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. 2022 Jun 13;17(6):e0269885. doi: 10.1371/journal.pone.0269885

Fig 1. Anti-spike IgG antibody responses.

Fig 1

Anti-SARS-CoV-2 IgG levels were determined in individuals without or with evidence of prior infection. Participants were not vaccinated (UnVac) or received at least one dose of a vaccine against SARS-CoV-2 (Vac). The number of participants (n) in each group is shown in parentheses. Statistical significance was determined using the Kruskal Wallis test followed by Dunn’s multiple comparisons test. Horizontal bars indicate median values. Statistically significant differences are indicated with asterisks: ****p<0.0001. Dotted line: positive cut-off value.