Introduction to equine derm Flashcards
Describe type 1 hypersensitivity - give horse example
IgE mediated involving the release of histamine by mast cell.
e.g. Insect-bite hypersensitivity AKA Sweet itch
Describe type 2 hypersensitivity - give a horse example
IgG mediated cytotoxic response associated with complement binding.
e.g. Pemphigus complex
Describe type 3 hypersensitivity- give a horse example
Immunocomplex deposition on endothelial beds
e.g. Pastern leukocytoclastic vasculitis, purpura haemorrhagica, Lupus..
Describe type 4 hypersensitivty- give a horse example
T- cell mediated.
e.g. Insect-bite, drug eruptions
if skin lesions are on mane, tail and ventral line what is a likely cause
insect-bite hypersensitivity
if skin lesions are on base of tail- list 3 possible causes
Oxyuris equi AKA pinworm
Insect-bite hypersensitivity
Lice infestation (normally more truncal)
If skin lesion on group, chest, neck and sometimes face- name a possible cause
fungal infection
If skin lesions affect back, chest, rump and sometimes face- what is a likely cause
rain scald
if skin lesions affect distal limbs- list 2 possible causes
“Mud fever” : bacterial ± fungal
Mite infestation: Trombiculiasis, chorioptic mange
If skin lesion affects truncal, neck and occasional head- list 3 possible causes
urticarias
atopia
lice infestation
If skin lesions affect back and girth area- list 2 possible causes
contact dermatitis
fungal infection s
List 10 skin lesions that are defined as primary
macule
patch
papule
plaque
vesicle
pustule
wheal
nodule
tumour
abscess
List 7 skin lesions that we define as secondary lesions
alopecia
scale
crust
erosion
ulcer
lichenification
hypo/hyperpigmentation
what are coat brushing good to diagnose
ectoparasites
what can skin scrpaes be used to diagnose
mites
dermatophytes
