For most people, while disgusting, dust mites are not harmful. However, their microscopic cast skins and waste can induce allergic reactions in individuals who were previously not allergic to dust mites. A typical mattress can contain tens of thousands of dust mites; one square yard of bedroom carpet can contain over 100,000. And studies have shown that up to 10% of the weight of a two-year old pillow can be composed of dead mites and their waste. Sick yet?

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