Pathogenesis associated with hair follicle mites (Demodex spp.) in Australian Aborigines

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Abstract
Dermodex folliculorum and D. brevis are found in different habitats in the skin, the former in the hair follicles, the latter in the sebaceous glands. Both seem minor pathogens, merely harvesting the cells of their respective habitats. D. folliculorum was found aggregated (all stages) and plugging the follicular orifices; D. brevis was usually solitary. In 1 case marked degeneration of the sebaceous gland, with leukocyte invasion, was associated with D. brevis. No correlations were discovered between these species and the gross condition of the skin. Positive samples were obtained from Australian mainland and island populations of Aborigines. Incidences were 66.6% for males and 80% for females; in the latter, the sample was small (5) and their ages > 34 yr.

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