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harmless, such as pollen , molds , animal proteins , dust mites, insect poisons, and foods. symptoms may include sneezing, skin rashes, difficulty breathing, itching, watery eyes, and so forth. an allergen is a substance that triggers an allergic reaction. the immune system is the system of specialized cells
and organs that protects an organism from outside biological influences. when the immune system is functioning properly, it protects the body against foreign bacteria and viral infections and destroys cancer cells and foreign substances. when someone is experiencing an allergy, the complex coordination...
https://www.newworldencyclopedia.org/entry/Allergy