Mites

Question 1

Name at least 7 surface mites

Answer 1

Psoroptes
Chorioptes
Otodectes cynotis
Cheytiella
Trombicula
Dermanyssus
Ornithonyssus
Chirodiscoides
Listrophorus

Question 2

Fur mites

Answer 2

Chirodiscoides (guinea pig) and Listrophorus (rabbit). Found on hairs ather than skin. Few signs in GPs.
Spread by direct contact bedding, hair, debris

Question 3

Ornithonyssus

Answer 3

Northern fowl mite. surface.

Blood feeder. Causes matting, scabbing, decreased production, anaemia, infection…
look grey-black on feathers.

Question 4

Dermanyssus gallinae

Answer 4

Chicken red mite. Surface

Major parasite. Live off the bird but then takes blood meal at night.
Condition loss, decreased production, anaemia

Question 5

Cheytiella

Answer 5

Surface.
largely free living, often predatory.
yarsurgi, blakei and parasitivorax (dog, cat, rabbit)

scaling, pruritus, can be more severe if already ill. ‘Walking dandruff’
characteristic waist and large palps.

Question 6

Trombicula

Answer 6

Chigger/harvest mites, surface
free living. only the larvae are parasitic. Bright red-orange, 0.2mm larvae.
ground living so affect legs, belly, face/head of grazers. Hypersensitivity to bites causes pruritus, erythema, scratching.

Question 7

Otodectes cynotis

Answer 7

Ear mites in carnivores. surface.

Very common, often subclinical.
Head shaking, ear scratching. Can cause severe irritation and secondary infections. Diagnosis- see mite with otoscope, or microscopy (swab the characteristic black crusty wax)

Question 8

Chorioptes

Answer 8

Most common cause of mange in cattle and horses. Irritant. loss of production

Question 9

Psoroptes

Answer 9

ovis, equi, cuniculi..
sheep scab, rabbit ear mites. often very irritant- rubbing trauma…worse than Chorioptes.

segmented pretarsus with funnel shaped sucker

Question 10

Name 5 burrowing mites

Answer 10

Sarcoptes, Trixacarus caviae, Notoedres cati, Knemidocoptes, Demodex

Question 11

Sarcoptes scabei

Answer 11

One species, multiple strains. zoonotic. highly contagious. intense pruritus.
females burrow into skin and form tunnels, where they lay eggs.
terminal anus

Question 12

How are burrowing mites often identified?

Answer 12

Anus. eg sarcoptes- terminal
Trixacars/Notoedres- dorsal
Knemidocoptes- ventral

demodex is cigar shaped with stumpy legs

Question 13

Knemidocoptes

Answer 13

scaly face/foot/tassel foot in birds. highly contagious. inflammation and crusting, lameness….