Cheyletiellosis
Issue Description
Is a mild dermatitis caused by mites of the genus Cheyletiella. It is also known as walking dandruff due to skin scales being carried by the mites. Cheyletiella
live on the skin surface of dogs, cats, rabbits, and humans. The adult mites are about 0.385 millimeters long, have eight legs that have combs instead of claws, and
have palpi that end in prominent hooks. They do not burrow into the skin but live in the keratin level. Their entire 21 day life cycle is on one host. They cannot
survive off the host for more than 10 days. Cheyletiellosis is seen more commonly in areas where fleas are less prevalent, because of the decreased use of flea
products that are also efficacious for the treatment of this mite.
Symptoms
Cheyletiellosis is highly contagious. Transmission is by direct contact with an affected animal. Symptoms in animals vary from no signs to intense itching, scales on
the skin, and hair loss. The lesions are usually on the dorsum of the animal. Symptoms in humans include multiple red, itchy bumps on the arms, trunk, and buttocks.
Because humans are an irregular host for the mite, the symptoms usually go away in about three weeks.
Diagnosis
Diagnosis is by finding the mites or eggs microscopically in a skin scraping, combing, or on acetate tape applied to the skin.
Treatment
The most common treatment in animals is weekly use of some form of topical pesticide appropriate for the affected animal, often an anti-flea product. Fipronil works
well, especially in cats. In unresponsive cases, ivermectin is used, Selamectin is also recommended for treatment. None of these products are approved for treatment
of cheyletiellosis. Other pets in the same household should also be treated, and the house or kennel must be treated with an environmental flea spray.
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