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Type IV hypersensitivity, in the Gell and Coombs classification of allergic reactions, often called delayed-type hypersensitivity, is a type of hypersensitivity reaction that can take a day or more to develop. [1] Unlike the other types, it is not humoral (not antibody-mediated) but rather is a type of cell-mediated response.
A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure.
Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy. Food hypersensitivity is used to refer broadly to both food intolerances and food allergies.
Type IV reactions are further subdivided into type IVa, IVb, IVc, and IVd based on the type of T cell (Th1, Th17, and CTLs) involved and the cytokines/chemokines produced. [9] Delayed hypersensitivity plays a crucial role in our body's ability to fight various intracellular pathogens such as mycobacteria and fungi.
Alex Visker, 19, is allergic to all food. More specifically, he's allergic to the proteins that food contains. After even just a bite, he knows he would get hives, fatigue, extreme nausea, and a ...
After the delayed onset, the allergic response is like most food allergies, and especially an IgE-mediated allergy, including severe whole-body itching, hives, angioedema, gastrointestinal upset, and possible anaphylaxis. [2] [16] Anaphylactic reactions are seen in approximately 60% of afflicted individuals. [3]