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Animal Disease 1 > Mites > Flashcards

Mites Flashcards

1
Q

Outline the basic steps of the 2 mite lifecycles.

A

Egg > larva > protonymph > deutonymph > tritonymph > adult

Egg > larva > protonymph > tritonymph > adult

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2
Q

What is the appearance of the scabies mite?

A

Round bodies
Short legs
Long straight pedicles

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3
Q

How can the scabies mite be identified?

A

Adult females in stratum corneum

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4
Q

What is caused by the scabies mite?

A

Sarcoptic mange. Zoonotic. Common in dogs and pigs at pineal margins and external ear canals.

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5
Q

What is the scaroptiform mites scientific name?

A

Trixacarus caviae

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6
Q

How can the scaroptiform mite be differentiated from the scabies mite?

A

Different anus position then scabies mite

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7
Q

Which animal is the scaroptiform mite common in?

A

Guinea pigs

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8
Q

What is the appearance of knemidocoptes gallinae?

A

Round with short legs

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9
Q

Which animal is knemidocoptes gallinae common in?

A

Birds

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10
Q

What does knemidocoptes gallinae cause?

A

Feather loss and scale

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11
Q

What does the knemidocoptes mutans mite cause and in what animal?

A

Scaly leg in backyard chickens

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12
Q

What are the clinical signs of scaly leg due to the knemidocoptes mutans mite?

A

Thickening of the skin
Loss of feathers
Scaling

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13
Q

What is the appearance of psoroptes ovis?

A
  • Long legs
  • Funnel shaped suckers
  • 3 jointed pedicel
  • Pointed mouthparts
  • Rounded abdominal tubercles in male
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14
Q

What does psoroptes ovis cause?

A

Sheep scab, severe pruritis

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15
Q

What animals does psoroptes ovis affect?

A

Sheep and can affect cattle, but mites do not pass between sheep and cattle.

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16
Q

Why is psoroptes ovis hard to eradicate?

A

Can survive off host for 2 weeks

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17
Q

How can sheep scab be controlled?

A

Dips
Inject macrocyclic lactones
Quarantine new

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18
Q

What is the appearance of chorioptes bovis?

A
  • Long legs
  • Short unjointed pedicles
  • Cup shaped pedicles
  • Rounded mouthparts
  • Truncate abdominal tubercles in male
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19
Q

Which animals does chorioptes bovis affect?

A

Commonly cattle
Horses

20
Q

Why is chorioptes bovis difficult to eradicate?

A

Survives 3 weeks off host

21
Q

How is chorioptes bovis different to psoroptes ovis?

A

Less pathogenic

22
Q

Where are chorioptes located on the animal?

A

Lower legs
Base of tail peritoneum
Udder
Scrotum

23
Q

What is the appearance of otodectes cynotis?

A

Long legs
Relatively large
No joined pretarsi

24
Q

How can otodectes cynotis be distinguished from psoroptes ovis?

A

Smaller than psoroptes ovis

25
Q

Which animals are affected and at which site by otodectes cynotis?

A

Cats and dogs
Around ear

26
Q

Which mite causes demodicosis?

A

Demodex canis (also called demodex injar in dogs)

27
Q

What is the appearance of demodex canis?

A

Small
Elongated
Cigar shaped

28
Q

How can demodex canis pass to young?

A

Suckling

29
Q

How is demodectic mange diagnosed?

A

Skin scrapes
Hair plucks
Skin biopsies

30
Q

What is the appearance of cheyletielldae?

A

Large
Curved palpal claws
Genu on first legs

31
Q

Which animals are affected by cheyletielldae?

A

Rabbits
Cats
Dogs

32
Q

What does cheyletielldae cause?

A

Mild but highly contagious zoonosis

33
Q

What is the scientific name of berry bugs?

A

Trombiculidae/Neotrombicula autumnalis

34
Q

What is the appearance of berry bugs?

A

6 legged
Large
Orange/yellow larvae

35
Q

What do berry bugs cause?

A

Pruritic skin disease

36
Q

Name the 2 types of mesostigmatid.

A

Northern fowl/ornithonyssus sylvarium

Red mite/dermanyssus gallinae

37
Q

Which animal does mesostigmatid affect?

A

Birds

38
Q

Where is the lifecycle of northern fowl mite located?

A

Entire lifecycle on host, eggs at the base of feather

39
Q

How long is the northern fowl mite lifecycle?

A

5-12 days

40
Q

Where is the lifecycle of red mite located?

A
  • Most lifecycle of host
  • Feed at night
  • 34 weeks off host survival
41
Q

How long is the lifecycle of red mite?

A

7 day lifecycle
24 weeks off host survival

42
Q

What are the clinical signs caused by mesostigmatid mites?

A

Irritant
Anaemia in severe cases
Death
Decreased egg production

43
Q

What diseases can mesostigmatid mites transmit?

A

Salmonella
Mycoplasma
Avipox virus pathogens

44
Q

How are mesostigmatid mites and their transmitted diseases managed?

A

Avoid wild birds
Deep clean
Isoxazolines
Pyrethroids
Avermectins
IGRs sprays

45
Q
A

Animal Disease 1 (25 decks)

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