Less severe course of COVID-19 is associated with elevated levels of antibodies against seasonal human coronaviruses OC43 and HKU1 (HCoV OC43, HCoV HKU1) View ORCID ProfileMartin Dugas, Tanja Grote-Westrick, Richard Vollenberg, Eva Lorentzen, Tobias Brix, Hartmut Schmidt, Phil-Robin Tepasse, Joachim Kühn