학술논문
Neutralizing Antibody Responses in COVID-19 Convalescent Sera.
Document Type
Journal Article
Author
Lee, William T; Girardin, Roxanne C; Dupuis, Alan P; Kulas, Karen E; Payne, Anne F; Wong, Susan J; Arinsburg, Suzanne; Nguyen, Freddy T; Mendu, Damodara Rao; Firpo-Betancourt, Adolfo; Jhang, Jeffrey; Wajnberg, Ania; Krammer, Florian; Cordon-Cardo, Carlos; Amler, Sherlita; Montecalvo, Marisa; Hutton, Brad; Taylor, Jill; McDonough, Kathleen A
Source
Subject
*CONVALESCENT plasma
*COVID-19
*ANTIBODY formation
*ENZYME-linked immunosorbent assay
*SARS-CoV-2
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Language
ISSN
0022-1899
Abstract
Passive transfer of antibodies from COVID-19 convalescent patients is being used as an experimental treatment for eligible patients with SARS-CoV-2 infections. The United States Food and Drug Administration's (FDA) guidelines for convalescent plasma initially recommended target antibody titers of 160. We evaluated SARS-CoV-2 neutralizing antibodies in sera from recovered COVID-19 patients using plaque reduction neutralization tests (PRNT) at moderate (PRNT50) and high (PRNT90) stringency thresholds. We found that neutralizing activity significantly increased with time post symptom onset (PSO), reaching a peak at 31-35 days PSO. At this point, the number of sera having neutralizing titers of at least 160 was approximately 93% (PRNT50) and approximately 54% (PRNT90). Sera with high SARS-CoV-2 antibody levels (>960 enzyme-linked immunosorbent assay titers) showed maximal activity, but not all high-titer sera contained neutralizing antibody at FDA recommended levels, particularly at high stringency. These results underscore the value of serum characterization for neutralization activity. [ABSTRACT FROM AUTHOR]