Trombidium muscae domesticae
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Tromb. is a parasite found singly or in groups upon the common house-fly of a bright red color, nearly circular in shape. The alcoholic tincture, a brilliant orange in color was prepared from specimens, about 115 in number, collected in Frankfort, Philadelphia in 1864. The provings, under the supervision of Hering (on 4 persons), were made with the 3x, 6x, 9c, 18c. and 30c potencies. Tromb. has cured dysentery with brown, thin, bloody stools and tenesmus.
The "parasite found singly or in groups upon the common housefly, of a bright red colour, nearly circular in shape," is a mite with the scientific name of Trombidium. Like spiders and scorpions, mites belong to the genus of Arachnids. The approx. 20,000 species of mites are regularly joined by newly-discovered species. The small, often microscopically small, spidery creatures have a long fossil history going back almost 300 million years. Almost all species have three pairs of legs in the larva stage and four pairs in the later development stages and when adult. Prior to adulthood, the mite goes through four to five growth stages. Some species cause a lot of damage to agriculture and human health, but most are harmless and sometimes even useful to humans. Too small to see with the naked eye, the number of individuals per hectare of grassland or forest can amount to several million. Mites are an outstanding example of land animals and have succeeded in colonising the soil all over the world, even as far as the South Pole. Many species are predators of other mites and of insects, and play an important role in restricting populations of harmful organisms. For example, there is a species of a medium-sized brown mite which is abundant in manure and compost, where it lives on the eggs and larvae of houseflies. If this mite were suppressed in places where houseflies reproduce, the population of houseflies would explode. The majority of land mites, however, feed on waste products. One of the largest and generally most feared of these classes is the tick, which feeds on the blood of reptiles, birds and mammals and can grow to a length of 3 centimetres. In doing this, some ticks transmit harmful organisms. A good example is Ixodes dammini, a hard tick that transmits a spirochete, thereby causing Lyme disease. Another class, in this case seldom longer than 1 millimetre, includes species that can serious affect stored products such as cheese, grain, dried fruit and the like. This genus includes the itch-mite, which causes scabies, a disease on which the remedy picture of Psorinum is based.
The class to which Trombidium belongs includes species that feed on plants, such as the notorious red spider mite, or that live as parasites on bees, wasps, flies and ants. Houseflies can carry with them large populations of mites and their bright red larvae. The larvae can also choose humans as hosts. They climb up the leg and bite into the skin to attach themselves, thereby causing intense itch. The house-dust mite is a related species which causes allergic reactions in humans.
Trombidium should be studied more with relation to the tendency of mites to cause skin complaints ["skin symptoms were prominent"] and allergies.