Definition: The term "allergens" in Greek was originally used to describe the substances that are thought to trigger allergic reactions, primarily to pollen, dust, animal dander, mold spores, and other irritants. However, as this concept has evolved over time, its precise definition has changed. In 19th century medicine, when allergies were considered a health condition rather than an individual's ability to respond to specific allergens, the term "allergen" was used. This was not until the 20th century that it became clear that allergic reactions are due to immune cells reacting to these substances as they enter the body, leading to symptoms like itching, sneezing, and watery eyes. The modern definition of "allergens" is based on a study in 1987 by Peter J. Lister Jr. which concluded that allergens could be defined as any substance that stimulates an immune response to produce an allergic reaction. An allergen may also be defined as the part of a material, such as pollen or dust, which stimulates an immune system to react against it, causing an allergic reaction. In other words, if you eat a piece of chicken (the food) and then ingest dust from your home (the substance), you might develop allergies. So, in summary, "allergens" refers to substances that are thought to trigger the body's response to allergens like pollen, dust, animal dander, mold spores, or other irritants.

allergens