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Changes in sIgA in feces and saliva compared with baseline. (a) fecal sIgA changes of all participants; (b) fecal sIgA changes of 6–12-month-old sub-group; (c) fecal sIgA changes of 13–24-month-old subgroup; (d) saliva sIgA changes of all participants; (e) saliva sIgA changes of 6–12-month-old sub-group; (f) saliva sIgA changes of 13–24-month-old subgroup.
