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Fall 22: Parasites > 17. mites > Flashcards

17. mites Flashcards

1
Q

— are microscopic ectoparsites

A

mites

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2
Q

what do mites feed on

A

blood, skin debris, lymph and sebaceous secretions

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3
Q

how are mites transmitted

A

direct prolonged contact

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4
Q

what are some symptoms of mites

A

dermatitis- mange
loss of blood and tissue
allergic reaction
vectors or intermediate hosts ( Anoplocephala, Monezia, Stilesia)

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5
Q

how do mites breathe

A

gas exchange by integument or stigmata

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6
Q

life cycle of a mite

A

3 nymph stages
all stages are on the host

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7
Q

4 types of burrowing mites

A

Sarcoptes
Notoedres
Knemidocoptes
Demodex

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8
Q
A

demodex

cigar shaped body
8 stumpy legs
striations on the abdomen

burrowing mite

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9
Q

Demodex folliculorum infect

A

humans

burrowing mite

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10
Q

Demodex phylloides infect

A

pigs

burrowing mites

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11
Q

where do demodex live

A

hair follicles and sebaceous glands

head downward

burrowing mites

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12
Q

symptoms of demodex

A

NOT itchy

localized:
paws and face with dry scales, mild alopecia and lesions

generalized:
dry/squamous- all over body thickened and crusty with marked alpopecia

wet/purulent/follicular- all over skin thickened, excoriated and red, marked alopecia, 2ndary bacterial infection- euthanasia

burrowing mite

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13
Q

red mange is caused by

A

demodex

burrowing mites

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14
Q

what does demodex look like

A

cigar shaped
8 legs
striation on the body

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15
Q

2 types of generalized demodecosis

A

dry/squamous- all over body thickened and crusty with marked alpopecia

wet/purulent/follicular- all over skin thickened, excoriated and red, marked alopecia, 2ndary bacterial infection- euthanasia

demodex- burrowing mites

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16
Q
A

Sarcoptes

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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17
Q

what causes scabies

A

Sarcoptes scabiei var.

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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18
Q

what does sarcoptes look like

A

short mouth
no eyes or stigmata
circular
stubby legs, 3th and 4th pair can’t be seen from the top
triangular scales in rows
1st two pair of pretarsi bears terminal suckers

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19
Q

on sarcoptes 1st pair of pretarsi are

A

terminal suckers

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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20
Q

life cycle of Sarcoptes

A

14-21 days

females lay eggs in burrow(moulting pocket)- only one female per burrow

mating at surface

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21
Q

symptoms of Sarcoptes

A

itchy
skin lesions around head and ears
spread during suckling or mating
redness, alopecia
skin thickening
secondary infections
anorexia, blindness, impaired hearing

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

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22
Q

Notoedres infect

A

N. cati- cats
N cati var. cuniculi- rabbits

23
Q

what does Notoedres look like

A

Like Sarcoptes except striations are thumb print

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

24
Q
A

notoedres

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

25
Q

life cycle of notoedres

A

similar to sarcoptes except there can be more than one female in the burrow

burrow called a nest

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

26
Q

burrow for a Notodres is called —
burrow for a Sarcoptes is called —

A

molting pocket- only one female

nest- many females

27
Q

symptoms of Notoedres

A

skin lesions and itchiness

similar to sarcoptes

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

28
Q

what animals are infected by Knemidocoptes

A

birds

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

29
Q

symptoms of Knemidocoptes

A

K. mutans- scaly legs
K. pilae- scaly face
K. gallinarum- depluming itch

burrowing mite (Sarcoptes, Notoedres, Knemidocoptes, Demodex)

30
Q

what does Knemidocoptes look like

A

Sarcoptes except for no triangular scales

31
Q
A

Psoroptes

non burrowing mite

32
Q

what does Psoroptes look like?

A

oval
long legs
pointed mouthparts
3 jointed pretarsi with funnel shaped pedicels

33
Q

Psoroptes cuniculi infect

34
Q

Psoroptes infect

A

mammals

P. ovis- sheep scab
P. cuniculi- ear mites

35
Q

clinical signs of Psoroptes infection

A

inflammation, exudation in ears, yellow crust and scab formation
wool drop
intense itching
weight loss, restlessness and secondary infections

non burrowing mites

36
Q
A

Psoroptes ovis

non burrowing mites

37
Q

— are ear mites with cup shaped pedicle

A

Otodectes cynotis

38
Q

— have cup shaped pedicels

A

Otodectes cynotis- ear mites

non burrowing mites

39
Q

Otodectes cynotis infect

A

cats, dogs and other small mammals

usually ears but can spread

40
Q

symptoms of Otodectes cynotis

A

asymptomatic or severe ear infection
waxy exudate
itchiness that leads to head shaking

41
Q

— are fur mites

A

Cheyletiella

non-burrowing mites

42
Q

cheyletiella infect

A

rabbits, small mammals and human

non-burrowing mites

43
Q
A

Cheyletiella
fur mites

rabbits and humans

44
Q

Cheyletiella have —-

A

palp bear claws
pedicels are comb like

45
Q

Cheyletiella blackei commonly affects the face of

A

cats

cause itchiness and skin shedding- walking dandruff

46
Q

walking dandruff on cats is caused by

A

Cheyletiella blackei
fur mite- non burrowing

47
Q

sheep itch mite is caused by

A

psorergates ovis

crude star look
nonburrowing mite

48
Q

Psorergates ovis looks like

A

star like- legs are evenly spaced

sheep itch mite- non burrowing

mites bite at fleece- lose patches

49
Q
A

the red mite- poultry mite
dermanyssus gallinae

feeds on blood and becomes red or black when engorged

spider-like, lair ectoparasite

cause irritation, anemia, decreased egg production and death

50
Q

Dermanyssus gallinae

A

the red mite
dermanyssus gallinae

feeds on blood and becomes red or black when engorged

spider-like, lair ectoparasite

cause irritation, anemia, decreased egg production and death

51
Q

diagnosis of mange is by

A

skin scraping that shows mites

52
Q

K. mutans-

A

scaly legs

Knemidocoptes burrowing mite of birds

53
Q

K. pilae-

A

scaly face

Knemidocoptes burrowing mite of birds

54
Q

K. gallinarum-

A

depluming itch

Knemidocoptes burrowing mite of birds

Fall 22: Parasites (32 decks)

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