Please enable JavaScript.
Coggle requires JavaScript to display documents.
Equine Insect Hypersensitivity - Coggle Diagram
Equine Insect Hypersensitivity
general
most common cause of equine pruritus
climate
seasonal in temperate
young round in warm
hereditary predisposition
worsens with age
cause
Culicoides
simulium
Haematobia
Stomoxys
occassionally
mosquitos
horse flies
allergic disoder; can only be controlled
pathogenesis
hypersensitiivity developed against salivary Ags
types
I
IV
history
seasonal or year-round
one horse
affected
signs improve with fly control and/or glucocorticoids
worsens each year
CS
one animal
affectsed
rare in horses <1y
breed predispositions
QH
Arabians
icelandic
german shire
connemaras
ponies :<3:
severe pruritus
lesions
intial crusty papules
later
alopecia
excoriation
lichenification
pigment changes
"rat tail"
"buzzed off" mane
distribution
classic on dorsal surface
ventral
combo
rarely
mane
withers
ddx
pruritic disorders
affecting one animal on farm
food allergy
atopic dermatitis
affecting multiple animals on farm
mange
lice
insect bite dermatitis
diagnosis
history and CS
rule out other pruritic dermatoses
skin biopsy uninteresting
treatment
avoid insect exposure
residual insecticides
repellents
stabling during peak insect activity
dusk
dawn
eliminate larval development areas
separate cattle and equids
mechanical devices
face masks
vests
anti-inflammatory/pruritic drugs
prednisol
one
hydroxyzine
topical antipruritics
allergen-specific immunotherapy skin test?
immunotherpay
efficacy disputed
needs 12mos