Trial With or Without Infusion of SARS-CoV-2 Antibody Containing Plasma in High-Risk Patients With COVID-19

The aim of this randomized phase-II study is to gain evidence on the effect of convalescent plasma/vaccine-boosted plasma in the treatment of SARS-CoV-2 infection in high-risk patients. High-risk is defined as SARS-CoV-2 positive infection with Oxygen saturation at ≤ 94% at ambient air with additional risk features as categorized in 4 groups: * group 1, pre-existing or concurrent hematological malignancy and/or active cancer therapy (incl. chemotherapy, radiotherapy, surgery) within the last 24 months or less. * group 2, chronic immunosuppression not meeting the criteria of group 1 * group 3, age ≥ 50 - 75 years meeting neither the criteria of group 1 nor group 2 and at least one of these criteria: Lymphopenia \< 0.8 x G/l and/or D-dimer \> 1μg/mL * group 4, age ≥ 75 years meeting neither the criteria of group 1 nor group 2 The duration of the trial for each patient is expected to be about 3 months, including two days of intervention (infusion of CP/PVP), followed by a follow-up of 3 months. Furthermore viral load is measured in nasopharagyngeal swabs at day 1, 3, 5, 10, 14, 28 or until hospital discharge within 84 days after randomization. Treatment response is assessed daily until day 28, thereafter weekly until day 56, and finally at day 84. Patients randomized into the standard arm of the study have the possibility to cross over into the experimental arm of the study starting at day 10 (+ 2 days) in case of not improving or worsening clinical condition. In total 174 patients are planned to be enrolled in the study.