Abstract
We compared the ability of SARS-CoV2 Spike-specific antibodies to induce natural killer (NK) cell-mediated antibody dependent cellular cytotoxicity (ADCC) in patients with natural infection and vaccinated persons. Analyzing plasma samples from 39 COVID-19 patients and 11 vaccinated individuals, significant induction of ADCC could be observed over a period of more than three months in both vaccinated and recovered individuals. Although plasma antibody concentrations were lower in recovered patients, we found antibodies elicited by natural infection induced a significantly stronger ADCC response compared to those induced by vaccination, which may affect protection conferred by vaccination.
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