a-c, Relative abundance of sequences assigned by QIIME to the bacterial genus Sutterella from 16S rDNA analysis in (a) Facility 1 and (b) Facility 2. These results are summarized in (c). One-way ANOVA: F=12.85, P<0.0001. n=13(Facility 1 IgA- High), n=14(Facility 1 IgA-Low), n=73(Facility 2 IgA-High), and n=68(Facility 2 IgA-Low) samples. Values in (c) are indicated as mean±s.e.m. Means with different letters are significantly different by Tukey's multiple comparison test.