Long-term specific IgG response to SARS-CoV-2 nucleocapsid protein in recovered COVID-19 patients.

The median IgG S/C index at 3 months tended to be higher in the pneumonia group than in the non-pneumonia/asymptomatic group (5.7 [IQR: 3.9–6.6] vs 4.5 [IQR: 2.7–6.1]), although the difference did not reach statistical significance (Fig. 3 ).

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