Convalescent Plasma for the Treatment of Patients With Severe COVID-19 Infection

"Convalescent Plasma - early treatment of patients with severe COVID-19. Clinical and laboratory data of patients will be collected before initiation of the procedure, 30 minutes after the first dose, 30 minutes after the second dose and 30 minutes after the third plasma dose and then on days 1-7, 14, 21, 28, 35 from the start of treatment. In case of adverse reactions during transfusion such as acute shortness of breath, haemodynamic instability or high pre-existing and non-disease-related fever, the transfusion will be interrupted and detailed recording of the event as well as updating the Adverse Events Management Committee will be performed.~In addition to the standard assessments, the titer of neutralizing anti-SARS-CoV-2 antibodies will be measured in a sample drawn prior to plasmapheresis.~All donors will be tested for:~1. the titer of IgG anti-SARS-CoV-2 antibodies (Pasteur Institute)~2. the titer of neutralizing anti-SARS-CoV-2 antibodies (Pasteur Institute)"