Skin lesions in Aubrac cows strongly associated with fly bites (Haematobia irritans)

Veterinary Dermatology
Marion MoscaDidier Pin

Abstract

The horn fly Haematobia irritans is known to cause problems in cattle including weight loss and decreased milk production; cutaneous lesions have not been widely reported and descriptions of the clinical manifestations are quite variable. This study describes the clinical and histopathological lesions of several Aubrac cows that presented with focal to confluent areas of alopecia, skin scaling and thickening, suspected to be induced by H. irritans bites. Twenty seven, three- to six-year-old Aubrac cows, kept in mountain pastures in France, that presented with an apparently asymptomatic alopecic dermatosis. Samples for skin cytological evaluation, skin scrapings and trichograms were examined; also, skin biopsy specimens from affected animals were used for histopathological examination. Clinical lesions consisted of focal to coalescing, symmetrical areas of hair loss and scaling, located on the back, flanks, and lateral and caudal aspects of the thighs. Histopathological examination revealed perivascular, oedematous, eosinophilic dermatitis with eosinophilic folliculitis and furunculosis. Species identification of several flies captured on the cows revealed H. irritans. The final clinicopathological diagnosis was eosinophilic der...Continue Reading

References

Sep 1, 1981·Australian Veterinary Journal·S J JohnsonA A Grimshaw
Jul 1, 1997·Medical and Veterinary Entomology·C D SteelmanG Tolley
Oct 8, 1999·Medical and Veterinary Entomology·A A GuglielmoneO Warnke
Mar 28, 2013·Medical and Veterinary Entomology·M BreijoA Meikle

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