Ear mite

As Ohrräude (otitis externa parasitaria ) refers to the infection of the outer ear and the external auditory canal with certain mites of the genus Psoroptes, otodectic and Chorioptes. The corresponding members of these genera parasitize almost exclusively on the ear, only in very heavy infestations they can expand their infestation area to other head ( Kopfräude ) and parts of the body. On the other hand, other, do not manifest specializing in the ear mange ear, for this condition, however, the term " Ohrräude " is not common.

Pathogen

Clinical picture

A Ohrräude is usually associated with severe, borkigen lesions of the external ear and inside the ear canal. Infestation with otodectic cynotis causes thick, crumbly black-brown crusts, caused by the increased production of earwax and exudates in response to the saliva of the mite. In Psoroptes cuniculi puff -like crusts dominate. Affected animals show severe restlessness and itching, which can lead to self-mutilation. In dogs, may develop as a blood ear ( othematoma ).

As a complication of the ear infection can break through the tympanic membrane and spread to the middle and inner ear, meninges or the brain. A secondary bacterial infection of damaged skin of the ear canal is common.

The diagnosis can be already set with an otoscope, which can be identified as dark moving points in the ear canal the mites. With a microscopic examination of a smear from the ear, can secure the diagnosis. Under the microscope also reveals to what mite it is.

Treatment

Treatment consists of thorough cleaning of the ears and remove the crusts. The mite control via milbenabtötende ( acaricidal ) agents such as ivermectin (not in dogs with MDR1 ), doramectin or selamectin. Frequently, the active ingredients of so-called spot -on preparations are administered, which are dripped into the neck of the animal. Ivermectin can be administered either locally or systemically, the other two avermectins are administered systemically. Local also Fipronil is used effectively, however, the drug should not be used in rabbits. Against secondary bacterial infection antibiotic ear drops are administered. More living in the household dogs and cats should be treated as well to prevent cross contamination. Given a consistent treatment, the prognosis of ear mites in dogs is low.

Sources and Literature

• Parasitosis in animals
• Zoonosis
• Parasitosis in cats