Mites

Question 1

Describe the anatomy of a mite

Answer 1

• Body has 2 sections not 3
• Head part= Gnathosoma
• Body= Idiosoma

Question 2

What is the name for a mite infestation?

Answer 2

-Acariasis

Question 3

What is severe acriasisis called?

Answer 3

Mange

Question 4

What is the name for a cat/ dog ear mite?

Answer 4

Otodectes cynotis (surface)

Question 5

What are the indirect vs direct effects of mites?

Answer 5

Direct epidermal damage (skin erythema, pruritus, scale formation, lichenification)
-Loss of blood
Indirect effects= mechanical transmission or biological transmission of pathogens

Question 6

What mite causes sheep scab?

Answer 6

• Psoroptes (P.ovis)

- Surface mite

Question 7

What impact does chorioptes bovis have?

Answer 7

• Surface mite in cattle)
• Common cause of mange in cattle/ horses
• Causing irritation

Question 8

What is ‘walking dandruff’?

Answer 8

Can be caused by Cheyletiella

-The mites walking amongst the debris looks like walking dandruff

Question 9

What’s the name for chigger mites?

Answer 9

• Trombicula (surface)
• Only the larvae are parasitic
• Large and bright red to orange mites

Question 10

What are Dermanyssus?

Answer 10

Chicken red mites

-Mites live off the bird and jump on to take blood meal at night.

Question 11

What is the proper name for the Northern fowl mite?

Answer 11

• Onrithonyssus
• Surface mite
• Primarily stays on the host for entire life cyle
• Grey black appearance on feathers

Question 12

Describe Sarcoptes scabei

Answer 12

• Zoonotic burrowing mite
• Highly contagious
• Cause very intense pruritus largely due to hypersensitivity to faecal material
• Diagnosed by DEEP skin scrapings

Question 13

Name a burrowing mite that affects guinea pigs

Answer 13

-Trixacarus caviae

Question 14

What is Notoedres cati?

Answer 14

A burrowing mite found mainly in cats

-Especially affects skin on head and around ears

Question 15

What causes scaly face, scaly foot and tassel foot?

Answer 15

Knemidocoptes
It is a disease found in birds
Is highly contagious

Question 16

Describe demodex mites

Answer 16

• Burrowing mites
• Live head down in hair follicles & sebaceous glands
• Often secondary to staphylococcal pyoderma
• Can have localised or generalised demodicosis

Question 17

Describe control of mites

Answer 17

-Organophosphates
-Avermectins
-Lime sulphur
For the enrvironmental treatment of poultry mites= organophosphates and lime sulphur