A deficient immune response to SARS-CoV-2 in the nasopharynx is associated with severe COVID-19 pneumonia oleh Carlos Pita-Martínez, Felipe Pérez-García, Ana Virseda Berdices, María Martin-Vicente, Lucía Castilla-García, Irene Hervás Fernández, Victoria González Ventosa, María José Muñoz-Gómez, Juan Cuadros-González, Jesús F Bermejo-Martin, Salvador Resino, Isidoro Martínez