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Flashcards in OV endoparasites Deck (36):
1

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Cephalic vesicle of nematodirus battus

2

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Brown, parallel sided egg of Nematodirus battus

3

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Rounded, clear-shelled egg of Nematodirus filicollis

4

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Large buccal cavity

Long, thin, fused tp spicules

Nematodirus battus

5

What part of the lifecycle of Nematodirus battus causes clinical disease in sheep?

L5 feeding on mucosa

6

Describe the diarrhoeic syndrome associated with Nematodirus battus.

  1. Pathology: 
    1. Catarrhal enteritis
    2. Villous atrophy
    3. Malabsorption
  2. Clinical signs
    1. Peracute explosive watery diarrhoea
    2. Anorexia
    3. Thirst
    4. Abdominal pain
    5. Wt loss

 

7

What age group of sheep are affected by Nematodirus battus?

4-12 weeks old lambs

8

What management protocols can be used to reduce infection of lambs with Nematodirus battus?

  • Prophylactic BZs/imidazole
  • Use disease forcasts
  • Pasture rotation - reduce exposure to spring emergence of larvae

 

9

Overwintering of Nematodirus battus larvae occurs where?

Significance?

On pasture - L3 within the egg

Spring emergence of larvae can cause mass diarrhoea in grazing lambs

10

What causes the spring emergence of Nematodirus battus?

First require a cold snap before warm temperatures (>10oC) causes hatching of eggs on pasture

11

How long do Nematodirus battus larvae stay within the egg?

Until they are L3

12

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Large eggs present within the uterus of Nematodirus battus

13

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Gut and uterus entwined in Haemonchus contortus

14

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Large asymmetrical buccal cavity of Haemonchus contortus

15

Outline the lifecycle of Haemonchus contortus

  1. Eggs in faeces
  2. Larvated egg
  3. Hatching
  4. L2 climb up grass and are ingested by sheep
  5. Attach to abomasal mucosa
  6. Larval to adult development within abomasum
  7. Larvae may hypobiose

 

16

Where in the sheep would Haemonchus contortus be found?

Abomasum

17

How do Haemonchus contortus survive overwinter?

Hypobiosed larvae within abomasum

Larvae DO NOT survive on pasture

18

FAMACHA score is used for assessment of what?

What does it score?

Haemonchus contortus load

Mucus membrane colour in conjunctiva

19

What specific anthelmintic is used in haemonchus contortus infection?

Monepantel

Startect

20

Barbervax is used against which ovine parasite

Haemonchus contortus

21

Haemonchus contortus are capable of consuming how much blood from their host per day?

0.5ml/worm/day

22

What clinical presentation is expected with Haemonchus contortus infection?

  • Acute haemorrhagic regenerative anaemia
  • Abomasal erosion
  • Severe hyperacute haemorrhagic gastroenteritis - sudden death
  • Wt loss
  • Submandibular oedema - hypoproteinaemia
  • Decreased PCV

23

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Taenia species armed rostellum

24

The sheep is what type of host for Taenia spp?

Intermediate

25

Treatment of Taenia spp is only useful in which type of host?

What is used?

Definitive host - dog

Praziquantel

26

Which dog taenia metacestodes species are found in sheep?

  1. Ovis - cystercercus - Deep muscle
  2. Hydatigena - cystercercus - peritoneum
  3. Multiceps - coenurus - brain

 

27

Liver condemnation is employed with infection with which type of Taenia in sheep?

Hydatigena - migrating cystercercus before reaching peritoneum

28

Which Echinococcus spp. metacestode is found in sheep?

Echinococcus granulosus granunosus

Hydatid cysts in liver and lungs

29

Which human taenia metacestodes species are found in pigs and cow?

  1. Solium - cystercercus - brain (neurocystercercosis)
  2. Saginata - metacestode - Muscle (intestinal upset)

 

30

The sheep is the definitive host of which tapeworm species?

What is the intermediate host?

Monenzia spp

Cystercercoid found in oribatid mites

31

Hairworm

Muellerius capillaris

32

Sheep worm

Muellerius capillaris

33

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Kinked tail of L1 Muellerius capillaris

34

Outline the lifecycle of Muellerius capillaris.

  1. Eggs in faeces
  2. Ingested by intermediate host - molluscs
  3. Develop to L3 within intermediate
  4. Sheep ingests IMH
  5. Lympho-tracheal migration of larvae
  6. Adults lay eggs in pulmonary system which are coughed up and swallowed 

 

35

True or false.

Muerllerius capillaris causes more severe disease in sheep than goats.

Outline the clinical signs.

False - more severe in goats

  • >6mo
  • Bronchopneumonia
  • Severe inflammatory reaction
  • SBI 

 

36

PPP of muellerius capillaris

1 month