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OV endoparasites Flashcards

1
Q
A

Cephalic vesicle of nematodirus battus

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2
Q
A

Brown, parallel sided egg of Nematodirus battus

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3
Q
A

Rounded, clear-shelled egg of Nematodirus filicollis

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4
Q
A

Large buccal cavity

Long, thin, fused tp spicules

Nematodirus battus

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5
Q

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

A

L5 feeding on mucosa

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6
Q

Describe the diarrhoeic syndrome associated with Nematodirus battus.

A
  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
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7
Q

What age group of sheep are affected by Nematodirus battus?

A

4-12 weeks old lambs

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8
Q

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

A
  • Prophylactic BZs/imidazole
  • Use disease forcasts
  • Pasture rotation - reduce exposure to spring emergence of larvae
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9
Q

Overwintering of Nematodirus battus larvae occurs where?

Significance?

A

On pasture - L3 within the egg

Spring emergence of larvae can cause mass diarrhoea in grazing lambs

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10
Q

What causes the spring emergence of Nematodirus battus?

A

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

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11
Q

How long do Nematodirus battus larvae stay within the egg?

A

Until they are L3

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12
Q
A

Large eggs present within the uterus of Nematodirus battus

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13
Q
A

Gut and uterus entwined in Haemonchus contortus

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14
Q
A

Large asymmetrical buccal cavity of Haemonchus contortus

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15
Q

Outline the lifecycle of Haemonchus contortus

A
  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
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16
Q

Where in the sheep would Haemonchus contortus be found?

17
Q

How do Haemonchus contortus survive overwinter?

A

Hypobiosed larvae within abomasum

Larvae DO NOT survive on pasture

18
Q

FAMACHA score is used for assessment of what?

What does it score?

A

Haemonchus contortus load

Mucus membrane colour in conjunctiva

19
Q

What specific anthelmintic is used in haemonchus contortus infection?

A

Monepantel

Startect

20
Q

Barbervax is used against which ovine parasite

A

Haemonchus contortus

21
Q

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

A

0.5ml/worm/day

22
Q

What clinical presentation is expected with Haemonchus contortus infection?

A
  • Acute haemorrhagic regenerative anaemia
  • Abomasal erosion
  • Severe hyperacute haemorrhagic gastroenteritis - sudden death
  • Wt loss
  • Submandibular oedema - hypoproteinaemia
  • Decreased PCV
23
Q
A

Taenia species armed rostellum

24
Q

The sheep is what type of host for Taenia spp?

A

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
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

PARA (16 decks)

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