Fig. 3

sIgA targeting of nasal bacteria. A Alpha diversity of the non-sorted, sIgA-positive and sIgA-negative fractions, expressed as the Inverse Simpson index. Individual values are depicted in red, with the median and 95% confidence interval in black. Statistical differences were calculated by Kruskal–Wallis test with Dunn’s test for multiple comparisons. B, C sIgA targeting is presented as the IgA probability ratio on a scale from − 1 to + 1 for (B) the top-6 most prevalent genera and (C) the top 20 most prevalent species (also see Figure S3). Individual values are depicted as red dots, with the mean ± SEM in black. IgA scores were tested by Wilcoxon signed-rank test against a hypothetical value of 0