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Mucosal antibody responses against wild-type SARS-CoV-2 (WT) and omicron subvariants induced by XBB.1.5 mRNA vaccines. (a) Saliva levels of anti-RBD IgG before (pre) and two to four weeks after (post) vaccination. (b) Saliva levels of anti-RBD IgA before (pre) and two to four weeks after (post) vaccination. Statistical analyses are based on exact Wilcoxon signed-rank tests.
