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Exotic Questions Flashcards

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Dermatology Board Prep flashcards
1
Q
  1. What antibiotics should be avoided in rabbits, guinea pigs, chinchillas, and hamsters? Name 5 and say why?
A

a. Avoid antibiotics which target gram positive bacteria and can cause fatal intestinal dysbiosis
b. Antibiotics to avoid = penicillins, macrolides, tetracyclines, lincosamides, cephalosporins

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2
Q
  1. What antibiotics can you use in rabbits? Name 6.
A

a. Enrofloxacin, TMS, chloramphenicol, metronidazole, azithromycin, penicillin G

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3
Q
  1. What 2 antibiotics cause otoxicity in guinea pigs and chinchillas?
A

a. Chloramphenicol
b. Aminoglycosides

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4
Q
  1. Give three differentials for the ulcerations in a tortoise shell.
A

Answer:
a. Superficial ulcer secondary to husbandy
b. Septicemic cutaneous ulcerative disease (SCUD)
c. Beneckea chitinovora infection
d. Mercury toxicity

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5
Q
  1. What is an important risk of topical dips or bathing in small mammals?
A

a. Hypothermia due to all over wetting

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6
Q
  1. A gerbil with erythematous skin and alopecia on the neck and dorsal midline presents for examination. You find the following mite on scraping. What should you tell owners about possible zoonosis?
A

Answer:
a. This is Ornithonyssus bacoti mite
b. It is zoonotic and can cause pruritic, papules/vesicles on the forehead and limbs in humans

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7
Q
  1. Why should you not apply dips to the face of small mammals? (2 reasons)
A

a. Aspiration pneumonia or inhalation
b. Ingestion of topical products

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8
Q
  1. Which flea preventative is toxic to rabbits?
A

a. Fipronil

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9
Q
  1. What seasonal hair changes occur in ferrets? What season does this happen?
A

a. Thin hair occurs symmetrically in Spring in the Northern hemisphere, showing alopecia of the tail, perineum, and inguinal hair with underlying brown-red waxy deposits on the skin from the sebaceous glands

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10
Q
  1. What 2 glands are responsible for odor in ferrets? Which are more important?
A

a. Sebaceous glands provide majority of musky odor and greasy feel to skin/fur
b. Anal glands produce minority of musky odor

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11
Q
  1. Where are sebaceous glands located on the rabbit versus the ferret?
A

a. Rabbit = Chin, anal glands, and paired inguinal glands
b. Ferret = over entire body

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12
Q
  1. How is the anal gland shaped in the prairie dog?
A

a. Triad of papillae

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13
Q
  1. Match the ectoparasite with the species it can infest.

a. Ferret
b. Chinchilla
c. Mouse
d. Rabbit
e. Prairie dog
f. Guinea pig
g. Rat
h. Hamster
i. African hedgehog
j. Gerbil

  1. Ctenocephalides felis felis
  2. Ctenocephalides canis
  3. Trixacarus caviae
  4. Demodex merioni
  5. Demodex aurati and D. criceti
  6. Caparinia tripilis and C. erinacei
  7. Notoedres muris
  8. Pulex irritans
  9. Otodectes cynotis
  10. Sarcoptes scabiei
  11. Spilopsyllus cuniculi
  12. Chirodiscoides caviae
  13. Psorergates simplex
  14. Trimenopen jenningsi and T. hispidum
  15. Psoroptes cuniculi
  16. Cheyletiella parasitovorax
  17. Leporacarus gibbus
  18. Liponyssus bacoti
  19. Myobia musculi
  20. Notoedres cati
  21. Gyropus ovalis
  22. Demodex caviae
  23. Notoedres notoedres
  24. Linognathus cynomys
  25. Polyplex serrata
  26. Demodex cuniculi
  27. Cuterebra species
  28. Radfordia ensifera
  29. Haemodipsus ventricosus
  30. Radfordia affinis
  31. Giricola porcelli
  32. Polyplex spinulosa
  33. Myocoptes muculinus
A

