Scabies are caused from a mite called Sarcoptes scabiei. It is a contagious skin condition which is transmitted mainly through skin to skin contact. They can also be transferred from infected clothing or bedding. They can only survive three days without a human host. The mites secrete enzymes to dissolve the epidermal layer in order to penetrate the skin. The mites feed on the skin and burrow further to lay eggs.
Scabie mite life cycle
Immune response to scabies
The scabie mite has genes which prevent the immune system from responding to the presence of mites within the skin generally until days or weeks after the infection. When the scabie mite burrows, lays eggs and excretes faeces an allergic reaction will occur. Once infected the life cycle of the mites will continue unless medical treatment is sought.
Signs and symptoms
There are two common ways to diagnose the presence of scabies, a skin scrapping and using a felt tip marker.
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- topical medication 5% permethrine cream
- anti-parasitic medication
- itching can be treated with antihistamines
- Vacuuming home
- Cleaning linen and clothes
- Bagging non washable items for 5 days
- Finger nails cut and cleaned thoroughly and regularly
Secondary infection may occur from scratching the skin leading to a bacterial infection.
CDC Scabies Info: http://www.dpd.cdc.gov/dpdx/HTML/Scabies.htm
Epidemiology of Scabies: http://epirev.oxfordjournals.org/cgi/reprint/11/1/126
Winters, L. (2009). Scabies. Retrieved March 2, 2017, from https://web.stanford.edu/group/parasites/ParaSites2009/LeighaWinters_Scabies/LeighaWinters_Scabies.htm