There appeared to be a decreasing trend in N antigen concentration over increasing Euroimmun anti-S1 IgG test result ( Fig. 1 c), but no such trend was observed over increasing Abbott anti-N IgG test result ( Fig. 1 d), nor the increasing MNT titer ( Fig. 1 e).
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Detection of SARS-CoV-2 nucleocapsid antigen from serum can aid in timing of COVID-19 infection.
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