1. Is it sheep Scab? C S Parker BVM&S DBR MRCVS

2. Sheep scab <1992 < 100 outbreaks per year Deregulation 1992 Everywhere except Australia/ N Zealand 100% morbidity

3. Sheep scab Intense pruritis Rub shoulders or flanks along ground Clawing/biting 1-5mm sores Serous exudation

4. exudate Large areas develop 5 – 40 cm Shoulders + dorsum

6. Chronic Lesions Skin becomes thickened Flake like scabs Thick walled abscesses Can have seizures

7. Side effects Seromas Fluid filled swellings Myositis Aural haematomas

8. Age & species More severe in lambs & yearlings. Different strains mites Long heavy fleeces Chronic carrier states

9. Treatments Ivomec Dectomax Cydectin

10. Sheep scab

12. Chorioptic Mange

14. Thought to be eliminated before 2001 Slow build up Not seen in lambs

15. Chorioptic Mange Itchy feet fetlocks Scrotal lesions

16. Forage mites Late summer Quite itchy Grass or infected forage

18. Fly strike

20. Headflies Feed on wounds Base of polls of young sheep Active June to September

21. Keds Wingless flies 5 -7mm long Live on host Build up in Autumn & Winter Scottish Islands

22. Lice Increased as dipping decreased. 25% flocks infected Populations fall in Hot or wet weather Eggs on fleece Itchy feet

23. Lice

24. Non Parasitic Diseases!

25. Photosensitisation Plocteach! Movement poor to lush pasture Excess dietary Chlorophyll Skin active poisons- St Johns Wort!

26. Photosensitisation 2ndry to liver disease Inherited condition in Southdown & Corriedale 10% effected in some Scottish flocks Bog Ashphodel

27. Photosensitisation – clinical signs Wool free areas + midline of spine? Anorexic, mildly itchy Lambs loose condition Oedema of face Seepage of fluid with yellow crusts

29. Wool Slip Large symmetrical areas wool loss Common in winter shorn housed sheep Stress induced No skin signs

30. Trauma !! Chemical burns – phenolic dips Scab sheep more susceptible

31. Orf Needs contact with scabs +break in skin Young lambs teeth errupting Lasts 4 – 6 weeks Can have PI animals No colostral immunity

32. Orf – clinical signs Reddening + swelling Scabs shed at 3 weeks Cycles of proliferation & repair Muzzles lips teeth in lambs or weaned lambs

33. Orf atypical lesions Base of teats Ears Coronary band + fetlocks Around genitals

35. Dermatophilus Lumpy wool Outbreaks follow prolonged wet weather Ears + nose most common Chronic form scaly areas on back Low grade pruritis

37. Pyodermas Infected ulcers Face + eye area Tagging & troughs

38. Necrotic Dermatitis Pseudomonas Prolonged soaking of fleece Usually within 6 weeks shearing Large ulcers under wool Foul green pus Internal abscesses fatal

40. Actinobacillosis Skin thickening Multiple 5mm nodules in skin of face, thick white pus Kings Evil!

41. Caseous lymphadenitis Lymph nodes

42. Ringworm Crusty lesions on neck & ears

44. Combined lesions