S282: A RANDOMIZED CONTROLLED CLINICAL TRIAL DEMONSTRATES THAT PLASMA FROM CONVALESCENT AND VACCINATED DONORS IMPROVES OUTCOME OF COVID-19 IN PATIENTS WITH HEMATOLOGICAL DISEASE, CANCER OR IMMUNOSUPPRESSION. (23rd June 2022) - Müller-Tidow, C.; Janssen, M.; Schäkel, U.; Gall, J.; Leo, A.; Stelmach, P.; Krisam, J.; Baumann, L.; Stermann, J.; Merle, U.; Zeier, M.; Weigand, M. A.; et al.