Origin of dust mites

Abstract

Dramatic increasing of the prevalence of hypersensitivity in the world population has been observed over the last half a century.The skin reactions in around 80% of the patients were tested positive with mite extracts.The impairment of health by this disease covers whole humans,due to 15%-17% of the population are atopic genetically.Inhabitation of the mites in the house dust popularly was exerted by human beings in the daily life activities themselves.Two modes of the invasion of the mites into houses can be achieved:either the phoretic colonization of the free living storage mites or the transit of the nest dwellers of synanthroptic animals into house dust breeders.Most of the stable house dust breeding mites are pyroglyphids.Results of the nuclear gene analysis indicate that pyroglyphids are belonging to Psoroptidian which primarily is the mammalian parasitic mites evolved from the free living Astigmata.The house dust mites Dermatophagoidinae are originated from a parasitic ancestor within the core of Psoroptidia,there were at least two shifts from presumably avian to mammalian hosts,and at last as the nest commensals of animals. Key words: Acari; House dust mite; Storage dust mite; Pyroglyphidae; Psoroptidia; Dust mite allergy; Origin