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Scabies (/ ˈ s k eɪ b iː z, ˈ s k eɪ b i iː z /; [10] also sometimes known as the seven-year itch) [1] is a contagious human skin infestation by the tiny (0.2–0.45 mm) mite Sarcoptes scabiei, [1] [3] variety hominis. The word is from Latin: scabere, lit. 'to scratch'. [11] The most common symptoms are severe itchiness and a pimple-like ...
The scabies mite Sarcoptes scabiei var. hominis goes through four stages in its lifecycle: egg, larva, nymph, and adult. Upon infesting a human host, the adult female burrows into the stratum corneum (outermost layer of skin), where she deposits two or three eggs per day. These oval eggs are 0.1–0.15 mm (0.0039–0.0059 in) long and hatch as ...
The theory gained much support, as it was known to be more common on light gritty soils. In 1890 however, Roland Thaxter isolated a microbe that could cause common scab lesions, naming it Oospora scabies. [4] Over the years, this species was renamed several times, now being known as Streptomyces scabies. [5]
Pyriproxyfen is a pesticide which is found to be effective against a variety of insects. [3] It was introduced to the US in 1996, to protect cotton crops against whitefly.It has also been found useful for protecting other crops. [4]
Benzyl benzoate is an effective and inexpensive topical treatment for human scabies. [7] It has vasodilating and spasmolytic effects and is present in many asthma and whooping cough drugs. [ 8 ] It is also used as an excipient in some testosterone -replacement medications (like Nebido ) for treating hypogonadism .
Streptomyces scabiei (also wrongly named Streptomyces scabies) [1] is a streptomycete bacterium species found in soils around the world. [2] Unlike most of the 500 or so Streptomyces species it is a plant pathogen causing corky lesions to form on tuber and root crops as well as decreasing the growth of seedlings.
In the Second World War, he studied the control of scabies mite, an infection that was keeping thousands of soldiers in hospital. Mellanby meticulously counted all female mites that had burrowed into 886 soldiers, and determined that the average scabies sufferer harbors only 11.3 mites.
Mites which colonize human skin are the cause of several types of itchy skin rashes, such as gamasoidosis, [51] rodent mite dermatitis, [52] grain itch, [53] grocer's itch, [53] and scabies; Sarcoptes scabiei is a parasitic mite responsible for scabies, which is one of the three most common skin disorders in children. [54]