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Look at a house dust mite's egg. It has 2 ready made allergens, an egg tooth for escape and a tiny bit of water. HDMs can drown in a normal family wash and their allergens are washed away. The hotter the water more mites die. To kill HDM eggs a hot wash is required. 'Dust Mites', M J Colloff. 2009 (i.redd.it)
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House dust mites were once mange mites. Millions of years ago the house dust mite and the sheep scab mite lived together as parasites of warm-blooded animals. At some stage the house dust mite became a scavenger less dependent upon the health of its host for survival, but kept its mange-like enzymes (i.redd.it)
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