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RUSVM Parasitology > Exam II - Word Association > Flashcards

Exam II - Word Association Flashcards

1
Q

Profuse watery diarrhea; most 1st season grazing calves affected. What’s the parasite?

A

Ostertagia ostertagi

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2
Q

Mild pathogens; clinical signs only seen when present in large numbers and calves are stressed. What’s the parasite?

A

Cooperia spp.

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3
Q

Parasite of donkeys; no observable clinical signs seen. What’s the parasite?

A

Dictyocaulus arnfieldi

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4
Q

peri-anal irritation

A

Oxyuris equi

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5
Q

Anemic sheep with bottle jaw

A

Haemonchus contortus

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6
Q

What is the diagnostic method used for Fasciola hepatica?

A

sedimentation

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7
Q

What is the diagnostic method used for large strongyles?

A

fecal egg count and fecal culture

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8
Q

What is the diagnostic method used for cyanthostomins?

A

fecal egg count and fecal culture

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9
Q

What is the diagnostic method used for Anoplocephala spp?

A

sedimentation, centrifugal/floatation

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10
Q

What is the diagnostic method used for Haemonchus spp?

A

fecal egg count and fecal culture

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11
Q

What is the diagnostic method used for Sarcocystis neurona?

A

tests on CSF

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12
Q

What is the diagnostic method used for Eimeria leukarti?

A

sugar floatation or sedimentation

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13
Q

What is the diagnostic method used for Eimeria spp in cattle?

A

McMaster method

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14
Q

What is/are the site(s) of infection for Ostertagia ostertagi adults?

A

abomasum

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15
Q

What is/are the site(s) of infection for Dictyocaulus viviparous adults?

A

trachea & bronchi

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16
Q

What is/are the site(s) of infection for Taenia saginata in cattle?

A

muscle tissue

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17
Q

What is/are the site(s) of infection for Oesophagostomum spp adults?

A

large intestine

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18
Q

What is/are the site(s) of infection for Giardia intestinalis trophozoites?

A

small intestine

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19
Q

5.5-7.5 mm in length; fleshy, spongy mouthparts. What is the parasite?

A

Musca spp.

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20
Q

Wing span up to 6.5 cm; slashing/sponging mouthparts. What is the parasite?

A

Tabanus spp.

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21
Q

Eggs deposited on hair; 3rd instars found in feces. What is the parasite?

A

Gasterophilus spp.

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22
Q

1.5-5.0 mm in length; short, piercing proboscis. What is the parasite?

A

Culicoides spp.

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23
Q

Which type of ostertagiosis occurs in winter or spring?

A

Type II

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24
Q

True or false: Culicoides spp. transmit Habronema spp.

A

False. Culicoides spp. transmit Onchocerca in horses and cattle

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25
Q

True or false: Stable flies may cause an allergic dermatitis

A

False.

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26
Q

True or false: Tabanus spp. inflict painful bites and may transmit several diseases

A

True

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27
Q

True or false: Musca autumnalis transmits African horse sickness

A

False. Culicoides transmits African horse sickness

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28
Q

True or false: Choripotes bovis is found on the distal part of the limbs

A

True.

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29
Q

True or false: Gasterophilus spp pupae provoke an inflammatory reaction in the stomach lining

A

False. Gasterophilus spp. pupate in the soil. Gasterophilus L3 can cause an inflammatory reaction in the stomach lining

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30
Q

True or false: Regarding Sarcocystis spp, fecal contamination results in infection of the final host

A

False.

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31
Q

True or false: Regarding Sarcocystis spp, fecal contamination results in infection in the intermediate host

A

True.

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32
Q

True or false: Regarding Sarcocystis spp, the life cycle stages in the final host won’t always result in clinical signs

A

True

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33
Q

The most significant group of parasites challenging horses in North America today are:

A

small strongyles

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34
Q

True or false: the eggs of cyanthostomins are easily differentiated from those of large strongyles

A

False.

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35
Q

True or false: the McMaster method is used to asses the degree to which an equid is contaminating the pasture

A

True.

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36
Q

True or false: Horses do not have inherent resistance to small strongyles

37
Q

True or false: The trophozoite is the infective stage for Giardia intestinalis

38
Q

True or false: In Giardia intestinalis, trophozoites multiply by schizogony and gametogony in cattle hosts

A

False. Trophozoites multiply asexually (binary fission)

39
Q

True or false: Regarding the beef tapeworm, the oncosphere is the infective stage for the human

A

False. For Taenia saginata, the oncosphere is the infective stage for cattle

40
Q

Regarding Taenia saginata, what is the infective stage to the final host?

A

Cysticerci

41
Q

What is the common name for Oesophagostomum spp?

A

Nodular worm, pimply worm

42
Q

What is the scientific name for the barber pole worm?

A

Haemonchus placei

43
Q

For Sarcocystis neurona, what is the infective stage for horses?

44
Q

Necropsy of a calf reveals slender white nematodes approx. 8 cm long in the bronchi & trachea and signs of severe bronchitis & pneumonia. Other calves on the pasture are coughing and some are showing signs of breathing through their mouths with their heads and necks outstretched. What’s the parasite?

A

Dictyocaulus viviparous

45
Q

An owner complains that his pony has crusty lesions with thickened skin above the hooves. What is most likely the parasite

A

Chorioptes bovis

46
Q

True or false: Fascioloides magna is diagnosed in cattle by ID of the eggs in fecal sedimentation

A

False. Fluke eggs are not seen in feces in cattle, sheep, or goats

47
Q

True or false: In cattle, Fascioloides magna is present in cysts in the peritoneal cavity.

