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Dermatology (VEM 5387) > Scabies & Other Parasitic Skin Disease (Marsella) > Flashcards

Scabies & Other Parasitic Skin Disease (Marsella) Flashcards

1
Q

Canine scabies

A
  • Sarcoptes scabei canis
  • Not host specific (zoonotic)
  • Contagious
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2
Q

Sarcoptes mite

A
  • Male mite on skin surface
  • Female burrows into stratum corneum
  • Egg → larvae (6 legs) → nymphs (6 legs) → adults (8 legs)
  • Life cycle 3 wks
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3
Q

Sarcoptes transmission

A

Direct contact. Does not survive long in the environment (48 hrs).

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4
Q

Sarcoptes zoonosis

A
  • Rxn with in 24 hrs
  • Pruritic papules
  • S. scabei canis does NOT reproduce on human skin
  • Lesions resolves within 12-14 days, if no further contact w/ affected dogs
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5
Q

Rapidity and severity of lesions and pruritis of canine scabies depends on

A
  • previous exposure
  • # of mites
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6
Q

Pathogenesis of canine scabies pruritis

A
  • hypersensitivity
  • mechanical irritation
  • pruritogenic substances from saliva & species
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7
Q

Canine scabies clinical features

A
  • Intense pruritis
    • Ventral abdomen, pinnae, hocks, elbows
  • Papules
  • Excoriations, crusts, alopecia
  • 2º infections
  • Chronic dz
    • hyperpigmentation
    • lymphadenopathy
    • wt loss
    • hyperglobulinemia
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8
Q

Norwegian scabies

A
  • Rare
  • Thick crusts
  • Numerous mites
  • Little pruritis
    • Immunosuppressed
    • Steroids
    • Puppies
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9
Q

Scabies incognito

A
  • Well groomed animals
  • Intense pruritis
  • No lesions
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10
Q

Canine scabies diagnostics

A
  • Clinical signs
  • Superficial skin scrape (w/ KOH)
    • Margins of pinnae, elbows, hocks
  • Response to treatment
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11
Q

Canine scabies therapy

A
  • Topical
    • Lime sulfur dip (LymDip)
    • Selamectin (Revolution)
    • Fipronil (Frontline)
  • Systemic
    • Ivermectin (Ivomex, Heartgard)
    • Milbemycin (Interceptor)
  • Treat all animals in contact
  • Pruritis may persist for short time after treatment
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12
Q

Feline scabies

A
  • Notoedric mange
  • Rare
  • Zoonotic
  • Life cycle 21 days
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13
Q

Feline scabies clinical signs

A
  • Extreme pruritis
  • Erythema, crusting papules
  • Distrubution
    • Head & neck
    • generalized
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14
Q

Feline scabies diagnosis

A
  • Clinical signs
  • Superficial skin scrape
  • Response to treatment
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15
Q

Feline scabies therapy

A
  • LymDip
  • Revolution
  • Ivermectin
  • Treat all animals in contact
  • Extend treatment beyond duration of life cycle
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16
Q

Cheyletiella

A
  • “Walking dandruff”
  • Large, obligate parasite w/ hooklike mouthparts
  • Spends entire life on host but can survive in environment for 10 days
  • C. yasguri (dogs), C. parasitovorax (rabbits), C. blakei (cats)
  • Zoonotic
17
Q

Cheyletiella pathogenesis

A

Digesting enzyme secretion (eat dissolved skin) → skin irritation → scratching, hairloss, scabs, wounds

18
Q

Cheyletiella zoonosis

A
  • Transient zoonosis
    • Unable to reproduce on human skin
  • Papular eruptions & pruritis
  • Self limiting once source of infection has been removed
19
Q

Cheyletiella life cycle

A
  • Completed in 3 wks
  • Eggs → larvae (6 legs) → nymphs (8 legs) → adults (8 legs)
20
Q

Cheyletiella clinical signs in dogs

A
  • Puppies
  • Scaling and pruritis
  • Dorsal distribution
21
Q

Cheyletiella clinical signs in cats

A
  • Miliary dermatitis
  • Mild-mod pruritis
  • Asymptomatic carriers
22
Q

Cheyletiella clinical signs in rabbits

A
  • Scaling
  • Scapular area often affected
  • No primary lesions
23
Q

Cheyletiella diagnosis

A
  • Demonstration of eggs or mites
    • Combing technique
    • Superficial skin scrape
    • tape impression
24
Q

Cheyletiella therapy

A
  • Pyrethrin
  • Lime sulfur dips
  • Ivermectin
  • Fipronil (NOT IN RABBITS)
  • Selamectin
  • Clean environment
25
Q

Pediculosis in dogs caused by

A
  • Trichodectes canis (biting lice)
  • Linognatus setosus (sucking lice)
26
Q

Pediculosis

A
  • Host specifc (not zoonotic)
  • Spends entire life cycle on host
    • limited survivial in environment
  • Life cycle 3 wks
  • Spreads via direct contact
27
Q

Pediculosis cinical signs

A
  • Esp. in winter months
  • Range from asymptomatic to intense pruritis
  • Few direct lesions
  • 2º excoriations
  • Seborrhea
  • Anemia
  • Matted coat w/ nits (eggs)
28
Q

Pediculosis diagnosis

A
  • ID of lice & eggs
    • Brush
    • Acetate tape impression
    • Magnifying lens
29
Q

Pediculosis therapy

A
  • Clip coat in long-haired animals
  • Treat to cover life cycle
  • Pyrethrins
  • Fipronil
  • Lime sulfur dips

Dermatology (VEM 5387) (17 decks)

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