A new study of 185 COVID patients found that 90% of the subjects were still seropositive for neutralizing antibodies at the 6 to 8 month time points. B-cells specific to the Spike and to the nucleocapsid coronavirus proteins actually increased over a five-month period. Memory T cells appeared to have half-lives of at least five or six months in these patients, and helper T cells were completely stable over the entire period studied.https://www.biorxiv.org/content/10.1101/2020.11.15.383323v1
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