Sarcoptes scabiei var hominis (Scabies) is a topic covered in the Johns Hopkins ABX Guide.

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MICROBIOLOGY

  • Sarcoptes scabiei: a mite (an ectoparasite)
    • Usual taxonomy divides mite based on host origin
    • Recent data suggest mites are distributed into 3 genetically distinct clades, with most mites in the B and C clades; and therefore, all human scabies is not caused by a homogeneous population. It is currently unknown if different clades are associated with differential gene expression.
  • Mites burrow into the stratum corneum and lay their eggs; new mites hatch and form new burrows.
    • Scabies can be a major initiating factor in streptococcal pyoderma and linked to post-streptococcal sequelae such as acute rheumatic fever and acute post-streptococcal glomerulonephritis.

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Last updated: April 5, 2017