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Seropositivity of Abbott SARS-CoV-2 IgG immunoassay. A) Seropositivity in 1347 specimens from 427 patients with positive PCR results relative to days from symptom onset and B) relative to days from testing positive by PCR. Dotted line represents the cutoff for positivity (index value ≥1.4). Red line represents the median of antibody index value for each time period.
