Immune Determinants of Viral Clearance in Hospitalised COVID-19 Patients: Reduced Circulating Naïve CD4+ T Cell Counts Correspond with Delayed Viral Clearance 由 Mihaela Zlei, Igor A. Sidorov, Simone A. Joosten, Mirjam H. M. Heemskerk, Sebenzile K. Myeni, Cilia R. Pothast, Caroline S. de Brouwer, A. Linda Boomaars-van der Zanden, Krista E. van Meijgaarden, Shessy T. Morales, Els Wessels, Jacqueline J. Janse, Jelle J. Goeman, Christa M. Cobbaert, Aloys C. M. Kroes, Suzanne C. Cannegieter, Meta Roestenberg, Leonardus G. Visser, Marjolein Kikkert, Mariet C. W. Feltkamp, Sesmu M. Arbous, Frank J. T. Staal, Tom H. M. Ottenhoff, Jacques J. M. van Dongen, Anna H. E. Roukens, Jutte J. C. de Vries, in collaboration with BEAT-COVID, in collaboration with LUMC COVID