A single dust mite produces about 20 waste droppings each day, each containing a protein to which many people are allergic. The proteins in the combination of feces and shed skin are what cause allergic reactions in humans.
Protozoa (dust mite allergy symptoms):
Bed bugs or Cimex lectularius, feed on humans and animal hosts, like birds and bats and have been around pretty much forever. They are called bed bugs because of their preferred habitat in human homes: sofas, bed mattresses, upholstered furniture, bad frames, cracks in walls and molding, clothing, ceiling holes for light fixtures, carpets, books, phones - they don't create a nest, they just hide somewhere.
Bed bugs are seen as a growing problem within all types of dwellings, including private homes, dormitories, cruise ships, trains, army barracks, hotels, etc. <read more Dr Luciano Schiazza>