Fig 2. Levels of IgG against SARS-CoV-2 in individuals without evidence of prior infection.

Participants received either one or two doses of a licensed vaccine. A) There were no significant differences in IgG in the three age groups. B) IgG levels according to vaccine type and the number of doses. Kruskal Wallis test followed by Dunn’s multiple comparisons test was used for statistical analysis. Statistically significant differences are indicated with asterisks: *p<0.05, ****p<0.0001, ns: non-significant. Horizontal bars indicate median values. Dotted lines: positive cut-off values.