N-Protein IgG levels 6 weeks after the first BNT162b2 jab
N-protein IgG were detectable (≥ 0.8 signal to cutoff ratio) in 42
(5.7%) of the 735 negative RT-PCR residents. These residents were then
considered as immunised against SARS-CoV-2. Residents with an older
infection were less frequently seropositive for N-protein IgG than
residents with a newer infection (61.1% vs 83.7%, p<.001)
(Table 1). The N-protein IgG median level was lower in residents with an
older infection than in those with a newer infection
(p<0.001).