Difference between revisions of "Demodex"

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===Identification===
 
===Identification===
The Demodex species have a distinctive cigar shaped appearance under microscopic examination. They have four pairs of stumpy legs on the anterior portion of the body. This distinctive long and narrow appearance allows them to burrow into and remain inside hair follicles.
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The ''Demodex'' species have a distinctive cigar shaped appearance under microscopic examination. They have four pairs of stumpy legs on the anterior portion of the body. This distinctive long and narrow appearance allows them to burrow into and remain inside hair follicles.
  
 
===Life cycle===
 
===Life cycle===
Demodex species complete their entire life cycle within the hair follicles and sebaceous glands of a single host. Transmission between hosts occurs by close contact usually these will be commensals of the host from a young age due to maternal transfer to the neonate during suckling. Their life cycle takes 3 weeks to complete. <br/>
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''Demodex'' species complete their entire life cycle within the hair follicles and sebaceous glands of a single host. Transmission between hosts occurs by close contact usually these will be commensals of the host from a young age due to maternal transfer to the neonate during suckling. Their life cycle takes 3 weeks to complete. <br/>
 
'''Eggs'''
 
'''Eggs'''
 
*20-24 laid at a time into hair follicles.
 
*20-24 laid at a time into hair follicles.
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===Important Species===
 
===Important Species===
*Demodex canis  
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*''Demodex canis''
 
::This is by far the most commonly seen species of Demodex causing clinical problems. Its host species is the dog and demodicosis is usually a secondary opportunistic pathogen due to other underlying conditions.
 
::This is by far the most commonly seen species of Demodex causing clinical problems. Its host species is the dog and demodicosis is usually a secondary opportunistic pathogen due to other underlying conditions.
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*''Demodex criceti'' & ''Demodex aurati''
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::Cause hair loss in Hamsters
  
  

Revision as of 18:35, 5 July 2010

Demodex canis - Wikimedia Commons

Demodex spp. are found on all domestic mammals as well as in humans and are usually a commensal organism. It is a burrowing mite as opposed to the surface mite meaning that it penetrates into the hosts tissue. Each host has a specific species of the Demodex mite. A clinical infection of Demodex spp. is termed demodicosis.

Identification

The Demodex species have a distinctive cigar shaped appearance under microscopic examination. They have four pairs of stumpy legs on the anterior portion of the body. This distinctive long and narrow appearance allows them to burrow into and remain inside hair follicles.

Life cycle

Demodex species complete their entire life cycle within the hair follicles and sebaceous glands of a single host. Transmission between hosts occurs by close contact usually these will be commensals of the host from a young age due to maternal transfer to the neonate during suckling. Their life cycle takes 3 weeks to complete.
Eggs

  • 20-24 laid at a time into hair follicles.

Larvae

  • Hexapod
  • 3 larval stages before becoming adult

Important Species

  • Demodex canis
This is by far the most commonly seen species of Demodex causing clinical problems. Its host species is the dog and demodicosis is usually a secondary opportunistic pathogen due to other underlying conditions.
  • Demodex criceti & Demodex aurati
Cause hair loss in Hamsters