ABSTRACT
IntroductionThe efficacy of SARS-CoV2 standard single donor convalescent plasma varied according to the application time and most importantly the amount of antibody that is administered. Single donor plasma has some drawbacks; such as the insufficient levels of neutralizing antibody activities, the requirements of blood group compatibility, and the risk of infection transmission. In this study, the efficacy and safety of pathogen inactivated, isohemagglutinin-depleted (concentrated) and pooled convalescent plasma was investigated. MethodsIn this study, ACB-IP 1.0 convalescent plasma product was prepared as follows; first, convalescent plasma was collected from different donors, then pathogen-inactivation was carried-out, and isohemagglutinins were cryodepleted, respectively. Finally, concentrated convalescent plasma product was pooled and stored until use. A total of sixteen patients were treated with two different convalescent plasma products. Nine patients were treated with standard single donor convalescent plasma and seven were treated with pathogen-free, concentrated, pooled convalescent plasma (ACB-IP 1.0) between 01 March 2020 and 31 December 2020. The outcomes of these two plasma products were compared regarding SARS-CoV2 antibody titers, neutralizing antibody activities, length of hospitalization and mortality rates. ResultsFive out of six single donor plasma SARS-CoV2 antibody titers remained below 12 s/co, but the antibody titers of all ACB-IP 1.0 plasma were above 12 s/co. SARS-CoV2 total antibody titers of ACB-IP 1.0 plasma were statistically higher than the antibody titers of single donor plasma. Mean total plasma neutralizing antibody activity of ACB-IP 1.0 plasma (1.5421) was found statistically higher than single donor plasma (0.9642) in 1:256 dilution ({rho}=0.0087) The mortality rate of the patients treated with ACB-IP 1.0 plasma showed statistically lower (p: 0,033) than the patients treated with single donor plasma. The administration of either single donor plasma or ACB-IP 1.0 plasma to the patients within eight days significantly shortened the length of hospitalization compared to administration of either plasma to the patients later than eight days ({rho}= 0,0021) DiscussionPathogen-free, concentrated, pooled convalescent plasma may resolve the bias in SARS-CoV2 antibody titers and neutralizing antibody activities, without requiring blood group compatibility that allows patient accessibility in a shorter time and has safe plasma characteristic. This study indicates that ACB-IP 1.0 may be a superior product compared to standard single donor plasma.
