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Quantitative SARS-CoV-2 spike IgG antibody levels in patients with (CoV-positive; N = 81) and without (CoV-negative; N = 94) prior SARS-CoV-2 infection after one dose of BNT162b2 (Pfizer/BioNtech) mRNA vaccine. Median titres (horizontal lines) of anti-S IgG were compared between CoV-positive and CoV-negative patients using a Mann-Whitney-U test.
