AKARIAZ (acariasis; Greek akari — a tick; a synonym of acarodermatitis) — group of the dermatosis caused by mites. K A. carry: a demodicosis (see), a mange (see), the erythema migrating Lipshyuttsa (see the Erythema) and a grain mange (a synonym: straw mange, matratsny mange, barley mange). K A. it is necessary to carry also the dermatitis resulting from stings of mites of Dermanyssus gallinae and Ornithonyssus bacoti. Believe that this dermatitis is caused by toxic effect of saliva of mites.
A grain mange is for the first time described by Shamberg (J. F. Schamberg, 1901). The activator — a big-bellied tick (Pediculoides ventricosus) living in grain, straw, cotton, in dust of flour bags, stale grain products and a container where they were stored. At the impregnated female of a tick the tail of a body becomes spherical (a big-bellied tick).
The clinical picture of grain itch is characterized by emergence on skin of a trunk and a neck of rashes in the form of the large blisters with bubbles and pustules on their surface reminding sometimes a mnogoformny exudative erythema. Owing to a severe itch and having combed quite often the piokokkovy infection joins and develops pyoderma (see) that can be followed by fever, an indisposition, weakness. In blood sometimes find a leukocytosis and an eosinophilia. It is necessary to differentiate a grain mange with a small tortoiseshell, at a cut usually do not observe vesicles and pustules, with chicken pox (see), with a mange (lack of the scabby courses, localization of urtikarny elements from vezikulopustula on a surface). Diagnosis is promoted by detection of a big-bellied tick in grain, straw, mattresses etc.
Treatment — heat baths with weak solution of potassium permanganate and hydrosodium carbonate, 5 — 10% Unguentums sulfuratum; the disease usually passes in 5 — 15 days.
Prevention — disinsection of grain warehouses, bags, holds and other objects where find ticks, to-ruyu carry usually out by sulfurizing, chloropicrin and vapors of formalin. Disinsection of chicken ectoparasites, e.g. Dermanyssus gallinae, with success carry out 0,5 — 1% by aqueous solutions of sevin and a hlorofos.
Bibliography: Mashkilleyson L. N. Infectious and parasitic diseases of skin, page 327, M., 1960; The Multivolume guide to a dermatovenereology, under the editorship of S. T. Pavlov, t. 2, page 444, L., 1961; Dermatologie und Venerologie, hrsg. v. H. A. Gottron u. W. Schonfeld, Bd 2, T. 2, S. 969, Stuttgart, 1958.
H. D. Sheklakov.