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Flashcards in Quiz 7 Deck (64):
1

Who is the host for Strongylus vulgaris

Horse

2

What does the worm Strongylus vulgaris look like?

Bard red with a large buccal capsule

3

What is the agent of Acute Verminous Arteritis?

Strongylus vulgaris

4

Life cycle of S vulgaris

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

5

What causes aneurysms, thromboembolisms, intestinal infarctions?

S vulgaris
Acute Verminous Arteritis

6

How can you diagnose S vulgaris?

ELISA

7

What CS will you see with a S vulgaris infection?

acute colic and diarrhea

8

What is the primary parasitic pathogen of horses?

Cyanthostomes

9

What do you need to remember about the weather and Cyanthostomes

Resistant to colder weather

10

Life cycle of Cyanthostomes

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

11

What CS are you gonna see with larval cyanthostomiasis?

Colic

12

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

PLN

13

How can you diagnose Cyanthostomes?

Larvae seen on a rectal palpation sleeve
CS and PCR

NO FECAL FLOAT

14

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

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

15

What parasite is common in the adult pig?

Oesophagostomum

16

Where is the oesophagostomum found in the body?

Lumen and SI

17

What parasite causes thin sow syndrome?

Oesophagostomum

18

Life Cycle of oesophagostomum

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

19

CS of Oesophagostomum

Catarrhal enteritis
Stunted growth
Nodules caseate and calcify

20

Dx of oesophagostomum

CS or post mortum

21

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

Stephanurus dentatus

22

What do the worms of S dentatus look like?

Mottled appearance

23

What kind of pig does S dentatus infect?

older pigs that are housed outdoors

24

Is S dentatus sensitive to the cold?

YES, free living larvae are killed by cold temps

25

Life Cycle of S dentatus

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

26

What is the primary pathology of s dentatus?

liver damage from migration.

Milk Spots

27

What is a common CS of S dentatus

Failure to thrive
Weight loss
emaciation

28

What other CS can be caused by S dentatus?

Paralysis--migration to spinal cord

29

What is the scientific name for the grape worm?

Syngamus Trachea

30

Who is the DH for Syngamus trachea?

Birds

31

Who is the PH for Syngamus trachea?

what do birds eat?

Earthworms

32

Life Cycle of Syngamus trachea

Direct
ingestion of egg for earthworm containing L3

33

How do the adult Syngamus trachea look?

copula forming a Y shape

34

CS of Syngamus trachea

Dyspnea, suffocation, gaping mouth, extended neck

Death

35

Dx of Syngamus trachea?

eggs with bipolar plugs in FF

36

What adult parasites are thin, reddish brown worms?

Ostertagia

37

Who are the DH for ostertagia?
What is the other name for this

Cattle

Western Stomach worm

38

LC of Ostertagia

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

What are the 2 types of Ostertagia?

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

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

Haemonchus

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

41

DH of Haemonchus

Sheep and cattle

42

LC of Haemonchus

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

Will you see eggs during the hypobiosis phase?

NO

44

Why will you see a periparturient rise in haemonchus?

Ewes at lambing-rapid pasture contamination

45

When will you see anemia with haemonchus?

Acute with 10,000 worms

46

What form is the most common form of Haemonchus?

Chronic-little or no anemia

47

How do you Dx haemonchus?

FAMACHA,
FF

48

What does Refugia mean?

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

49

Why do we think this selective tx works for resistance?

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

50

Nematodirus DH?

Cattle and sheep

51

LC of Nematodirus

Direct-L3 infective stage

52

CS of Nematodiurs

Acute Diarrhea in young, could be fatal

53

Dx of Nematodirus

LARGE eggs on FF or adult worms at necropsy

54

Cooperia DH?

Cattle, sheep, goats

55

LC

same as other L3 infective
Adults are in SI

56

CS fo Cooperia

Diarrhea, anorexia, depressed growth

57

Dx of Cooperia

Eggs in FF or adults at necropsy

58

Trichostrongylus axei DH?

Cattle sheep goats-maybe horses

59

CS fo Trichostrongylus axei

Gastroenteritis in young

60

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

Trichostrongylus axei

they can cross infect

61

Hyostrongylus DH

Swine

62

LC fo Hyostrongylus

Direct, no migration
Larvae molt in the gastric mucosa in nodules

63

CS of hyostrongylus

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

64

Dx Hyostrongylus

Strongyle type egg or necropsy