There is insufficient data on the involvement of Clostridiales Incertae Sedis XIII, Anaerovoracaceae, and Flavobacteriaceae in inflammation, including atopy; however, a decrease in the relative number of representatives of Clostridiales Incertae Sedis XIII and Flavobacteriaceae was observed in a Chinese study of IgE-mediated food allergy in infants [61]. This evidence concerns the gene IGHE and food allergy.