Fig. 2
From: Secretory IgA impacts the microbiota density in the human nose
Nasal sIgA concentration and correlation with bacterial density and diversity. A Distribution with the median ± interquartile range of nasal sIgA concentrations in the filtered nasal eluates of all study participants. B Sorting by FACS of a representative nasal microbial sample into sIgA-positive (green gate) and sIgA-negative (red gate) fractions, based on forward scatter (FSC-A) and anti-IgA-FITC staining. C, D Distribution with the median ± interquartile range of C nasal bacterial density, expressed as the total number of events analyzed by FACS, and D percentage of sIgA-positive events detected by FACS. E–G Correlation of the nasal sIgA concentration with (E) the percentage of sIgA-positive events detected by FACS, (F) the bacterial density expressed as the total number of FACS events, and (G) the alpha diversity expressed as the Inverse Simpson index in the non-sorted fraction. Correlations were tested by linear regression analysis