Abstract
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In this pediatric cohort, the Abbott SARS-CoV-2 IgM and IgG assays have negative agreements of 98.7-100% with NAAT.
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The Abbott SARS-CoV-2 IgM had the highest positive agreement with NAAT results 15-30 days after results and symptom onset.
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The Abbott SARS-Co-V-2 IgG had the highest positive agreement 31-60 days after results or 61-90 days after symptom onset.
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IgM started to decline 30 days after NAAT results and faded by 90 days after.
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IgG against the nucleocapsid protein started to decrease 60 days after results, but could still be detected months after.