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36 Contact Atopy in Five Horses on the Same Property History and Presentation ACVSC Proceedings Dermatology Chapter Science Week 2005 Ken Mason Five of 20 horses on a single property had developed a pruritic dermatitis over several years. The affected horses were approximately 10 to 15 years old having been obtained as adults. The five were a grey Arab cross gelding, a bay thoroughbred gelding a grey Dartmoor cross pony mare and a mare and a gelding Percherons. The history indicated that the skin problem started in summer and progressed through till autumn then settled in winter to spring. Examination results All horses were in good condition and seemed well systemically. The clinical signs were of a very itchy dermatitis on the limbs and face only and seemed to show a water line effect below which primary lesions were erythema and macular papular eruptions and secondary lesions of self trauma causing exudative and bleeding abrasions and alopecia. Test results Intradermal skin testing with a panel of environmental allergens including typical insects found around horses on the grey Arab cross gelding revealed several grass and insect positive reactions. Scratch testing with parts of plants collected from the paddocks in which the horses grazed revealed positive immediate reactions to the pasture grasses kikuyu (Pennisetum clandestinum)and couch (Cynodon spp.) and billy goat weed (Ageratum houstonianum) but no reaction to sow grass (Paspalum conjugatum bergius) and broad leaf paspalum (Paspalum dilatum). Isolation of the horses into dirt floored yards( with no plants) adjacent to the grazing paddocks resulted in all skin signs disappearing. Returning the horses to the grazing paddocks caused return of the skin lesions. Discussion The grey Arab horse tested and reactive on test to kikuyu, couch and billy goat weed had lesions that corresponded to the height of these plants touching the limbs and face when the horse was feeding. One throughbreed not allergy tested had lesions
much higher and corresponded to the much taller sow grass. The owner reported that the horse refused to pass through patched of this grass when it was "seeding" and if forced to would stomp its feet and chew at the limbs where the grass had touched the skin. Washing the limbs down and isolating the horse off the paddock with this grass and broad leaf paspalum resulted in signs resolving. Thus it would seem that these horses had contact allergy to these pasture plants and that the other insect reactions and pollens to which it was positive on intradermal skin test were not related to the skin lesions, as the horses would have still been exposed to these environmental allergens while yarded adjacent to the grazing paddocks. The paddock plants suspected to be the cause due to positive allergy tested with a crude saline extract were only allergic when pollen and seed heads were developed in summer and autumn. ACVSC Proceedings Dermatology Chapter Science Week 2005 37
Page 1 and 2: Australian College of Veterinary Sc
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Page 5 and 6: 3.00 Afternoon tea 3.30 How I treat
Page 7 and 8: Dr Jennifer A. Charles BVSc MVS Dip
Page 9 and 10: Scientists in Feline Medicine in 19
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Page 13 and 14: years, median age 6.5 years, with a
Page 15 and 16: dusts, grain smuts, moulds, danders
Page 17 and 18: References: Evans AG, Paradis MR, &
Page 19 and 20: Comparatively simple, cheap and eff
Page 21 and 22: TABLE 1: CURRENT ALLERGENS SELECTED
Page 23 and 24: AmericanCockroach Cockroach mix
Page 25 and 26: Patient Preparation Drug Withdrawal
Page 27 and 28: Each injection site is visually exa
Page 29 and 30: References 1. Scott DW, Miller WH:
Page 31 and 32: Intradermal Testing (IDT) in Horses
Page 33 and 34: TABLE 2 Additional allergens used i
Page 35: Allergen Positive reactions Mosquit
Page 39 and 40: and this and other uncontrolled tri
Page 41 and 42: Introduction Diagnostic Approach to
Page 43 and 44: Wheals vary in size and shape and q
Page 45 and 46: References Evans AG, Paradis MR & O
Page 47 and 48: Introduction: Equine Chronic Urtica
Page 49 and 50: Acute treatment - Epinephrine 1:100
Page 51 and 52: anecdotal success with use of human
Page 53 and 54: an 80:20 mixture of evening primros
Page 55 and 56: Clinical approach to the horse with
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Page 59 and 60: Equine sarcoidosis Sonya Bettenay T
Page 61 and 62: described as a possible feature of
Page 63 and 64: others 2001), isotretinoin(Waldinge
Page 65 and 66: 12. LeGall, F., Loeuillet, L., Dela
Page 67 and 68: Introduction The equine sarcoid: an
Page 69 and 70: Clinical Presentation Small fibrous
Page 71 and 72: Assessment should be made on the fo
Page 73 and 74: (ix)Bone becomes devitalized if inc
Page 75 and 76: and mitomycin C have been used. All
Page 77 and 78: Owen LN & Barnett KC (1983) - Treat
Page 79 and 80: any anatomic location but commonly
Page 81 and 82: epidermis may be histologically nor
Page 83 and 84: References D.C. Knottenbelt, S. Edw
Page 85 and 86: indicated. Each sample for culture
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Proper dosage and proper duration a
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2. Affect on the horse and 3. Affec
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Affected horses usually scratch and
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How I treat: equine pemphigus folia
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Treatment of pemphigus foliaceus in
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SCOTT, D.W., WALON, D.K., SLATER, M
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Diagnosis History of access of hors
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References Alfaro AA & Mendoza L (1
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Authors recommendations: 1. Both Im
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chorioptic mange by the author (Lit
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Clinical Disease The clinical resul
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treatment options have been used. P
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Notes ACVSC Proceedings Dermatology
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