Answers:
* A (Ferret) = 1, 2, 8, 9, 10
* B (Chinchilla) = 1, 2, 16
* C (Mouse) = 13, 18, 19, 25, 30, 33
* D (Rabbit) = 1, 2, 10, 11, 15, 16, 17, 20, 26, 27, 29
* E (Prairie dog) = 24
* F (Guinea pig) = 3, 7, 10, 12, 14, 15, 16, 21, 22, 31, 33
* G (Rat) = 7, 18, 28, 32
* H (Hamster) = 5, 10, 18, 20, 23
* I (African hedgehog) = 6
* J (Gerbil) = 4, 5

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14
Q
  1. Describe the presentation of Psorptes cuniculi infestation in a rabbit. How is this treated?
A

a. Bilateral, intense pruritus and otitis externa, beginning as dry, grey-white crusted exudate in the ear canal then worsening to form layered crusts, with secondary excoriations and ear drooping
b. Treatment = ivermectin, moxidectin, or selamectin

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15
Q
  1. Describe the presentations of Sarcoptes scabiei infestation in a ferret.
A

a. Generalized (more common) = focal to generalized alopecia with intense pruritus
b. Localized on the feet only = severe inflammation, swelling, and crusting of the paws with dystrophic claws that can slough

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16
Q
  1. How long after infection with canine distemper virus do ferrets show signs?
A

a. 10 – 15 days after exposure

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17
Q
  1. True/False – lagomorphs are competent leishmaniasis reservoirs.
A

a. True

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18
Q
  1. What is CANV and how do you treat it?
A

a. Yellow fungus, the Chrysosporium anamorph of Nannizziopsis vriessi (CANV) is an ascomycetous teleomorphic fungus
b. CANV infection has been reported in a wide range of reptile species.
c. Slowly progressive and often fatal skin disease – progress from dry/hyperkeratotic plaques to exudative/necrotic ulcers, often affecting the mouth and other areas of the body (Including internally)
d. Medical treatment of confirmed cases involves itraconazole (10 mg/kg, PO, q 24 h for 6 weeks) and topical treatment with chlorhexidine solution. Serum biochemistry should be monitored for signs of liver toxicity. Surgical excision of lesions should be carried out if possible, and in conjunction with medical therapy.

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19
Q
  1. What antiparasitic treatments are safe for ferrets? Name 5.
A

a. Pyrethrin sprays safe for cats
b. Imidacloprid
c. Selamectin
d. Lufenuron
e. Fipronil
f. Ivermectin

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20
Q
  1. What 2 species of dermatophyte are commonly a problem in ferrets?
A

a. M. canis and T. mentagrophytes

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21
Q
  1. A ferret presents with bilaterally symmetric alopecia. Give the most common cause for this finding.
A

Answer = Adrenocortical hyperplasia or neoplasia

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22
Q
  1. What antibiotics can be given in rabbits, hamsters, and guinea pigs to avoid the risk of intestinal dysbiosis?
A

a. Chloramphenicol, aminoglycosides (not in rabbits!), fluoroquinolones, metronidazole, TMS, penicillin G, azithromycin

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23
Q
  1. A ferret presents with these lesions. Describe the lesions and the most likely differential. What is your prognosis?
A

Answer:
* Red-brown rash on the inguinal, perianal area and medial thighs, extending to the distal limbs
* Brown small crusts on the face periocularly, on the muzzle, and around the lips with associated swelling in all areas
* Differential = canine distemper virus
* Prognosis = close to 100% mortality

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24
Q
  1. What is the most likely cause of this rabbit’s clinical signs? Design a treatment plan for this rabbit.
A

Answer = Psoroptes cuniculi infestation, treat all rabbits using ivermectin, moxidectin, or selamectin; don’t remove crusts because they will cause pain

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25
Q
  1. Give five diagnostic tests for a ferret with suspected adrenocortical hyperplasia or neoplasia.
A

a. Palpation = enlarged left adrenal gland
b. Tennessee adrenal panel = normal cortisol, elevated sex hormones
c. Ultrasound identifies affected adrenal gland
d. Chemistry panel = elevated ALT
e. Elevated urine cortisol/creatinine ratio

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26
Q
  1. How is adrenocortical hyperplasia treated in ferrets? (2 ways)
A

a. Preferred = adrenalectomy (left easier than right)
b. Deslorelin acetate (synthetic GnRH analog) as slow release implant for 8 – 30 months relief

