The prevalence of Bacteroides was found to be greater in children diagnosed with IgE-mediated Cow’s milk allergy (CMA) in comparison to individuals with non-IgE-mediated CMA and healthy individuals. Bacteroides may play a significant role in the development of CMA and suggests the existence of shared mechanisms that contribute to both non-IgE- and IgE-mediated food allergies. This evidence concerns the gene IGHE and food allergy.