SARS-CoV-2(25) COVID-19(22) Donor(20) convalescent plasma(20) Blood(15) material(15) plasma(13) blood donor(11) antibody(11) IgG(11) Blood donors(10) transfusion(10) titre(9) collected(9) Blood safety(9) vaccination(9) Infection(9) healthy(8) country(8) Characteristics(8) Seroprevalence(8) Immunoglobulin(8) IgM(7) Neutralizing(7) reduced(7) neutralizing antibody(7) convalescent(7) COVID-19 pandemic(7) Neutralizing activity(7) Abbott(6)