Brief Research Report: Virus-Specific Humoral Immunity at Admission Predicts the Development of Respiratory Failure in Unvaccinated SARS-CoV-2 Patients oleh Ana Tajuelo, Octavio Carretero, Estéfani García-Ríos, Estéfani García-Ríos, Mireia López-Siles, Olga Cano, Mónica Vázquez, Vicente Más, Isabel Rodríguez-Goncer, Antonio Lalueza, Antonio Lalueza, Francisco López-Medrano, Francisco López-Medrano, Francisco López-Medrano, Rafael San Juan, Rafael San Juan, Rafael San Juan, Mario Fernández-Ruiz, Mario Fernández-Ruiz, Mario Fernández-Ruiz, José Mᵃ Aguado, José Mᵃ Aguado, José Mᵃ Aguado, Michael J. McConnell, Pilar Pérez-Romero