(1)Those who are pregnant or breastfeeding(2)Those whose religious beliefs do not support the administration of blood transfusions.(3)Those who are participating in an interventional study that provides therapeutic intervention for COVID-19.(4)Those who have been vaccinated against SARS-CoV-2.(5)Patients who have already received convalescent plasma.(6)Those with a history of allergy to blood products.(7)Patients with plasma protein deficiency such as IgA(8)Patients with NYHA class III or IV heart failure(9)Others who are judged inappropriate for inclusion in the study by the principal investigator, principal investigator, or sub-investigator.

(1)Those who are pregnant or breastfeeding(2)Those whose religious beliefs do not support the administration of blood transfusions.(3)Those who are participating in an interventional study that provides therapeutic intervention for COVID-19.(4)Those who have been vaccinated against SARS-CoV-2.(5)Patients who have already received convalescent plasma.(6)Those with a history of allergy to blood products.(7)Patients with plasma protein deficiency such as IgA(8)Patients with NYHA class III or IV heart failure(9)Others who are judged inappropriate for inclusion in the study by the principal investigator, principal investigator, or sub-investigator.