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27
Q
  1. What are two exotic species commonly develop infestations with this mite and how can you treat them?
A

Answer: Cheyletiella parasitovorax
a. Guinea pigs = ivermectin
b. Rabbits = ivermectin, selamectin, lime sulfur dips

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28
Q
  1. What are 2 clinical signs of hyperestrogenism in ferrets (skin and internal)?
A

a. Vulvar swelling and alopecia
b. Petechia and ecchymoses due to secondary thrombocytopenia

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29
Q
  1. What are the most common skin (3) and systemic (1) tumors in ferrets?
A

a. Mast cell tumor, basal cell tumor, sebaceous cell tumor
b. Lymphoma

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30
Q
  1. A ferret presents with a blue hairless area. What has happened and why does this occur?
A

a. Blue fur syndrome, occurs when hair is clipped during the resting phase of the hair cycle due to melanin production by hair follicles about 1 – 2 weeks before hair regrowth

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31
Q
  1. What is the most common ectoparasite in rabbits?
A

a. Psoroptes cuniculi

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32
Q
  1. What 4 non-burrowing fur mites commonly affect rabbits?
A

a. Leporacarus gibbus, Cheyletiella parasitovorax, Sarcoptes scabiei and Notoedres cati

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33
Q
  1. Describe the life cycle of a cuterebra mite.
A

a. Flies deposit eggs on the host (or on feces that are picked up), which hatch
b. Larvae enter through the nasal or oral openings of the hose
c. Larvae migrate and develop into subcutaneous cysts, each of which contains 1 larva that grows until a breathing hole/fistula forms

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34
Q
  1. What is the common flesh fly in the United States?
A

a. Wohlfahrtia vigil

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35
Q
  1. What is the common sucking louse in rabbits?
A

a. Haemodipsus ventricosus

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36
Q
  1. Identify the Caparinia and Chorioptes mites:
A

Answer: A = chorioptes, B = caparinia

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37
Q
  1. What is the most common Staphylococcal bacteria on rabbits?
A

a. Staphylococcus aureus

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38
Q
  1. What is the incubation period of syphilis in rabbits (time to lesions and time to positive titer)?
A

a. 3 – 6 weeks lesions after exposure
b. 8 – 12 weeks positive titer after exposure

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39
Q
  1. What unique characteristic do rabbit abscesses have?
A

a. They rarely rupture or drain/fistulate due to their thick capsule which contains caseous exudate – rabbit abscesses must be surgically excised

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40
Q
  1. What are the five grades of ulcerative pododermatitis in rabbits (by clinical signs)? Where are the ulcers commonly located?
A

a. Location = caudal tarsus/metatarsus or metacarpus
b. Grades:
i. 1 = hair loss
ii. 2 = erythema and swelling
iii. 3 = ulceration and scab formation
iv. 4 = abscess formation with secondary infection of tendons and deeper tissues
v. 5 = osteomyelitis, synovitis, and tendonitis with irreversible abnormal gait and stance due to displaced superficial digital flexor tendon

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41
Q
  1. What is the cause of blue-green coloration in moist dermatitis of rabbits?
A

a. Pseudomonas aeruginosa infections produce pyocyanin pigment

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42
Q
  1. What is the cause of syphilis in rabbits and how is it transmitted (3 ways)?
A

a. Treponema cuniculi
b. Transmission = venereal, direct contact, vertical transmission from the birth canal passage of an infected doe

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43
Q
  1. True/False – All rabbits with syphilis show clinical signs.
A

a. False = subclinical disease is common but can flare with overcrowing, poor sanitation, or other causes of stress

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44
Q
  1. A rabbit presents with erythema and edema of the mucocutaneous junctions with associated papules, vesicles, ulcers, scale, and crusting. What is your primary differential and what test is useful?
A

a. Differential = Syphilis (Treponema cuniculi)
b. Testing = rapid plasma reagent test (human test)

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45
Q
  1. A bird presents with scaly, crusted, grey lesions on the unfeathered regions of the body but minimal pruritus. Two other birds that have been in contact with this bird are also affected, but less severely. What is likely the cause of this problem and how do you treat it?
A

a. Knemidocoptes mites
b. Treatment = ivermectin or moxidectin topically for 2 – 3 treatments, 10 days apart

