[Pathologichohistological skin changes in red-backed mice parasitized by larvae of the trombiculid mite, Neotromibcula pomeranzevi (Trombiculidae)].

During the feeding of N. pomeranzevi larvae on their natural hosgs, large-toothed redbacked voles (Clethronomys rufocanues Sandev.), in the skin of the latter are formed tubular structures or stylosomes characteristic of all trombiculids. During the formation of the stylosome the saliva of the mites and the interstitial fluid of the host are supposed to interact. The walls of the stylosome consist of two layers, are homogenous and do not include cellular elements. Around the stylosomes are formed the foci of necrosis and destruction of tissues. Behind the distal ends of the stylosomes are observed light interstitial cavities, which of then contain a great number of cellula relements of lymphoid and epithelioid nature. These cavities serve apparently as a reservoir of nutritive substratum for larvae. The feeding of trombiculids is accompanied by a reactive response of the connective tissue, the hyperemy of the superficial capillaries and the cellular infiltration of the affected area. The mass parasitism of larvae causes the ulceration of the host's skin and on its surface appear crusts from necrotic tissues.