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. 2023 Sep;63(9):1639-1648.
doi: 10.1111/trf.17485. Epub 2023 Aug 3.

Transfusion reactions associated with COVID-19 convalescent plasma in outpatient clinical trials

Affiliations

Transfusion reactions associated with COVID-19 convalescent plasma in outpatient clinical trials

Moises A Huaman et al. Transfusion. 2023 Sep.

Abstract

Background: COVID-19 convalescent plasma (CCP) is an important therapeutic option for outpatients at high risk of hospitalization from SARS-CoV-2 infection. We assessed the safety of outpatient CCP transfusions administered during clinical trials.

Study design and methods: We analyzed data pertaining to transfusion-related reactions from two randomized controlled trials in the U.S. that evaluated the efficacy of CCP versus control plasma in various ambulatory settings. Multivariable logistic regression was used to assess whether CCP was associated with transfusion reactions, after adjusting for potential confounders.

Results: The combined study reported 79/1351 (5.9%) adverse events during the transfusion visit, with the majority 62/1351 (4.6%) characterized by mild, allergic-type findings of urticaria, and/or pruritus consistent with minor allergic transfusion reactions; the other reported events were attributed to the patients' underlying disease, COVID-19, or vasovagal in nature. We found no difference in the likelihood of allergic transfusion reactions between those receiving CCP versus control plasma (adjusted odds ratio [AOR], 0.75; 95% CI, 0.43-1.31). Risk of urticaria and/or pruritus increased with a pre-existing diagnosis of asthma (AOR, 2.33; 95% CI, 1.16-4.67). We did not observe any CCP-attributed antibody disease enhancement in participants with COVID-19 or increased risk of infection. There were no life-threatening severe transfusion reactions and no patients required hospitalization related to transfusion-associated complications.

Discussion: Outpatient plasma administration was safely performed for nearly 1400 participants. CCP is a safe therapeutic option for outpatients at risk of hospitalization from COVID-19.

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Conflict of interest statement

Conflicts of interest

MAH: contracts from Gilead Sciences Inc, Insmed Inc, AN2 Therapeutics, Inc to the University of Cincinnati, outside the submitted work. TG- Paid consultant and employee of Fenwal, a Fresenius Kabi company; AC- Scientific Advisory Board of Sabtherapeutics (cow-derived human immunoglobulins COVID-19 treatment and other infectious diseases) and Ortho Diagnostics Speakers Bureau; EB- member of the FDA Blood Products Advisory Committee; SS reports research grants; F2G, Cidara, Ansun, Zeteo, Emergent Biosolutions: personal fees as consultant, speaker, advisory board, data safety monitoring board member; Celltrion, Adagio, Immunome, Adamis, Karyopharm, Intermountain Health, Karius, Avir Pharma; CGS: Centers for Disease Control and Prevention, Merck: Research Grants. All other authors report no relevant disclosures.

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