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Understanding Ticks and Mites: Skin Parasites and Their Life Cycles

Ticks and mites are skin parasites that feed by creating wounds in the dermis for blood flow. They attach to skin with barbed mouthparts and adhesive cement, affecting blood capillaries. Different mites like Psoroptic and Sarcoptic have distinct locations on or in the skin. Learn about the life cycles of these parasites and how they infest hosts.

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Understanding Ticks and Mites: Skin Parasites and Their Life Cycles

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  1. tick body palps cement blood pool dermis TICKS & MITES / PARASITES LOCATION OF TICKS IN SKIN Ticks feed by creating a wound in the dermis into which blood flows. The ticks attach to skin with barbed mouthparts and an adhesive (cement) secreted in the saliva. epidermis capillaries (papillary loops)

  2. epidermis dermis epidermis dermis TICK, MITE PARASITES LOCATION OF MITES ON OR IN SKIN (1) Psoroptic mites (Psoroptes, Chorioptes, Otedectes etc) ON epidermis Sarcoptic mites (Sarcoptes, Knemidocoptes, Notoedres) IN epidermis

  3. epidermis dermis epidermis dermis TICK, MITE PARASITE LOCATION OF MITES ON OR IN SKIN (2) hair shaft Demodectic mites (Demodex) External to epidermis, but within skin Dermanyssid & trombiculid mites (Dermanyssus, Trombicula) External to epidermis, direct penetration to capillaries

  4. fomites egg larva nymph adult egg (almost entirely on host) TICKS, MITES PARASITES LIFE CYCLE OF PSOROPTES infested flock transported sheep uninfested flock

  5. egg larva nymph adult larva only is parasitic nymph and adult predatory on insects TICK, MITE PARASITES LIFE CYCLE OF TROMBICULA

  6. TICK, MITE PARASITESLIFE CYCLE OF DERMANYSSUS egg larva Ist nymph 2nd nymph adult all stages feed on birds

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