【ScienceABC】Why Do Humans Have Allergies?

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When the winter snows begin to melt away, and the flowers begin to bloom, this reminds many people around the world of one thing… allergy season! Allergies come in many shapes and sizes, as do the symptoms of an allergic reaction, but there is still something oddly mysterious about this behavior of the body. While most allergies can easily be managed, the whole subject raises a very simple question – why do so many humans have allergies in the first place? The Science of Allergies When we are born, our bodies are essentially a blank canvas, meaning that our immune system is completely fresh, and untainted by the world around us. Our first exposure to any potential pollutants, irritants, bacteria or viruses usually comes as we exit the womb. That is the first time that our immune system must kick into action. This early exposure to parasites, microbes and other unwanted ………………………………