Scabies mite
This presentation is the property of its rightful owner.
Sponsored Links
1 / 17

Scabies mite PowerPoint PPT Presentation


  • 425 Views
  • Uploaded on
  • Presentation posted in: General

Scabies mite. By : Amal Mohamed and Sahro Elmi. Introduction . Scabies is a contagious ectoparasite skin condition caused by the mite Sarcoptes scabiei. It effects people of all classes and ethnicities all over the world.  It is also known as the human itch mite or the scabies itch mite.

Download Presentation

Scabies mite

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Scabies mite

Scabies mite

By : Amal Mohamed and Sahro Elmi


Introduction

Introduction

  • Scabies is a contagious ectoparasite skin condition caused by the mite Sarcoptes scabiei.

  • It effects people of all classes and ethnicities all over the world. 

  • It is also known as the human itch mite or the scabies itch mite.

  • More than 300 million cases occur worldwide every year


History

History:

  • Scabies is an ancient affliction, estimated to have infected humans for the last 2,500 years. 

  • The first recorded reference to scabies is believed to be from the Bible.

  • The Roman philosopher Aristotle reported on “lice” that would “escape from little pimples if they are pricked” in the fourth century BCE scholars believe this was actually a reference to scabies. The Roman physician Celsus who is credited with designating the term “scabies” to the disease and describing its characteristic features.


Taxonomy

Taxonomy

  • Kingdom- Animalia

  • Phylum- Arthropoda

  • Class- Arachnida

  • Order- Acarina

  • Family- Sarcoptidae

  • Genus- Sarcoptes

  • Species- scabiei


Scabies mite

Host

  • Definitive Host: Humans (host specific)

  • Intermediate Host: none

  • Dogs and cats are infected by different types of mites. Scabies that affects dogs are called mange.


Morphology

Morphology

Egg: Oval ,0.10 to 0.15mm

Larvae : 3 legs and lasts 3 to 4 days

Nymph: 4 legs

Adult: round, sack-like eyeless mite, Female (0.30 to 0.45mm long and 0.25 to 0.35 mm wide) and Males are half the size of the females. Malting takes once and female are fertile for the rest of her life(1-2 months)


Life cycle

Life cycle


The life cycle in words

The life cycle in words

  • Female deposit 2-3 eggs per day burrow under skin. After the eggs hatch, the larvae migrate to the skin surface and burrow into the intact stratum corneum to construct almost invisible, short burrows called molting pouches. The larvae molt and resulting nymphs and molting into adults. Impregnated females leave their molting pouches and wander on the surface of the skin until they find a suitable site for a permanent burrow. While on the skin’s surface , mites hold onto the skin using sucker-like pulwilli attached to the two most anterior pairs of legs. When the impregnated female mite finds a suitable location, it begins characteristic serpentine borrow , laying eggs in the process. Under the most favorable of conditions about 10 percent of the eggs give rise to adult mite.


Transmission

Transmission

  • Occurs primarily by the transfer of the impregnated females during person-to-person, skin-to-skin contact.

  • Scabies can also be transmitted through contact with the bedding or clothing or infected persons and mites can survive up to 24 hours outside the skin.


Symptoms

Symptoms

The most common symptoms of scabies is itching and skin rash, all caused by sensitization (a type of “allergic” reaction) to the proteins.

feces of the parasite and can be find at the following places of the body:

Between the fingers

Wrist

Elbow

Armpit

Nipple

Waist

Buttocks

Shoulder blades


Symptoms1

Symptoms

  • Crusty or scaly skin which is called crusted (Norwegian) scabies (more severe). Affects the elderly, immunocompromised or persons who have conditions that prevent them from itching and scratching.


Diagnosis

Diagnosis

  • Examination of skin for mite burrows

  • Skin scraping to look for mites or eggs under the microscope


Treament

Treament

  • The current treatment of choice is the topical use of permethrin cream (5%). 

  • Crotamiton and ivermectin are alternative drugs. 

  • Ivermectin is effective for treating crusted scabies in immunocompromised person.

  • No vaccine

  • nna


Control

Control

  • Don’t share personal items such as combs, clothes, towels, bedding

  • žChange clothing regularly

  • žWash bedding regularly


Video

Video

  • http://animal.discovery.com/videos/monsters-inside-me-scabies-mites-and-the-itch.html


Review

Review

  • How is it transmitted between humans?

  • How is it diagnosed?

  • What is the treatment?

  • What is one control method?


References

References

  • http://www.stanford.edu/group/parasites/ParaSites2009/LeighaWinters_Scabies/LeighaWinters_Scabies.htm

  • http://www.cdc.gov/parasites/scabies/prevent.html

  • http://animal.discovery.com/videos/monsters-inside-me-scabies-mites-and-the-itch.html


  • Login