Fig. 7

Comparison of alpha diversities (the number of ASVs) in dust and nasopharyngeal samples. The paired boxplots show (A) 22 indoor dust samples from households and the paired nasopharyngeal swabs collected in the morning and (B) 21 indoor dust samples from workplaces and paired nasopharyngeal swabs collected in the afternoon (i.e., after an 8 h exposure to workplace environment). Differences between matrices were tested using the Wilcoxon signed-rank test (p < 0.001). One nasopharyngeal sample collected in the afternoon was excluded from the analysis