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Related Experiment Videos

Mosquito bite-caused eosinophilic dermatitis in cats.

K V Mason1, A G Evans

  • 1Albert Animal Hospital, Springwood, Australia.

Journal of the American Veterinary Medical Association
|June 15, 1991
PubMed
Summary

This study identifies a seasonal form of eosinophilic granuloma complex in cats, likely triggered by mosquito bites. Keeping cats indoors behind insect screens resolved lesions, confirming insect hypersensitivity.

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Area of Science:

  • Veterinary Dermatology
  • Allergy and Immunology

Background:

  • A seasonal form of eosinophilic granuloma complex (EGC) has been recently described in cats.
  • Lesions typically affect the nasal bridge, ears, and footpads.

Purpose of the Study:

  • To investigate the potential role of insect hypersensitivity, specifically to mosquitoes, in a seasonal form of feline EGC.
  • To characterize the clinical and histopathological features of this condition.

Main Methods:

  • Clinical examination and histopathological evaluation of affected cats.
  • Intradermal skin testing with mosquito extract.
  • Experimental mosquito bite challenges on affected cats.
  • Assessment of lesion response to environmental modification (insect screening).

Main Results:

  • Eight cats presented with lesions consistent with seasonal EGC.
  • Two of four cats tested showed positive reactions to mosquito extract via intradermal testing.
  • No immunoglobulin deposits were found in lesional skin.
  • Lesions resolved when cats were housed indoors with insect screening and recurred upon removal.
  • Experimental mosquito bites induced pruritic, ulcerative eosinophilic dermatitis.

Conclusions:

  • Mosquito bite hypersensitivity is a likely cause of this seasonal form of feline eosinophilic granuloma complex.
  • Environmental control, such as insect screening, can effectively manage the condition.
  • Histopathology confirms eosinophilic dermatitis at bite sites.

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