RT info:eu-repo/semantics/article T1 Unbiased immunome characterisation correlates with COVID-19 mRNA vaccine failure in immunocompromised adults A1 H-Vázquez, Juan A1 Cal-Sabater, Paloma A1 Arribas-Rodríguez, Elisa A1 Fiz-López, Aida A1 Perez-Segurado, Candido A1 Martín-Muñoz, Álvaro A1 De Prado, Ángel A1 Perez Mazzali, Marina A1 de Castro, Carolina G. A1 del Hierro, Alejandro G. A1 de la Fuente Graciani, Ignacio A1 Pérez González, Sonia A1 Gutiérrez, Sara A1 Tellería, Pablo A1 Novoa, Cristina A1 Rojo Rello, Silvia A1 Garcia-Blesa, Antonio A1 Sedano, Rosa A1 Martínez García, Ana María A1 Garcinuño Pérez, Sonsoles A1 Domínguez-Gil, Marta A1 Hernán García, Cristina A1 Guerra, Ma Mercedes A1 Muñoz-Sánchez, Eduardo A1 Barragan-Pérez, Cristina A1 Diez Morales, Soraya A1 Casazza Donnarumma, Oriana A1 Ramos Pollo, Daniel A1 Santamarta Solla, Natalia A1 Álvarez Manzanares, Paula Ma A1 Bravo, Sara A1 García Alonso, Cristina A1 Avendaño Fernández, Luis Alberto A1 Gay Alonso, Jenifer A1 Garrote, José A. A1 Arranz, Eduardo A1 Eiros, José María A1 Rescalvo Santiago, Fernando A1 Quevedo Villegas, Carolina A1 Tamayo, Eduardo A1 Orduña, Antonio A1 Dueñas, Carlos A1 Peñarrubia, María Jesús A1 Cuesta-Sancho, Sara A1 Montoya, María A1 Bernardo, David K1 Covid-19 (Enfermedad) K1 Inmunología K1 Computational cytometry K1 Vaccine failure K1 COVID-19 K1 Immunocompromised adult K1 2412 Inmunología AB Introduction: Coronavirus disease 2019 (COVID-19) affects the population unequally, with a greater impact on older and immunosuppressed people.Methods: Hence, we performed a prospective experimental cohort study to characterise the effect of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination in immune-compromised patients (older adults and oncohaematologic patients), compared with healthy counterparts, based on deep characterisation of the circulating immune cell subsets.Results and discussion: While acquired humoral and cellular memory did not predict subsequent infection 18 months after full vaccination, spectral and computational cytometry revealed several subsets within the CD8+ T-cells, B-cells, natural killer (NK) cells, monocytes and TEMRA Tγδ cells that were differentially expressed in individuals who were subsequently infected and not infected not just following immunisation, but also prior to vaccination. Of note, we found up to seven clusters within the TEMRA Tγδ cell population, with some of them being expanded and others decreased in subsequently infected individuals. Moreover, some of these cellular clusters were also related to COVID-19-induced hospitalisation in oncohaematologic patients. Therefore, we have identified a cellular signature that even before vaccination is related to COVID-19 vulnerability as opposed to the acquisition of cellular and/or humoral memory following vaccination with SARS-CoV-2 messenger RNA (mRNA) vaccines. PB Frontiers in Immunology SN 1664-3224 YR 2024 FD 2024 LK https://uvadoc.uva.es/handle/10324/76933 UL https://uvadoc.uva.es/handle/10324/76933 LA eng NO Frontiers in Immunology, November, 2024, Sec. Viral Immunology Volume 15 - 2024 | NO Producción Científica DS UVaDOC RD 03-ago-2025