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46
Q
  1. What is the recommended treatment for Chrysosporium anamorph of Nannizziopsis vriesii (CANV) in bearded dragons? (multiple choice)
    a. Ketoconazole
    b. Voriconazole
    c. Terbinafine
    d. Amphotericin B
A

b. Voriconazole

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47
Q
  1. What is the prognosis of rabbit syphilis with treatment? What treatment is recommended?
A

a. Good = injectable penicillin G or chloramphenicol should be sufficient
b. Lesions resolve 1 – 3 weeks after starting treatment

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48
Q
  1. What is the cause of necrobacillosis (aka: Schmorl’s disease) in rabbits?
A

a. Fusobacterium necrophorum due to contamination of wounds by fecal material

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49
Q
  1. What are the characteristics of the cause of myxomatosis in rabbits?
A

a. Myxoma virus – poxvirus family, linear dsDNA, enveloped virus, causes intracytoplasmic inclusions

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50
Q
  1. How is myxomatosis transmitted and what are common susceptible reservoirs?
A

a. Transmission = insect bites, direct contact, mechanical vectors (birds, plants, fomites)
b. Susceptible reservoirs = Eastern cottontail, tropical forest rabbits, wild European rabbits, European hare

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51
Q
  1. Contrast the clinical signs/prognosis of myxomatosis in the Eastern Cottontail rabbit versus the California virus strain.
A

a. Eastern Cottontail = masses < 1 cm diameter for 1 month often around the ears and eyes, rare systemic disease and death

b. California virus strain = eyelid edema first then spreading to the perineal region, genitals, and lips, lethargy and pyrexia, skin hemorrhage, seizures – almost 100% fatal

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52
Q
  1. What is the uropygeal (preen) gland/its structure and what are its four functions?
A

a. Bilobed holocrine gland at the base of the tail

b. Functions:
i. Waterproofing and protecting feathers
ii. Secretions are source of vitamin D precursors
iii. Bacterial and fungal growth inhibition
iv. Maintaining moisture content and pliability of feathers

53
Q
  1. Describe the expected biopsy findings of myxomatosis in rabbits.
A

a. Undifferentiated mesenchymal cells surrounded by mucin, endothelial cell proliferation, intracytoplasmic inclusions, sometimes epidermal cell hyperplasia and degeneration

54
Q
  1. What are 3 dermatoses caused by orodental disease in pet rabbits?
A

a. Poor coat condition (due to difficulty grooming)
b. Superficial dermatitis in the perioral region/forelimbs (caused by hypersalivation)
c. Alopecia
d. Fungal/bacterial dermatitis

55
Q
  1. An Eastern Cottontail presents to your practice. What is your primary differential and how could this have been prevented? List three other possible differentials.
A
  • Myxomatosis, prevented through vaccination in other countries (not US) which cause rabbits to develop mild disease and usually recover with supportive care
  • Other differentials = Shope fibroma virus, Shope papilloma virus, severe Psoroptes cuniculi infestation
56
Q
  1. How do you prevent infection with myxomatosis in pet rabbits? (3 ways)
A

a. Vaccination (multiple types – homolous, recombinant, and heterologous live attenuated Shope fibroma virus)
b. Avoid contact with wild rabbits
c. House pets indoors or in screened enclosures to prevent flea and fur mite transmission

57
Q
  1. Which of the following antibiotics is safe to give to guinea pigs? (multiple choice)

a. Cephalexin
b. Doxycycline
c. Clindamycin
d. Penicillin
e. Enrofloxacin

A

e. Enrofloxacin

58
Q
  1. What are the two types of Shope viruses in rabbits? Give their characteristics.
A

a. Shope fibroma virus = poxvirus, antigenically related to myxoma virus and used in vaccination against myxomatosis in live attenuated form; enveloped, linear, dsDNA
b. Shope papilloma virus = papovaviridae, non-enveloped, dsDNA circular virus

