardt
Sylvain Lemeille
Elodie Von Dach
Géraldine Blanchard-Rohner
Isabella Eckerle
Angela Huttner
Claire-Anne Siegrist
Laurent Kaiser
Arnaud M. Didierlaurent
Publication date
01-11-2021
Publisher
Springer US
Published in
Journal of Clinical Immunology / Issue 8/2021
Print ISSN: 0271-9142
Electronic ISSN: 1573-2592
DOI
https://doi.org/10.1007/s10875-021-01134-z

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