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Estimated combined immunoglobulin G (IgG) to the nucleocapsid protein (IgG N) and the spike protein (IgG S) prevalence in the hospital system and the community based on asymptomatic patients after February 15, 2021. The error bars represent ±1 SD of uncertainty. The positions of the months on the x-axis correspond to the week of data containing the first of that month.
