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RUSVM Parasitology > Ascarids > Flashcards

Ascarids Flashcards

1
Q

What are the characteristics of Arachnids?

A

Nymph and adult : 4 pairs of legs
Larvae : 3 pairs of legs

Cephalo-thorax
Abdomen

No antennae
Palps

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2
Q

What are the two families of ticks?

A

Ixodidae - hard tick

Argasidae -soft tick

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3
Q

What are the life cycle stages of a tick?

A

Egg - larvae - nymph- adult

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4
Q

What are damaging effects of Ixodid ticks

A

Suck blood
Lesions from mouthparts -> predisposed for infections
Transmission of disease
Tick paralysis

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5
Q

Common name of Ixodes spp?

A

Black-legged tick

Deer tick

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6
Q

Host of Ixodes spp?

A

All mammals, birds, humans

Larvae and nymphs feed on mice and adults on deer

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7
Q

ID

Scutum 
Small dark brown 
No festoons 
Long palps 
Anal groove forms an arch anterior to the anus
A

Ixodes spp

Blacke legged tick

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8
Q

Life cycle of Ixodes spp?

A

Three host tick

Females engorge in fall, overwinter and lay eggs in spring

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9
Q

What is the site of infestation of Ixodes spp?

A

Skin

Especially axilla, inguinal region, face, and ears

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10
Q

What is the pathogenesis of Ixodes spp?

A

Paralysis in animals
Local skin reactions to bites
Transmit Borrelia burgdorferi (Lyme disease)

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11
Q

Common name Dermacentor spp?

A

D. Variabilis - American dog tick
D. Andersoni - Rocky Mountain wood tick
D. Albipictus - winter or elk tick
D.nitens - tropical horse tick

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12
Q

Hosts of Dermacentor spp?

A

Larvae and nymph- small rodents

Adult- dog and humans

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13
Q

ID

Dog
Rectangular basis capituli
Short palps
Orate scutum festoons

A

Dermacentor spp

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14
Q

What is the life cycle of Dermacentor spp?

A

Three host tic

Several months to year

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15
Q

Site of infection of Dermacentor spp?

A

Skin around head and neck

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16
Q

What tick species transmits Rocky Mountain Spotted Fever, cytauxzoonosis, and can cause tick paralysis

A

Dermacentor spp

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17
Q

What is the common name of Rhipicephalus sanguineus?

A

Brown dog tick

Kennel tick

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18
Q

Host of Rhipicephalus sanguineus ?

A

Dog and human

Southern US

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19
Q

ID
Dog

Hexagonal basis capituli
Inornate scutum
Short palp
Festoons

A

Rhipicephalus sanguineus

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20
Q

What is the life cycle of Rhipicephalus sanguineus?

A

Three host tick

Adapted to indoor living

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21
Q

What is the site of infestation of Rhipicephalus sanguineus ?

A

Adult- between toes and ears

Larvae and nymphs- back of neck

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22
Q

What tick species transmits Babesia canis and Eherlichia canis?

A

Rhipicephalus sanguineus

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23
Q

What are the treatment and prevention methods of ticks in cats and dogs?

A

Manually remove tick

Acaricides

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24
Q

What tick only infects one host in its life cycle?

A

Rhipicephalus (Boophilus) spp

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25
Q

Hosts of Rhipicephalus (boophilus) spp?

A

Cattle and other large hosts

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26
Q

ID
Cattle

Hexagonal basis capituli
Prominent dorsal ridges
Short palps

A

Rhipicephalus (Boophilus) spp

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27
Q

What is the site of infestation of Rhipicephalus (Boophilus) spp?

A

Ventral aspects of body (adults)

Immatures in ears

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28
Q

What tick species cause transmits Bovine piroplasmosis and gallsickness?

A

Rhipicephalus (Boophilus) spp

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29
Q

Common name of Amblyomma spp?

A

Lone star tick
Gulf Coast tick
Tropical bone tick

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30
Q

Host of Amblyomma spp?

A

Human
Livestock
Dog
Cat

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31
Q

ID

Long palps
Ornate scutum
Banded legs

A

Amblyomma spp

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32
Q

What is the pathogenesis of Amblyomma spp?

A

Painful bite (large mouthparts)

Transmit disease
-rickettsial
-hepatozoon americanum
Cytauxzoon felis

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33
Q

What hard tick is reportable ?

A

Rhipicephalus (boophilus) spp

34
Q

Common name of Rhipicephalus (Boophilus) spp?

A

Blue tick
Cattle fever tick
Tropical cattle tick

35
Q

Soft ticks belong to the order ___________

A

Argasidae

36
Q

What are the characteristics of soft ticks (Argasids)

A

No dorsal Sheila/scutum

Leather tegument, spinose and bumpy

Mouthparts ventrally placed

> 2nymph stages

37
Q

What are the two genus of Argasidae?

A

Otobius spp -spinose ear tick

Argas spp- fowl tick

38
Q

Common name of Otobius spp?

