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Sarcoptes scabiei

Sarcoptes scabiei. Taxonomic classification. Class Arachnida Sarcoptes scabiei (sarcoptic mange mite, itch mite) . Host spectrum. Domestic (sheep, goats, cattle, pigs, equids, dogs , rabbits) and wild animals, humans, other primates

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Sarcoptes scabiei

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  1. Sarcoptes scabiei

  2. Taxonomic classification • Class Arachnida • Sarcoptes scabiei (sarcoptic mange mite, itch mite)

  3. Host spectrum • Domestic (sheep, goats, cattle, pigs, equids, dogs , rabbits) and wild animals, humans, other primates • Each host is considered to have its own strain or variety, e.g. Sarcoptes scabiei var. equi and Sarcoptes scabiei var. hominis

  4. Geographic distribution • Probably worldwide

  5. Morphology • Adults - rounded body; females 0.33-0.6 mm long and 0.25-0.4 mm wide, males 0.2-0.24 mm long, 0.15-0.2 mm wide; 8 short legs, posterior 2 pairs do not extend beyond the body margin; unsegmented pedicels; mouthparts have a rounded appearance.

  6. Sarcoptes scabiei, the scabies or itch mite

  7. Life cycle (stages) • Female mites tunnel into the epidermis , lay 3-5 eggs per day for a total of 40-50 eggs • Six-legged larvae hatch from eggs • Larvae and nymphs (proto- and deuto-) burrow into the stratum corneum and form pockets where they molt and feed • Adult males and females develop and mate • Life cycle requires 2-3 weeks to complete

  8. Site of infestation • Skin (epidermis); females, eggs, larvae and nymphs in tunnels or pockets, males on the skin surface.

  9. Pathogenesis/clinical signs • Initial lesions occur on the hand, elbows, axillary or inguinal regions • Lesions are initially erythematous, then become papular; papules rupture and skin becomes crusty • Alopecia, thickening of the skin, pruritus • Secondary bacterial infection, allergic reaction, self-mutilation may occur

  10. A severe case of scabies of the hand. 

  11. Crusted appearance on hands

  12. Treatment Lindane shampoo or dip, phosmet (ParamiteR), or Amitraz (MitabanR) • ivermectin weekly for four weeks orally or subcutaneously

  13. Public health significance • Humans may be infested with the strains from animals and these infestations may be mild to intensely pruritic, but they are self-limiting.

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