The absence of immunoreactivity to donkey’s milk in patients with recurrent aphthous ulcers and immunoreactivity to cow’s milk

Despite the numerous benefits of milk constituents for human health a considerable number of the general population follow a milk-restricted diet due to clinically confirmed or self-assessed adverse reactions to cow’s milk consumption. Recurrent aphthous ulcers (RAU) are currently one of the most common oral disorders, with a worldwide distribution and insufficiently defined etiology, which, among other factors, implies the immunological reaction to food proteins. The aim of this study was to determine the immune-reactivity to donkey’s milk proteins in patients with RAU and compare it to the reactivity towards the proteins from cow’s and goat’s milks, in a set of simultaneous experiments. Levels of serum IgA, IgG and IgE antibodies to the same quantity of the examined antigens were determined by enzyme-linked immunosorbent assay. The results indicate that patients with RAU with increased immunity to cow’s milk proteins could consider the use of donkey’s milk as the best protein source