A

False. In cattle, Fascioloides magna cysts are formed in the liver.

48
Q

Clinical signs seen with Ostertagia ostertagi infection in calves are related to:

A

the emergence of the nematodes from the gastric glands (becoming an adult)

49
Q

The larvae of this parasite burrows and forms “molting pockets”

A

Sarcoptes scabei

50
Q

What is the site of infection for Babesia canis?

51
Q

“Pipe stem liver” - What’s the parasite?

A

Fasciola hepatica

52
Q

Draschia megastoma is transmitted by:

A

Musca spp.

53
Q

Bluetongue & African Horse Sickness are transmitted by:

A

Culicoides spp.

54
Q

Rhipicephalus sanguineus and Dermacentor variabilis both transmit:

A

Rocky Mountain Spotted Fever

55
Q

Demonstration of oocysts in a fresh fecal exam would most likely be seen in which two parasites?

A

Cystoisospora (Isospora) canis and Eimeria leukarti

56
Q

Demonstration of trophozoites in a blood smear - associated with which parasite?

A

Babesia spp.

57
Q

“Summer sores” - what’s the parasite?

A

Habronema spp.

58
Q

“faulty regurgitation” - what’s the parasite?

A

Hypoderma spp.

59
Q

Chronic diarrhea, weight loss, and edema - what’s the parasite?

A

Cyanthostomins

60
Q

How does transmission of Theileria (Cytauxzoon) spp occur?

A

transmitted via bite of an infected tick (Amblyomma americanum)

61
Q

How does transmission of Dictyocaulus occur?

A

ingestion of infective larvae

62
Q

How do humans become infected with Sarcocystis neurona?

A

This parasite does not cause a zoonosis.

63
Q

How do humans become infected with Anoplocephala spp?

A

This parasite does not cause a zoonosis.

64
Q

How do humans become infected with Toxoplasma gondii?

A

Ingesting infective uncooked or undercooked meat

65
Q

How do humans become infected with Taenia saginata?

A

Ingesting infective uncooked or undercooked meat

66
Q

A puppy is presented showing signs of weakness and anemia. The puppy is infested with external parasites which you diagnose as 2 species of dog lice. What are the 2 species?

A

Trichodectes canis and Linognathus setosus

67
Q

Sarcocystis neurona causes neurological disease in horses. The definitive host may become infected by ingesting a:

A

mature sarcocyst

68
Q

What is the infective stage for cattle of Taenia saginata?

A

oncosphere

69
Q

A fecal sedimentation is performed on a heifer with anemia and bottle jaw. The organism below was recovered. How did the heifer aquire this parasite?

A

The heifer acquired this parasite (Fasciola hepatica) by ingesting metacercariae on vegetation

70
Q

The ________ method is used to assess the degree to which an equid is contaminating a pasture

71
Q

True or false: Blow flies may be responsible for cutaneous myiasis in animals

72
Q

“Rectangular basis capituli” - what’s the parasite?

A

Dermacentor spp

73
Q

“hexagonal basis capituli” - what’s the parasite?

A

Rhipicephalus spp.

74
Q

Pictured are the mouthparts of an ixodid tick. Where are the palps?

75
Q

Pictured are the mouthparts of an ixodid tick. Where is the basis capituli?

76
Q

How long can a pre-emerged Ctenocephalides live?

77
Q

Which parasite lays its eggs on fresh, uninfected wounds?

A

Cochliomyia hominovorax

78
Q

True or false: an important aspect of control for *Stomoxys calcitrans *and *Musca autumnalis *is management of feces and compost

79
Q

True or false: Myiasis is the presence of the eggs of dipteran flies in living animal tissue

A

False, mutha fucka!

Myiasis is defined as the infestation of living animals with the larvae of dipteran flies

80
Q

True or false: Cattle grub are often found in lumps on the backs of cattle in the winter

A

False. Cattle grub (Hypoderma spp.) are often found in lumps on the backs of cattle in the summer.

81
Q

What is the common name for Oxyuris equi?

A

large pinworm

82
Q

Where would you find arrested larvae of Strongyloides westeri?

A

Somatic tissue

83
Q

Necropsy of a 5 year old pony these stages attached to the lining of the stomach. What is the parasite? Where are its eggs deposited?

A

Gastrophilus spp. Deposited on the forelegs and shoulder of equids.

84
Q

For many fly species, a recommended prevention option is to compost the feces of the host.

In which species will composting the host feces not help?

A
  • Tabanus spp - eggs are laid in muddy or marshy areas, not feces
  • Chrysops spp - eggs are laid in muddy or marshy areas, not feces
  • Haematobia irritans - flies spend most of their time on the host, so it’s unlikely you’d be able to compost the feces in time
85
Q

Causes “blowfly strike” - What’s the parasite?

A

Cochliomyia hominovorax

86
Q

Which parasite is responsible for the lesion pictured? Where does the parasite lay its eggs?

A

Cochliomyia hominovorax (New World Screwworm)

Eggs are laid on edges of fresh, uninfected wounds

87
Q

“Lyme-disease tick” - what is the parasite?

A

Ixodes spp.

88
Q

Which parasite is a common vector for Hepatazoon americanum?

What is the site of infection for Hepatazoon americanum?

A

Amblyomma maculatum

White blood cells

(Hepatozoon canis is present in areas of North America where its vector, Rhipicephalus sanguineus, occurs)

RUSVM Parasitology (124 decks)

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