Increased anti-nucleocapsid secretory IgA and consumption of complement component 3 in post-COVID syndrome patients.

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Title: Increased anti-nucleocapsid secretory IgA and consumption of complement component 3 in post-COVID syndrome patients.
Authors: Hai Z; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain., Yang W; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain., Ghazi A; Department of Biochemistry and Molecular Biology & Area of Infectious Diseases and AIDS, Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain.; Universidad Complutense de Madrid, Ciudad Universitaria, Madrid, Spain., Buitrago A; Department of Biochemistry and Molecular Biology & Area of Infectious Diseases and AIDS, Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain.; Universidad Complutense de Madrid, Ciudad Universitaria, Madrid, Spain., Marín-García P; Immunology section, Fac. de CC. de la Salud, Departamento de Especialidades Médicas y Salud Pública, Universidad Rey Juan Carlos (URJC), Alcorcón, Spain., Azcárate IG; Microbiology section, Fac. de CC. de la Salud, Departamento de Especialidades Médicas y Salud Pública, Universidad Rey Juan Carlos (URJC), Alcorcón, Spain., González-Escalada A; Microbiology section, Fac. de CC. de la Salud, Departamento de Especialidades Médicas y Salud Pública, Universidad Rey Juan Carlos (URJC), Alcorcón, Spain., Rossi N; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain., Benítez-Cruz J; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain., Estévez-Benito I; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain.; Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain., Tortajada A; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain.; Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain., Regueiro JR; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain.; Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain., Bautista JM; Department of Biochemistry and Molecular Biology & Area of Infectious Diseases and AIDS, Research Institute Hospital 12 de Octubre (imas12), Madrid, Spain.; Universidad Complutense de Madrid, Ciudad Universitaria, Madrid, Spain., Martinez-Quiles N; Department of Immunology, Ophthalmology and ENT, Complutense University School of Medicine, Universidad Complutense de Madrid, Avda de la Complutense, Madrid, Spain.
Source: Frontiers in immunology [Front Immunol] 2026 May 14; Vol. 17, pp. 1822171. Date of Electronic Publication: 2026 May 14 (Print Publication: 2026).
Publication Type: Journal Article
Journal Info: Publisher: Frontiers Research Foundation] Country of Publication: Switzerland NLM ID: 101560960 Publication Model: eCollection Cited Medium: Internet ISSN: 1664-3224 (Electronic) Linking ISSN: 16643224 NLM ISO Abbreviation: Front Immunol Subsets: MEDLINE
Database: MEDLINE Ultimate
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ISSN:1664-3224
DOI:10.3389/fimmu.2026.1822171