What are the signs, symptoms and what to do next?
Types of cow’s milk allergy
There are two types of cow’s milk allergy depending on how the immune system reacts. Symptoms that are ‘immediate’ (quick to appear) are caused by the immunoglobulin E antibody (called IgE). Typically these allergic symptoms happen within minutes of consuming cow’s milk or up to two hours afterwards. This type of reaction is described as IgE mediated food allergy.
The other type of milk allergy happens when symptoms are ‘delayed’ (slow to appear) and are caused by a different part of the immune system reacting in a different way. This type of reaction is described as Non-IgE mediated food allergy and is the most common type. The symptoms typically develop from two hours after consumption but can take up to 72 hours. If cow’s milk continues to be consumed in the diet, the immune system will continue to produce such symptoms over days or even weeks.