Efficacy of Reinforcing Standard Therapy in COVID-19 Patients With Repeated Transfusion of Convalescent Plasma

"Convalescent plasma plus standard treatment for COVID-19. The convalescent plasma is from patients recovered from COVID-19 and negative viremia in the test detection COVID-19.~The infusions will be given on days 1 and 2, of the study, after the positive result for COVID-19 of the recipient patient."

The patients will receive the standard treatment for COVID-19, according to guidelines for COVID-19 (retrovirals drugs, interferon-α / β, anti-Interleukin-6 monoclonal antibody, oxygen therapy, etc..)