here - Australian College of Veterinary Scientists
here - Australian College of Veterinary Scientists
here - Australian College of Veterinary Scientists
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
The typical histologic appearance <strong>of</strong> insect hypersensitivity is a superficial and deep<br />
perivascular to interstitial eosinophilic dermatitis with focal areas <strong>of</strong> infiltrative to<br />
necrotising eosinophilic mural folliculitis and focal eosinophilic granulomas. These<br />
changes are not pathognomonic for insect hypersensitivity and may be seen with<br />
adverse food reactions and atopic dermatitis<br />
Treatment<br />
The management <strong>of</strong> insect hypersensitivity involves insect control and the use <strong>of</strong><br />
topical and systemic antipruritic agents. Treatment <strong>of</strong> unrugged, grazing horses<br />
is difficult and frustrating. Secondary bacterial infections must be recognized and<br />
treated.<br />
Insect control<br />
92<br />
• Stable horses between 4pm and 8am<br />
• Cover horses with rugs and hoods<br />
• Use fine mesh screens in stables<br />
• Spray housing and screens with residual insecticides<br />
• Install floor or overhead fans in stables<br />
• Time operated spray mist insecticide systems are useful but expensive<br />
• Drain lakes, marshes, swamps, irrigation channels<br />
Fly repellents and insecticides<br />
• 4% permethrin (Permoxin ® Dermcare Vet Pty Ltd); use a 0.1% solution as<br />
a spray or rinse daily for 7 days then once a week<br />
• 0.2% fenvalerate (Sumifly Buffalo Fly Insecticide ® Fort Dodge); use 0.1%<br />
solution and apply 800ml to 1L on dorsal midline and body every 7 days<br />
• 0.15% pyrethrin, piperonly butoxide, N-octyl bicycloheptene dicarboxamide,<br />
di-N-propylisocinchromeronate, citronella (Musca-Ban Insecticidal spray ®<br />
Country Lfe Animal Health) spray/wipe-on<br />
• 0.2% pyrethrin, piperonyl butoxide, N-octyl bicycloheptene dicarboxamide,<br />
di-N-propylisocinchromeronate, diethyltoluamide, (N-Dem spray Insecticidal<br />
Lotion and Spray ® Joseph Lyddy)<br />
• 0.2% pyrethrin, diethyltoluamide, N-octyl bicycloheptene dicarboxamide, di-<br />
N-propylisocinchromeronate, benzalkonium chloride (Fly-Repella cream ®<br />
Troy Laboratories)<br />
• Commercial bath oils diluted with equal parts <strong>of</strong> water has been reported<br />
anecdotally as a useful leave on repellent<br />
ACVSC Proceedings Dermatology Chapter Science Week 2005