A

Spinose ear tick

39
Q

Host of Otobius spp?

A

Livestock, human, dog

40
Q

Pathogenesis of Otobius spp?

A

Ear canal affected seriously in large tick buildup

Heavy infestation leads to anemia

41
Q

Commonname of Argas spp?

A

Fowl tick

42
Q

Host of Argas spp?

A

Domestic and wild fowl

43
Q

ID

Fowl
Soft tick
Leathery, textured body, lateral line/crease

A

Argas spp

44
Q

Life cycle to Argas spp?

A

Engorge rapidly
Survive arid conditions
Transmit pathogens

45
Q

ID

Microscopic, <1mm long
Body with scales, spines, setae(hairs)

A

Mites

46
Q

What are the three life strategies of mites?

A

Burrowing - Sarcoptes and Notoedres

Non-burrowing -Psoroptes, Cheyletiella, Chorioptes

Restricted -Otodectes

47
Q

Common name of Sarcoptes scabiei

A

Sarcoptic mange
Itch mite
Scabies mite

48
Q

Host of Sarcoptes scabiei?

A

All domestic animals and humans

49
Q

What are the life cycle stages of Sarcoptes scabiei?

A

Eggs larvae nymph adult

50
Q

What are the clinical signs of S. scabiei in dogs?

A

Begin on hairless areas

Follicular papules
Erythema
Crust of dried serum and blood
Pruritus

51
Q

What is the main mode of S. scabiei between swine?

A

Sows to piglets during suckling

Boars to gilts

52
Q

What is the pathogenesis of S. scabiei in swine?

A

Pigs itch -> lose condition
First lesions are wheals; erythema around eyes, snout, external ear, front of hock
Progress to scabs

Crusty lesions ->hyperkeratosis

53
Q

How do you diagnose a mite infection

A

Mites from ear wax
Skin scraping

Clinical signs- pruritus

54
Q

What is the pathogenesis of S. scabiei in cattle?

A 
Scaly skin (mild)
Thickened skin (heavy) 
Downgrading of hides, drop in meat /milk production
55
Q

A Sarcoptes scabiei infection in what species is reportable?

A

Cattle

56
Q

What is the treatment for Sarcoptes scabiei?

A

MCL (dog, cattle, and swine)

Treat sows before farrowing
Eprinomectin for lactating dairy cattle

57
Q

What is the common name of Notoedries cati?

A

Noteodric cat mite

58
Q

Hosts of Notoedres cati?

A

Cat

Occasionally dog or rabbit

59
Q

Site of infestation of Notoedres cati?

A

Head

60
Q

Common name of Knemidocoptes spp?

A

Scaly leg mite

Scaly face mite

61
Q

Host of Knemidocoptes spp?

A

Chicken and turkey

Cage bird

62
Q

Site of infestation of Knemidocoptes spp?

A

Under scales of leg, comb, wattles, and neck

63
Q

______________ leads to inflammation and keratinization of skin of legs/face, lameness, or malformation of feet in birds

A

Knemidocoptes spp

64
Q

Choriopes bovis hosts?

A

Cattle, small ruminant, equids

Non-burrowing mite

65
Q

ID

Mite
Rounded mouthparts
Sucker shape at end of stalks

A

Chorioptes bovis

66
Q

Site of infestation of Chorioptes bovis?

A

Tailhead, udder and legs

67
Q

Common name of psoroptes ovis?

A

Sheep scab mite

68
Q

Host of Psoroptes ovis?

A

Sheep and cattle

69
Q

ID

Mite
Oval
Pointed mouthparts

Causes scab mange

A

Psoroptes ovis

Mouthparts-pierce and chew

70
Q

Diagnose

Sheep
Zone of inflammation with serous exudate
Dry crust with moist borders

Itching, restless rubbing, scratching, ragged wool

A

Psoroptes ovis

71
Q

What mite species rapidly spreads during winter but is found in axilla, groin, and inner pinna during summer

A

Psoroptes ovis

72
Q

What mite infections are reportable?

A

Psoroptes ovis

Sarcoptes scabiei - cattle

73
Q

Common name of Otodectes cynotis

A

Ear mite

74
Q

Host of Otodectes cynotis

A

Dog, cat, ferret, fox, rabbit, human

75
Q

Site of infection of Otodectes cynotis

A

Ear

76
Q

Diagnose

Cat
Dry waxy parchment-like material in ear
Like coffee grounds

A

Otodectes cynotis

77
Q

Host of cheyletiella yasguri

A

Dog and human

78
Q

Pathogenesis of Cheyletiella yasguri ?

A

“Walking dandruff” in fur and hair

79
Q

Diagnosis of Cheyletiella yasguri?

A

Adhesive tape or scotch tape swab

80
Q

Common name of Demodex canis? What is the host?

A

Demodectic mange mite
Follicle mite

Dog

81
Q

Where is Demodex canis found?

A

Hair follicles and sebaceous glands (entire life cycle)

RUSVM Parasitology (12 decks)

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