9- Ectoparasitic causes of skin disease

Question 1

List 3 reasons why ectoparasites are of clinical importance

Answer 1

Vectors of disease
Direct impact on host-pruritus
Predisposes other diseases - secondary bacterial inf.
Act as pointers to underlying diseases - immunocompromised

Question 2

Where do lesions of a flea infestation manifest on a dogs body

Answer 2

Caudal/ dorsal part of body

Question 3

What are the 4 cutaneous reaction patterns in cats?

Answer 3

Head/ neck pruritus
Symmetrical alopecia
Eosinophil granuloma complex
Miliary dermatitis

Question 4

Name a common surface mite seen on cattle

Answer 4

Chorioptes bovis- surface mite

Question 5

Which surface mite causes sheep scab

Answer 5

Psorptes ovis

Question 6

Name the ear mite of dogs

Answer 6

Otodectes

Question 7

Name 2 clinical signs burrowing mites cause

Answer 7

Pruritus
Alopecia
Hyperkeratosis
Crust

Question 8

Name a common surface mite seen on horse

Answer 8

Chorioptes equi- leg/ tail mange

Question 9

What cases sweet itch in horses

Answer 9

Midges (e.g. Culicoides spp) –>Hypersensitivity - pruritic lesions along crest of neck, tail base, face

Question 10

Where do demodectic mites live?

Answer 10

Hair follicles

Question 11

what causes scrotal mange in sheep

Answer 11

chorioptes bovis- surface mite

Question 12

what does trixacarus infect and what does it cause

Answer 12

guinea pig
is a burrowing mite
causes extreme pruritus can lead to seizures and death

Question 13

in what species id demodex most commonly seen in

Answer 13

dog, hamster and occasionally cat
associated with underling immunocompromise

Question 14

what does cutaneous myiasis cause and which species does if generally affect

Answer 14

blowfly strike - potentially fatal
sheep and rabbits