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Parasitology > Quiz 7 > Flashcards

Quiz 7 Flashcards

1
Q

Who is the host for Strongylus vulgaris

A

Horse

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2
Q

What does the worm Strongylus vulgaris look like?

A

Bard red with a large buccal capsule

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3
Q

What is the agent of Acute Verminous Arteritis?

A

Strongylus vulgaris

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4
Q

Life cycle of S vulgaris

A

Direct

Eggs passed in feces
L1-L3 in environment

Horse ingests L3
L3 penetrates mucosa of cecum/colon
L3-L4 in cecum/colon
L4 migrates through the mesenteric arteries
Molt to Immature adults-migrate to intestinal wall to develop into the adult

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5
Q

What causes aneurysms, thromboembolisms, intestinal infarctions?

A

S vulgaris

Acute Verminous Arteritis

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6
Q

How can you diagnose S vulgaris?

A

ELISA

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7
Q

What CS will you see with a S vulgaris infection?

A

acute colic and diarrhea

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8
Q

What is the primary parasitic pathogen of horses?

A

Cyanthostomes

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9
Q

What do you need to remember about the weather and Cyanthostomes

A

Resistant to colder weather

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10
Q

Life cycle of Cyanthostomes

A

Direct, non-migratory

Eggs in feces
L1-L3
L3 ingested and penetrate colonic and cecal mucosa
L3 to L4 and encysts (hypobiosis)
L4 remerges in the spring to the surface of the mucosa and molts into adults

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11
Q

What CS are you gonna see with larval cyanthostomiasis?

A

Colic

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12
Q

When you have thousands of L4 remerging at the same time what CS will you see for cyanthostomiasis?

A

PLN

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13
Q

How can you diagnose Cyanthostomes?

A

Larvae seen on a rectal palpation sleeve
CS and PCR

NO FECAL FLOAT

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14
Q

Why can you not see eggs on a fecal float when you see CS?

A

The CS occur onces the L4 have re-emerged. There are no eggs at this life stage

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15
Q

What parasite is common in the adult pig?

A

Oesophagostomum

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16
Q

Where is the oesophagostomum found in the body?

A

Lumen and SI

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17
Q

What parasite causes thin sow syndrome?

A

Oesophagostomum

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18
Q

Life Cycle of oesophagostomum

A

unebryonated eggs in feces
L1-L3 in enivronment
L3 ingested and encysts in/on intestinal wall
develop to L4
L4 re-emerges in 2wks-2mo and develops to adult

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19
Q

CS of Oesophagostomum

A

Catarrhal enteritis
Stunted growth
Nodules caseate and calcify

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20
Q

Dx of oesophagostomum

A

CS or post mortum

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21
Q

What parasite is found in cysts in the perirenal fat and the pelvis of the kidney in swine?

A

Stephanurus dentatus

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22
Q

What do the worms of S dentatus look like?

A

Mottled appearance

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23
Q

What kind of pig does S dentatus infect?

A

older pigs that are housed outdoors

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24
Q

Is S dentatus sensitive to the cold?

A

YES, free living larvae are killed by cold temps

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25
Q

Life Cycle of S dentatus

A

Eggs passed in URINE
Larvae in environment for several months
Larvae ingested by pigs OR penetrate skin of PH (earthworm)–L3
Larvae migrate from intestine to liver to retroperitoneal tissue surrounding kidney
Eggs in 9-16 months and can persist for 3 yrs
Transplacental transmission also possible

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26
Q

What is the primary pathology of s dentatus?

A

liver damage from migration.

Milk Spots

27
Q

What is a common CS of S dentatus

A

Failure to thrive
Weight loss
emaciation

28
Q

What other CS can be caused by S dentatus?

A

Paralysis–migration to spinal cord

29
Q

What is the scientific name for the grape worm?

A

Syngamus Trachea

30
Q

Who is the DH for Syngamus trachea?

