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. 2022 Feb 16;503:113243. doi: 10.1016/j.jim.2022.113243

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Fig. 2 — Clinical specificity of the Abbott AdviseDx SARS-CoV-2 IgG II assays. 305 pre-COVID-19 serum specimens were collected from healthy individuals between 2010 and 2015. PCR(−) specimens were from patients presenting to the hospital with symptoms of respiratory infection and negative for COVID-19 by PCR.