59
Q
  1. What does the term dysecdysis imply? (multiple choice)
    a. A defect in the skin of a reptile
    b. Abnormal shedding of the dead outer skin of a reptile
    c. Abnormal wound healing in a reptile
    d. Mycotic infection of the skin of a reptile
A

b. Abnormal shedding of the dead outer skin of a reptile

60
Q
  1. What are the clinical signs of beak and feather disease virus in birds – acute and chronic forms?
A

a. Acute = immune suppression causing secondary infections that are often fatal (such as aspergillosis)
b. Chronic = changes in feather coloration, deformed beak/nails, immune suppression and secondary infection

61
Q
  1. This parasite is found on a rabbit. What is its identity?
A

Answer: Leporacarus gibbus

62
Q
  1. An adult rabbit presents with non-pruritic, flaky dermatitis on the face and neck. Give three differentials.
A
  • Sebaceous adenitis
  • Thymoma-associated exfoliative dermatitis
  • Cheyletiella parasitovorax or Leporacarus gibbus if non-pruritic
63
Q
  1. What is the causative agent of carp pox? Give its characteristics.
A

a. Cyprinid herpesvirus 1, dsDNA and enveloped virus

64
Q
  1. What do you expect to find on biopsy of sebaceous adenitis in rabbits?
A

a. Hyperkeratosis, follicular keratosis, follicular dystrophy
b. Perifollicular fibrosis and lymphocytic infiltrate effacing the sebaceous glands

65
Q
  1. Contrast the clinical signs of Trixacarus caviae and Chirodiscoides caviae in guinea pigs.
A

a. T. caviae = burrowing sarcoptic mite causing intense pruritus with self mutilation, brittle/easily epilated hair, anorexia of the ventral abdomen, neck, and shoulders

b. C. caviae = fur mite causing rare pruritus and alopecia of flanks and perineum

66
Q
  1. What is the most common chewing louse in guinea pigs?
A

a. Gliricola porcelli (the slender guinea pig louse)

67
Q
  1. What are the sucking lice in guinea pigs?
A

a. Trimenopen jenningsi and T. hispidum

68
Q
  1. What is the most common ringworm infection in guinea pigs?
A

a. Trichophyton mentagrophytes

69
Q
  1. What is the main clinical sign of poxvirus infection in guinea pigs?
A

a. Cheilitis

70
Q
  1. A guinea pig presents with cutaneous hemorrhage, delayed wound healing, and a rough haircoat. What is your primary differential and how does this develop in guinea pigs?
A

a. Vitamin C deficiency (Scurvy)
b. Guinea pigs lack L-gulonolactone oxidase enzyme, which synthesizes Vitamin C (used in collagen synthesis and integument) so vitamin C must be supplemented in guinea pigs

71
Q
  1. True/False – Cyprinid herpesvirus 1 can cause white, raised cutaneous nodules and mucoid plaques on the head and fins of carp.
A

a. True – it can cause papillomas that subsequently transform to cutaneous squamous cell carcinoma

72
Q
  1. What are two potential negative effects of skin disease in bats specifically, compared to other species?
A

a. Decreased echolocation if ear flaps are affected
b. Inability to fly if wing membranes are affected

73
Q
  1. What are the four most common antibiotics used in alpacas?
A

a. Procaine penicillin
b. Ceftiofur
c. Oxytetracycline
d. Enrofloxacin

74
Q
  1. A 3 yo, female intact guinea pig presents with bilateral symmetrical alopecia of the flanks and back. What is your primary differential and how is this treated?
A

Answer = ovarian cysts, treated by spaying

75
Q
  1. A guinea pig presents with matted fur under the chin. What is your first step in physical examination and how is this treated?
A

a. Physical examination = examine teeth for abnormalities
b. Treatment = correct dental abnormalities, clean affected area, topical antibiotics in case of secondary infection

76
Q
  1. What is the etiology of mucocutaneous fibropapillomas in alpacas?
A

a. Camelid papillomavirus, similar to BPV1

77
Q
  1. What is a predator avoidance mechanism in chinchillas?
A

a. Fur slip – spontaneous epilation of fur clumps when the coat is grabbed too roughly. Takes 4 – 6 months to regrow

