Serum levels of IgE, which is associated with allergic diseases, were significantly decreased in the FMT_8w group (1120.34 ± 66.16 ng/ml, p = 0.0025) but increased in the before_FMT group (1737.89 ± 103.84 ng/ml; Fig. 6a). The gene discussed is IGHE; the disease is allergic disease.