Gamasidiosis B88.0

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Synonym(s)

Bird mite scabies; Chicken mite scabies; Gamasidiosis; Predatory mite scabies

Definition
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Worldwide occurring parasitosis caused by blood-sucking chicken and bird mites.

Pathogen
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Dermanyssidae (predatory mites), e.g. Dermanyssus avium and gallinae from the family Gamasidae. The 0.1 cm large, often red and very agile mites are temporary ectoparasites of birds, rodents and reptiles, which live in cracks or crevices in the stable walls or floors during the day and visit their hosts at night. Infection of humans at work in bird cages, chicken houses or similar. Man is a false host.

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Dermatology

Nummular dermatitis

Polyetiologic clinical picture. The disease is generally defined as a therapy-resistant, disseminated, usua...

Localization
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Especially uncovered skin areas.

Clinical features
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7-10 days lasting, urticarial, also macular to small papular, possibly eczematous skin changes; severe itching. In children severe, possibly vesicular reactions. Mites are usually undetectable, as they migrate quickly after the blood meal.

Therapy
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Symptomatic external therapy e.g. with 1% hydrocortisone cream(hydrogals, hydrocortisone cream hydrophilic 0.25/0.5 or 1% -NRF 11.36.-), if necessary 0.05% betamethasone lotio (betagals, hydrocortisone cream hydrophilic 0.25/0.5 or 1% - NRF 11.36.- ). Removal of contaminated bird nests and cages or sanitation with insecticides.

Prophylaxis
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Treatment of stables and cages e.g. with Chevi-tren or Malathion (Organoderm).

Notice! Mites can transmit viruses and rickettsia!

Literature
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Beck W (1996) Animal mites as epizoonotic agents and their importance in dermatology. dermatologist 47: 744 748
Chirico J et al (2003) The poultry red mite, Dermanyssus gallinae, a potential vector of Erysipelothrix rhusiopathiae causing erysipelas in hens. Med Vet Entomol 17: 232-234
Thekisoe MM et al (2003) Diseases of free-ranging chickens in the Qwa-Qwa District of the northeastern Free State province of South Africa. J S Afr Vet Assoc 74: 14-16
Valera F et al (2003) Interspecific parasite exchange in a mixed colony of birds. J Parasitol 89: 245-250
Zenner L et al (2003) Preliminary studies of the monitoring of Dermanyssus gallinae in free-range poultry farms. Br Poult Sci 44: 781-782