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Seropositivity of Abbott semi-quantitative SARS-CoV-2 IgG immunoassay. A) Seropositivity in 1257 specimens from 402 patients with positive PCR results relative to days from symptom onset and B) relative to days from testing positive by PCR. Red line represents the median antibody concentration for each time period. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