A

Birds

31
Q

Who is the PH for Syngamus trachea?

A

what do birds eat?

Earthworms

32
Q

Life Cycle of Syngamus trachea

A

Direct

ingestion of egg for earthworm containing L3

33
Q

How do the adult Syngamus trachea look?

A

copula forming a Y shape

34
Q

CS of Syngamus trachea

A

Dyspnea, suffocation, gaping mouth, extended neck

Death

35
Q

Dx of Syngamus trachea?

A

eggs with bipolar plugs in FF

36
Q

What adult parasites are thin, reddish brown worms?

A

Ostertagia

37
Q

Who are the DH for ostertagia?

What is the other name for this

A

Cattle

Western Stomach worm

38
Q

LC of Ostertagia

A

Direct, non-migratory
Eggs in feces
Larvae to L3 on ground
DH ingests L3
Penetrate the gastric glands and molts in L4
Immature adults emerge onto mucosal surface and mature

39
Q

What are the 2 types of Ostertagia?

A

T1: Summer
Weanling calves in first grazing session
Diarrhea and weight loss
Lots of eggs and adult worms in feces

T2: Winter
Rapid emergence of hypobiotic larvae in yearling calves
Few eggs/adults in feces
High mortality, anemia, hypoproteinemia, emaciation, bottle jaw

40
Q

What is the scientific name for the barber pole worm? Why is it called this?

A

Haemonchus

Females look like barber poles-their uterus/ovaries wind around blood filled gut

41
Q

DH of Haemonchus

A

Sheep and cattle

42
Q

LC of Haemonchus

A

Direct, non-migratory
L3 ingested
Penetrate gastic epithelium of abomasum–L4–immature adult–re-emerge, mature to adult
Hypobiosis-“overwinter” and re-emerge in favorable conditions

43
Q

Will you see eggs during the hypobiosis phase?

A

NO

44
Q

Why will you see a periparturient rise in haemonchus?

A

Ewes at lambing-rapid pasture contamination

45
Q

When will you see anemia with haemonchus?

A

Acute with 10,000 worms

46
Q

What form is the most common form of Haemonchus?

A

Chronic-little or no anemia

47
Q

How do you Dx haemonchus?

A

FAMACHA,

FF

48
Q

What does Refugia mean?

A

Proportion of worm population that is not selected by drug treatment bc of selective tx rather than treating the whole herd

49
Q

Why do we think this selective tx works for resistance?

A

Resistant worms from treated population will be diluted by non-resistant worms from untreated populations

50
Q

Nematodirus DH?

A

Cattle and sheep

51
Q

LC of Nematodirus

A

Direct-L3 infective stage

52
Q

CS of Nematodiurs

A

Acute Diarrhea in young, could be fatal

53
Q

Dx of Nematodirus

A

LARGE eggs on FF or adult worms at necropsy

54
Q

Cooperia DH?

A

Cattle, sheep, goats

55
Q

LC

A

same as other L3 infective

Adults are in SI

56
Q

CS fo Cooperia

A

Diarrhea, anorexia, depressed growth

57
Q

Dx of Cooperia

A

Eggs in FF or adults at necropsy

58
Q

Trichostrongylus axei DH?

A

Cattle sheep goats-maybe horses

59
Q

CS fo Trichostrongylus axei

A

Gastroenteritis in young

60
Q

You are on a farm and multiple spp of animals are sick, what parasit could this be?

A

Trichostrongylus axei

they can cross infect

61
Q

Hyostrongylus DH

A

Swine

62
Q

LC fo Hyostrongylus

A

Direct, no migration

Larvae molt in the gastric mucosa in nodules

63
Q

CS of hyostrongylus

A

Anemia, poor appetite, melena
Nodules in gastric mucosa
Hemorrhagic gastritis

64
Q

Dx Hyostrongylus

A

Strongyle type egg or necropsy

Parasitology (5 decks)

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