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Is it sheep Scab?
C S Parker BVM&S DBR MRCVS
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Sheep scab
<1992 < 100 outbreaks per year Deregulation 1992 Everywhere except Australia/ N Zealand 100% morbidity
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Sheep scab
Intense pruritis Rub shoulders or flanks
along ground Clawing/biting 1-5mm sores Serous exudation
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exudate
Large areas develop 5 – 40 cm Shoulders + dorsum
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Chronic Lesions
Skin becomes thickened
Flake like scabs Thick walled abscesses Can have seizures
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Side effects
Seromas Fluid filled swellings Myositis Aural haematomas
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Age & species
More severe in lambs & yearlings.
Different strains mites Long heavy fleeces Chronic carrier states
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Treatments
Ivomec Dectomax Cydectin
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Sheep scab
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Chorioptic Mange
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Chorioptic Mange
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Chorioptic Mange
Thought to be eliminated before 2001
Slow build up Not seen in lambs
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Chorioptic Mange
Itchy feet fetlocks Scrotal lesions
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Forage mites
Late summer Quite itchy Grass or infected forage
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Fly strike
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Fly strike
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Headflies
Feed on wounds Base of polls of young
sheep Active June to
September
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Keds
Wingless flies 5 -7mm long Live on host Build up in Autumn &
Winter Scottish Islands
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Lice
Increased as dipping decreased.
25% flocks infected Populations fall in Hot
or wet weather Eggs on fleece Itchy feet
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Lice
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Non Parasitic Diseases!
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Photosensitisation
Plocteach! Movement poor to lush
pasture Excess dietary
Chlorophyll Skin active poisons- St
Johns Wort!
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Photosensitisation
2ndry to liver disease Inherited condition in
Southdown & Corriedale
10% effected in some Scottish flocks
Bog Ashphodel
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Photosensitisation – clinical signs
Wool free areas + midline of spine?
Anorexic, mildly itchy Lambs loose condition Oedema of face Seepage of fluid with
yellow crusts
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Wool Slip
Large symmetrical areas wool loss
Common in winter shorn housed sheep
Stress induced No skin signs
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Trauma !!
Chemical burns – phenolic dips
Scab sheep more susceptible
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Orf
Needs contact with scabs +break in skin
Young lambs teeth errupting
Lasts 4 – 6 weeks Can have PI animals No colostral immunity
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Orf – clinical signs
Reddening + swelling Scabs shed at 3 weeks Cycles of proliferation &
repair Muzzles lips teeth in
lambs or weaned lambs
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Orf atypical lesions
Base of teats Ears Coronary band +
fetlocks Around genitals
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Dermatophilus
Lumpy wool Outbreaks follow
prolonged wet weather Ears + nose most
common Chronic form scaly
areas on back Low grade pruritis
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Pyodermas
Infected ulcers Face + eye area Tagging & troughs
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Necrotic Dermatitis
Pseudomonas Prolonged soaking of
fleece Usually within 6 weeks
shearing Large ulcers under wool Foul green pus Internal abscesses fatal
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Actinobacillosis
Skin thickening Multiple 5mm nodules in
skin of face, thick white pus
Kings Evil!
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Caseous lymphadenitis
Lymph nodes
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Ringworm
Crusty lesions on neck & ears
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Combined lesions
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