IGHE and peanut allergic reaction: However, stratifying according to the type of FA, we found a significant correlation between high total IgE and the abundance of the genus Collinsella in the feces and elbow samples of patients with tree nut and/or peanut allergy, but not in forearm samples (feces p = 0.001, elbow = 0.0418, forearm = 0.1296) (Supplementary Figure S6).