78
Q
  1. A chinchilla develops paraphimosis. What should you check for on physical examination?
A

a. A fur ring, which wraps around the prepuce to cause paraphimosis

79
Q
  1. What is the sarcoptic mite in rats?
A

a. Notoedres muris

80
Q
  1. What are the two most common bacterial causes of abscesses on the face of alpacas? Is either zoonotic?
A

a. Corynebacterium pseudotuberculosis – zoonotic
b. Actinomyces spp. in tooth root abscess

81
Q
  1. What is the fur mite in rats and what signs does it cause?
A

a. Radfordia ensifera – self trauma to head and shoulders

82
Q
  1. What is the causative agent of knemidocoptiasis in birds?
A

a. Knemidocoptes mites, similar to sarcoptic dermatitis in mammals but lacking the intense pruritus seen in scabies

83
Q
  1. What is the sucking louse of rats? What two diseases can it be a vector for?
A

a. Polyplax spinulosa
b. Vectors = typhus and hemobartonellosis

84
Q
  1. A rat develops red staining of the paws and face. What is the etiology of this condition?
A

a. Coronavirus causes sialodacryoadenitis = red tears and self trauma due to porphyrin irritation on the face and paws

85
Q
  1. What is the most common mammary tumor in the rat?
A

a. Fibroadenoma (benign)

86
Q
  1. What is the name of this condition in rats? What is its cause?
A

Answer = sialodacryoadenitis, caused by a coronavirus

87
Q
  1. What is the problem with feeding old commercial guinea pig feed?
A

a. The Vitamin C in the feed degrades after 3 months, which can lead to vitamin C deficiency in the guinea pig

88
Q
  1. What are signs of mercury poisoning in tortoises and mammals (skin and systemic)?
A

a. Tortoise = peripheral neuropathy, skin discoloration/swelling/desquamation

b. Mammals:
i. Cutaneous = eczema, skin keratinization, non-healing ulcers
ii. Systemic = anuria, polydipsia, hematuria, melena
iii. Neurologic = CNS depression/excitation, blindness, ataxia, incoordination, tremors, abnormal behavior, hypermetria, nystagmus (cats), tonic-clonic convulsions

89
Q
  1. A 9 day old rat presents with ringtail. What are four risk factors for the development of this condition?
A

a. Low humidity
b. Dehydration
c. Deficiency in essential fatty acids
d. Elevated temperature

90
Q
  1. What is the etiology of zinc responsive dermatitis in alpacas?
A

a. Breeding females (especially those with dark coats – due to tyrosinase requirement) with not enough zinc mineral content in the diet

91
Q
  1. A 3 yo, female intact guinea pig presents with bilateral symmetrical alopecia of the flanks and back. How would you treat this patient? (multiple choice)
    a. Ovariohysterectomy
    b. Vitamin C supplementation
    c. Enrofloxacin
    d. Correction of dental abnormalities
    e. Selamectin
A

a. Ovariohysterectomy

92
Q
  1. A 1-year-old indoor/outdoor Lionhead rabbit presents with a 2-week history of lethargy, anorexia, bilateral blepharoconjunctivitis, and numerous focal to coalescing cutaneous tumors on the face and perineum. The rabbit is fed a balanced diet and receives no ectoparasite control. A biopsy of the cutaneous tumors reveals undifferentiated mesenchymal cells surrounded by a mucinous matrix, endothelial cell proliferation, and intracytoplasmic inclusions in various cell types. What virus is responsible for the disease you suspect that this rabbit has? (multiple choice)
    a. Myoxoma virus
    b. Rabbit fibroma virus
    c. Shope papilloma virus
    d. Rabbit pox virus
A

a. Myoxoma virus

93
Q
  1. How is this condition treated in rats?
A

Condition = ringtail (avascular necrosis of the tail)
Treatment = tail amputation proximal to the constriction, correct husbandry and dietary deficiency to prevent recurrence

94
Q
  1. What is the common demodex mite in gerbils?
A

a. Demodex merioni

95
Q

What are the common demodex mites in hamsters?

