Canis ISSN: 2398-2942

Cheyletiella yasguri

Synonym(s): Cheyletiella parasitovorax, C. yasguri

Contributor(s): Rosanna Marsella

Introduction

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Clinical Effects

Epidemiology

Habitat

  • Adults, larvae and nymphs on the surface of the dorsum of dogs Cheyletiella yasguri walking dandruff ; egg attached to hairs.
  • Mites normally do not live on man, just transferring over to bite.

Lifecycle

  • See life cycle diagram Lifecycle Cheyletiella yasguri - diagram :
    • Adult.
    • Egg.
    • Larva.
    • Nymphs.

Transmission

  • Direct contact.
  • Mites are very mobile and so contagious, transferring readily.
  • Transfer of mites from an asymptomatic bitch to her puppies is important and, with the puppy not developing clinical signs until perhaps 3-4 months old, the source of the infection may remain untreated.
  • Females, shown to survive off the host experimentally, probably play little part in transmission.

Pathological effects

  • Signs of dermatitis relate to host's hypersensitivity reaction to mites.
  • Man: commonly, first reaction is erythematous, papular, pruritic dermatitis probably due to delayed type IV hypersensitivity reaction.
  • May be asymptomatic, eg older carrier dogs.
  • Puppies usually show mild or severe seborrheic lesions with dry or oily scales (very dandruffy) with or without a papular eruption beginning usually over the lumbosacral area and spreading along the dorsal surface to the head and sometimes down flanks.
  • Little hair loss.
  • Pruritus varies from very mild to intense.

Other Host Effects

  • Feed on keratin layer of epidermis and also penetrate skin with mouthparts to suck tissue fluids.

Control

Control via animal

  • Acaricide; treat all in-contact animals particularly older (asymptomatic) carriers.
    Includes cats because the level of transmission, if any, between dogs and cats is unknown.Infection often persists because of failure to treat at least 2 times at weekly intervals if using non-persistent acaricides.

Control via chemotherapies

  • Cheyletiella mites are susceptible to most commonly used insecticides/acaricides, eg sprays, sponge-ons (organophosphates, carbamates, pyrethroids), fipronil Fipronil.

Control via environment

  • Assuming females can survive in the environment, it may be useful to vacate kennel or bedding for several days. Often environmental treatment with an acarcide is recommended.

Diagnosis

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Further Reading

Publications

Refereed papers

Other sources of information

  • Griffin C E, Kwochka K W & Macdonald J M (1993) Current Veterinary Dermatology - the science and art of therapy. Mosby Year Book. pp 90-95.

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