Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

RUSVM Parasitology > Exam II - Order Acari - Mites > Flashcards

Exam II - Order Acari - Mites Flashcards

1
Q

Describe the different strategies utilized by Order Acari

A
  • Burrow into the host epidermis (Sarcoptes)
  • Non-burrowing, entirely on skin surface (Cheyletiella, Chorioptes)
  • Restricted to an area of the body (Otodectes)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the common name for Sarcoptes scabiei?

A

Sarcoptic mane mite, itch mite, scabies mite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the scientific name for the Sarcoptic Mange Mite?

A

Sarcoptes scabiei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is/are the host(s) for Sarcoptes scabiei?

A

All domestic animals and humans.

It is rare in cats

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe the appearance of the Sarcoptes scabiei adult

A

round, 500 um diameter, short legs, suckers on long unsegmented stalks differ between sexes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How many weeks can Sarcoptes scabiei live on the surface of the skin?

A

Trick question! Sarcoptes scabiei is a burrowing mite. It can NOT live on the surface of the skin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the PPP for Sarcoptes scabiei?

A

2-3 weeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe the life cycle of Sarcoptes scabiei

A

Fertilized female tunnels in upper layers of epidermis, feeding on damaged tissue. Eggs are laid in tunnels & hatch in 3-5 days to larvae that crawil on skin surface.

Larvae burrow and form molting pockets where nymphs and adults develop.

All stages tunnel in the epidermis, resurface, and burrow again. Adult male emerges and seeks female. After fertilization, the process starts over.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where do Sarcoptes scabiei nymphs and adults develop?

A

**molting pockets **in the host’s skin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is/are the site(s) of infection for Sarcoptes scabiei?

A

Skin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Describe any pathogenesis associated with Sarcoptes scabiei

A

Erythema, scale and crust formation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe some clinical signs associated with Sarcoptes scabiei

A

Begins on hairless areas of body (lateral elbow & pinna of the ear are common starting places)

Lesions of follicular papules, erythema, crusts of dried serum and blood, and pruritus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How would you diagnose Sarcoptes scabiei?

A

Skin scraping, but recovery of the mite is difficult

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe treatment and prevention options for Sarcoptes scabiei

A

MCLs are effective, treatment of pets cure the humans they infest.

This is very contagious, so treat all of the animals in the household

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the common name for Demodex canis?

A

Demodectic mange mite, follicle mite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is/are the host(s) for Demodex canis?

A

Dogs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Describe the appearance of the Demodex canis adult

A

Cigar with Legs

Adults have elongate tapering body, 400 um, 4 pairs of stumpy leggs on anterior

18
Q

Describe the life cycle of Demodex canis

A

Entirely in hair follicles and sebaceous glands. Mites are normal fauna of skin. Adults in follicles lay eggs, larvae and nymphs at mouth of follicle. Egg to adult in 2-4 weeks.

Transmission to newborn pups is from bitch to pup by direct contact during nursing in first 2-3 days postpartum

19
Q

What is/are the site(s) of infection for Demodex canis?

A

Hair follicles and sebaceous glands

20
Q

Describe any pathogenesis associated with Demodex canis

A

The presence of small numbers of mites is normal.

In larger numbers of mites, we may see localized demodicosis associated with alopecia, erythema and no pruritis.

Prognosis for recovery is excellent

21
Q

What is the first clinical sign you will notice in localized demodicosis?

A

alopecia

22
Q

How would you diagnose Demodex canis?

A

Skin scrapings can revel the mite, BUT presence does not necessarily indicate disease since these are normal inhabitants of the dog

23
Q

Describe generalized demodicosis

A

characterized by 5 more more areas of localized disease or entire body region, hair sparse and skin coarse and dry, develops to “red mange”.

Concomitant staphylococcal pyoderma develops, pustules develop, open, and ooze. Very difficult to cure

24
Q

Describe treatment & prevention options for generalized demodicosis

A

Amitraz (formamidine) is approved

25
Q

What is the common name for Cheyletiella yasguri?

A

Walking dandruff

26
Q

Who is/are the host(s) for Cheyletiella yasguri?

A

dogs, humans

27
Q

Describe the appearance of the Cheyletiella yasguri adult

A

Body has a “waist”, legs long, 500 um. Called “walking dandruff because large enough to be seen walking against a dark background, prominent palpal claws

28
Q

What is/are the site(s) of infection for Cheyletiella yasguri?

A

Fur and hair

29
Q

Describe the life cycle of Cheyletiella yasguri

A

Mites live on skin, hair and tunnel in epidermis debris. Mites feed on debris. Eggs attached to hair. Transmission is by direct contact. Life cycle is completed in 2 weeks.

30
Q

How would you diagnose Cheyletiella yasguri?

A

dandruff. Exam of an adhesive tape swap may reveal mites also

31
Q

What are the treatment options for Cheyletiella yasguri?

A

insecticides

32
Q

What is the scientific name for “walking dandruff”

A

Cheyletiella yasguri

33
Q

What is the common name for Otodectes cynotis?

A

ear mite

34
Q

What is/are the host(s) for Otodectes cynotis?

A

Dogs, cats, ferrets, & foxes

35
Q

Describe the appearance of the Otodectes cynotis adult

A

500 um in length. Long legs extending beyond body margin, suckers of males and females differ, copious dark cerumen is observed.

Here are two now… having sex:

36
Q

What is/are the site(s) of infection for Otodectes cynotis?

A

Ears.

37
Q

Describe any pathogenesis associated with Otodectes cynotis

A

In cats: dry, waxy parchment-like material in ears with large numbers of mites. Can lead to secondary infections resulting in external ear inflammation (otitis externa)

38
Q

What clinical sign should you look for with Otodectes cynotis

A

frequent shaking of head

39
Q

How would you diagnose Otodectes cynotis?

A

Behavior of the animal, exudate in ear canal, mites on slide

40
Q

What are some treatment options for Otodectes cynotis?

A

Ivermectin otic suspensions, revolution, and other compounds are approved

RUSVM Parasitology (124 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions