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VM638: Parasitology > Dogs & Cats: Mites (Exam 2) > Flashcards

Dogs & Cats: Mites (Exam 2) Flashcards

1
Q

What is the general morphology of mites?

A

Stock/pedicle connecting sucker to leg (can be long or short, can be jointed)

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2
Q

What are the general life stages of mites?

A

Eggs –> larva –> nymph –> adult

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3
Q

Is Cheyletiella spp. burrowing or non-burrowing?

A

Non-burrowing

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4
Q

What does Cheyletiella spp. feed on?

A

Keratin of epidermis

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5
Q

What is the predilection site of Cheyletiella spp.?

A

Dorsum

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6
Q

How is Cheyletiella spp. transmitted?

A

Direct contact
Uncommon, may be seen in puppies in large breeding facilities

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7
Q

What are the clinical signs of Cheyletiella spp.?

A

Red/yellow crusts
Exfoliative dermatitis
“Walking dandruff”

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8
Q

Why might Cheyletiella spp. be seen on fecal flotations?

A

Ingested on fur, then passed in feces

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9
Q

What are the hosts of Sarcoptes scabei?

A

Dogs, wild canids, etc.

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10
Q

Is Sarcoptes scabei burrowing or non-burrowing?

A

Live in burrows within skin

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11
Q

What is the life cycle of Sarcoptes scabei?

A

Life cycle completed in 2-3 weeks
Does not survive well in environment (closely associated with host)

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12
Q

What is the morphology of Sarcoptes scabei?

A

Long, unsegmented pedicles
Round, no claws

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13
Q

What are the clinical signs associated with Sarcoptes scabei?

A

Hyperkeratosis and alopecia
Pruritis

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14
Q

What is the predilection site of Sarcoptes scabei?

A

Ears, lateral elbows, lateral hocks
Flanks and ventrum

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15
Q

What is the predilection site of Demodex spp.?

A

Often considered normal fauna, but can represent an overgrowth
In hair follicles and sebaceous gland ducts

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16
Q

How is Demodex spp. transmitted?

A

Direct contact

17
Q

What are the clinical signs of Demodex spp.?

A

Localized form: mild, often nonpruritic, on head or limbs
Generalized: may be due to overgrowth and/or underlying disease or weakened immune response, alopecia

18
Q

How is Demodex spp. diagnosed?

A

Deep skin scrapes necessary
Can resolve spontaneously

19
Q

What is the phylogenetic classification of mites?

A

Arachnida

VM638: Parasitology (22 decks)

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