A

D. aurati = long bodied
D. criceti = short bodied

96
Q
  1. A gerbil presents with moist dermatitis on the nose and around the eyes with secondary self trauma and bacterial infections. What is the likely cause and how is it diagnosed?
A

a. Cause = increased porphyrin secretion from the Harderian gland due to stress – the secretion causes irritation
b. Diagnosis = Woods lamp shows porphyrin fluorescence

97
Q
  1. What is the causative agent of beak and feather disease?
A

a. Circovirus, (beak and feather disease virus) – a single stranded, circular DNA, non enveloped virus

98
Q
  1. List 5 functions of self-grooming in wild animals.
A

a. Hygiene
b. Removal of dirt and parasites
c. Chemocommunication
d. Thermoregulation
e. Antibacterial
f. De-arousal

99
Q
  1. What is the difference between tail slip in gerbils and tail slip in chinchillas?
A

a. In gerbils, it is a degloving injury caused by restraint through grasping the tail – amputation is required
b. In chinchillas, it is a predator escape mechanism where only the hair is shed and it will regrow in 4 – 6 months

100
Q
  1. What are the two scabies mites in hamsters?
A

a. Notoedres notoedres and N. cati

101
Q
  1. What are the clinical signs of scabies mites in hamsters?
A

a. Intense pruritus, self mutilation, alopecia, erythematous and papilloma-like crusting on the limbs, nose, pinna and genital area

102
Q
  1. A Syrian hamster develops papillomatous lesions on the face and perineum (cutaneous epitheliomas). What is the likely cause?
A

a. Hamster polyomavirus

103
Q
  1. What is the most common ectoparasite in mice?
A

a. Myocoptes musculinus

104
Q
  1. What color of mouse is susceptible to hypersensitivity reactions to Myobia musculi?
A

a. Black mice

105
Q
  1. What is the most common skin disease reported in alpacas?
A

a. Ectoparasites – Sarcoptes scabiei, Psoroptes, Chorioptes bovis, Pediculosis

106
Q
  1. What is your primary differential for this biopsy from a koala with crusted, fissured lesions on the face?
A

a. Cutaneous, intracorneal mite that forms tunnels through the stratum corneum (sarcoptic mange)

107
Q
  1. What is the most common ectoparasite of guinea pigs? (multiple choice)
    a. Cheyletiella parasitovorax
    b. Trixicarus caviae
    c. Gliricola porcelli
    d. Trimenopen jenningsi
    e. Chirodiscoides caviae
A

b. Trixicarus caviae

108
Q
  1. Describe the clinical signs and treatment for Myobia musculi infestation in mice.
A

a. Signs = often asymptomatic unless hypersensitivity reaction occurs (esp. in black mice)
i. Alopecia, scaling, erythema with pruritus and self-mutilation on the head, neck, shoulders
b. Often present concurrent with Myocoptes musculinus infection
c. Treatment = injectable ivermectin, permethrin powder on the mouse and bedding

109
Q
  1. What ectoparasite in mice can be a vector for tularemia?
A

a. Polyplex serrate, a sucking louse

110
Q
  1. What type of mite causes alopecia with white nodules and comedones in mice?
A

a. Psoregates simplex, a follicular mite

111
Q
  1. What are the two types of Caparinia mites in hedgehogs? What animals do they infect?
A

a. Caparinia tripilis = infect pets
b. Caparinia erinacei = infect wildlife

112
Q
  1. What are four possible causes for vesicular dermatitis in reptiles?
A

a. Being housed in moist, dirty environments
b. Chemical burns
c. Being housed with cedar chips or shavings (topical reaction)
d. Topical Salmonella infection

113
Q
  1. What is the (1) common type of ringworm in hedgehogs?
A

a. Trichophyton erinacei

114
Q
  1. How long does the skin take to heal in a reptile on average? (multiple choice)
    a. 3 weeks
    b. 4 weeks
    c. 6 weeks
    d. 10 week
A

c. 6 weeks

115
Q
  1. What is the host-specific sucking louse in prairie dogs?
A

a. Linognathus cynomys

116
Q
  1. What is the most common ectoparasite of guinea pigs? How do affected guinea pigs usually present with this infestation?
A

a. Trixicarus caviae (burrowing sarcoptic mite)
b. Intense pruritus with excoriations, alopecia, and brittle hairshafts mainly on the ventral abdomen, neck, and shoulders

117
Q
  1. What is the most common injury in sugar gliders?
A

a. Self mutilation of the scrotum, feet, and surgical sites

118
Q
  1. A 3 year old, female intact guinea pig presents with bilaterally symmetric alopecia over the flanks and back. What do you expect to find on ultrasound and how do you treat it?
A

a. Ovarian cysts can be seen on AUS
b. Treatment = ovariohysterectomy is definitive treatment

119
Q
  1. When is the skin metabolically active in a reptile?
A

a. Only during ecdysis (shedding)

120
Q
  1. What is the most common etiology for shell ulcers in chelonians? How are they treated?
A

a. Most common etiology = inadequate husbandry
b. Common treatment = restriction from water for most of day, debridement to remove necrotic material, other sealant/repair options

121
Q
  1. What are the clinical signs of this mite in the hedgehog?
A

Answer: Caparinia tripilis
a. Severe pruritus
b. Dry, scaling skin
c. Lichenification of the pinnal margins
d. Failure to roll up, causing stress, hypothermia, and loss of nocturnal behavior

122
Q
  1. Give four differentials for these findings in a hedgehog.
A

Answer:
a. Trichophyton erinacei infection
b. Caparinia tripilis infection
c. Demodicosis
d. Notoedres

123
Q
  1. Subcutaneous abscesses are very common in rabbits, usually resulting from entry of bacteria via skin wounds, or secondary to bacteriemia. Which of the following is true regarding rabbit abscesses? (multiple choice)
    a. Rupture, fistula formation, and drainage often occur
    b. Rabbit abscesses have a thick capsule and contain a thick caseous exudate
    c. Pasteurella multocida and S. pseudintermedius are common isolates from rabbit abscesses
    d. Treatment of choice is routine lancing and drainage
A

b. Rabbit abscesses have a thick capsule and contain a thick caseous exudate

124
Q
  1. A guinea pig presents with cutaneous hemorrhage, delayed wound healing, and a rough haircoat. What disease do you suspect? (multiple choice)
    a. Trixacarus caviae infestation
    b. Vitamin C deficiency (Scurvy)
    c. Cystic ovaries
    d. Trichophyton mentagrophytes infection
    e. Pemphigus foliaceus
A

Answer: B (L-gulonolactone is minimally functional)

125
Q
  1. Which of the following statements is true regarding infestation on this mite in domestic rabbits? (multiple choice)
    a. It is a burrowing ear mite and is the most common ectoparasite of the rabbit
    b. The life cycle is completed in less than 3 weeks, and the mites can survive off the host for 6 to 41 days
    c. Adult mites are saddle shaped, with inward curving claws, hook-like mouthparts, and short hairlike setae at the distal end of their limbs.
    d. The dermatitis and pruritus associated with infestation appears to be related with hypersensitivity to the mite’s antigens in the saliva and feces
    e. Healthy rabbits with subclinical disease may carry high-grade infestations for months to years and present only very mild pruritus
A

Answer: d
d. The dermatitis and pruritus associated with infestation appears to be related with hypersensitivity to the mite’s antigens in the saliva and feces
(this is a Psoroptes cuniculi mite)

126
Q
  1. A household of six indoor-only mini Rex rabbits, ranging from 5 to 14 months of age, present with a two month history of progressive scaly, dry, erythematous dermatitis with patchy alopecia over the dorsal neck, trunk, hind end, and abdomen. Two of the rabbits are pruritic with evidence of barbering. The cat in the household is also pruritic. A DTM/PCR was negative. What is the most likely diagnosis? (multiple choice)
    a. Psoroptes cuniculi
    b. Spilopsyllus cuniculi
    c. Sarcoptes scabiei
    d. Cheyletiella parasitovorax
A

d. Cheyletiella parasitovorax

127
Q
  1. What nutrient must be supplemented in guinea pigs because they lack L-gulunolactone oxidase? (multiple choice)
    a. Vitamin A
    b. Vitamin B
    c. Vitamin C
    d. Vitamin D
    e. Vitamin E
A

c. Vitamin C

128
Q
  1. What type of parasite is this in a guinea pig?
A

Answer: Trixicarus caviae

Exotic Animal Dermatology (1 decks)

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