2. CASE #6

3. NON-BURROWING MITES

4. Cheyletiellosis “walking dandruff” Affects dogs, cats, rabbits, humans
Feed on lymph
Eggs deposited on hair shafts
Highly contagious among animals
Direct contact and fomites

5. Cheyletiellosis Clinical Signs Severity of pruritis varies
Dry scales along back => entire body
Patchy hair loss from scratching

6. Cheyletiellosis Dx: Rx:
collect scales with clear tape, flea comb, skin scraping and ID with microscope
Rx:
Weekly baths with flea control products containing pyrethrins or permethrin and/or lime sulfur dip

7. CASE #7

8. Warbles (Cuterebra)
Adult fly lays eggs => larvae penetrates skin of animals=>matures=> leaves animal to become an adult fly
Dx: swelling of skin behind ears with opening – can see larvae

9. Warbles (cuterebra) Tx: open fistula and remove larvae
Flush wound (betadine, Nolvasan)
Oral antibiotics for skin infection
Client Info: keep animals in fly-free environment

10. Warbles (Cuterebra)
Botfly, genus cuterebra

11. “The light at the end of the tunnel is not an illusion.
HANG IN THERE!
“The light at the end of the tunnel is not an illusion.
The tunnel is.”

12. CASE #8

13. Botfly ( Order Diptera)

14. Myiasis
Many spp. of flies lay eggs on wet, warm, damaged skin => larvae are maggots
Dx: visually seen under matted hair with foul odor
Rx: Clip hair
Flush wound, clean daily
Antibiotics
Keep indoors to prevent re-infection
Client info
Disease of neglect
More common in heavy coated animals in summer
Do not use dips to remove maggots

15. CASE #9

16. Dog Lice (Linognathus setosus)

17. Dog Lice Host specific disease of neglect
Dx: lice cause intense itching
Blood suckers => anemia if heavy infestation
Presence of lice or nits or eggs diagnostic Rx
Treat all animals in house with dip, shampoo or dust
Topical insecticides used for fleas and ticks are adequate
Wash bedding thoroughly
Ivermectin orally (extra-label use)
Client Info
Humans don’t get lice from pets

18. Case #10

19. Dermatophytosis Superficial cutaneous infection
3 primary dermatophytes
Microsporum canis
Trichophyton mentagrophytes
Microsporum gypseum
Cat: 90% M. canis; Dog: all 3

20. Dermatophytosis Transmission Direct contact
Contact with infected hair and scale through fomites
Spores small and easily aerosolized
Fleas
Infected hairs – infective for up to 18 months
Incubation period 1-3 weeks
M. canis – cats
Trichophyton – rodents or nests
M. gypseum – geophilic (soil)
More common in moist, warm environments

21. Dermatophytosis Clinical Signs Mimics other skin diseases
Hair loss, scaling and crusting
+/- pruritus
Cats
Mimics other skin diseases
Can form ulcerated dermal nodules
Dog
Focal or multifocal areas of hair loss
Papules, scales and crusts
Central area of hyperpigmentation

22. Dermatophytosis Dx: Wood’s Light – UV light Quick and easy screen
50% of M. canis fluoresce, rest do not
Differentiate from scale, dust, dirt
Lamp must warm up for 5 minutes prior to exam.

23. Wood’s lamp

24. Dermatophytosis Tx Dx Fungal culture – definitive
Color change to red in 1-3 weeks
Confirm with microscopic exam Tx
Usually self curing in healthy animal – may take 2-3 months, esp. in kittens
3 elements to effective treatment:
Topical – reduces contamination on hair coat
Systemic- reduces healing time
Environmental-decreases contamination and spread

25. Microsporum canis

26. Trichophyton mentagrophytes

27. Microsporum gypseum

28. Dermatophyte Test Media (DTM)

29. Dermatophytosis – Treatment
Clip haircoat, particularly long hairs
Topicals
Spot treatment may predispose to subclinical infections
Whole body shampoos, dips, rinses twice weekly
Lime-sulfur at 8oz/gal
Miconazole containing shampoos

30. Dermatophytosis-Treatment
Systemic tx
Griseofulvin
GI absorption variable
Adverse effects
Vomiting/diarrhea, anorexia
Bone marrow suppression
Neurologic signs
Ketoconazole
Potential liver toxicity
Itraconazole
Less Side effects
Tx till resolution of signs and 2 negative cultures

31. Dermatophytosis – Treatment
Environment
Remove or discard all bedding, brushes, fabric toys, etc
Cheap vacuum to clean with, then discard
Clean all surfaces; use bleach
Vacuum daily
Disinfect weekly
Catteries – strict isolation

32. Dermatophytosis – Zoonosis
At risk populations: children, immune suppressed adults, older adults
Cats can be carriers w/o clinical signs

33. Ringworm (human)