OV endoparasites Flashcards
Cephalic vesicle of nematodirus battus
Brown, parallel sided egg of Nematodirus battus
Rounded, clear-shelled egg of Nematodirus filicollis
Large buccal cavity
Long, thin, fused tp spicules
Nematodirus battus
What part of the lifecycle of Nematodirus battus causes clinical disease in sheep?
L5 feeding on mucosa
Describe the diarrhoeic syndrome associated with Nematodirus battus.
- Pathology:
- Catarrhal enteritis
- Villous atrophy
- Malabsorption
- Clinical signs
- Peracute explosive watery diarrhoea
- Anorexia
- Thirst
- Abdominal pain
- Wt loss
What age group of sheep are affected by Nematodirus battus?
4-12 weeks old lambs
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
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
What causes the spring emergence of Nematodirus battus?
First require a cold snap before warm temperatures (>10oC) causes hatching of eggs on pasture
How long do Nematodirus battus larvae stay within the egg?
Until they are L3
Large eggs present within the uterus of Nematodirus battus
Gut and uterus entwined in Haemonchus contortus
Large asymmetrical buccal cavity of Haemonchus contortus
Outline the lifecycle of Haemonchus contortus
- Eggs in faeces
- Larvated egg
- Hatching
- L2 climb up grass and are ingested by sheep
- Attach to abomasal mucosa
- Larval to adult development within abomasum
- Larvae may hypobiose
Where in the sheep would Haemonchus contortus be found?
Abomasum
How do Haemonchus contortus survive overwinter?
Hypobiosed larvae within abomasum
Larvae DO NOT survive on pasture
FAMACHA score is used for assessment of what?
What does it score?
Haemonchus contortus load
Mucus membrane colour in conjunctiva
What specific anthelmintic is used in haemonchus contortus infection?
Monepantel
Startect
Barbervax is used against which ovine parasite
Haemonchus contortus
Haemonchus contortus are capable of consuming how much blood from their host per day?
0.5ml/worm/day
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
Taenia species armed rostellum
The sheep is what type of host for Taenia spp?
Intermediate
Treatment of Taenia spp is only useful in which type of host?
What is used?
Definitive host - dog
Praziquantel
Which dog taenia metacestodes species are found in sheep?
- Ovis - cystercercus - Deep muscle
- Hydatigena - cystercercus - peritoneum
- Multiceps - coenurus - brain
Liver condemnation is employed with infection with which type of Taenia in sheep?
Hydatigena - migrating cystercercus before reaching peritoneum
Which Echinococcus spp. metacestode is found in sheep?
Echinococcus granulosus granunosus
Hydatid cysts in liver and lungs
Which human taenia metacestodes species are found in pigs and cow?
- Solium - cystercercus - brain (neurocystercercosis)
- Saginata - metacestode - Muscle (intestinal upset)
The sheep is the definitive host of which tapeworm species?
What is the intermediate host?
Monenzia spp
Cystercercoid found in oribatid mites
Hairworm
Muellerius capillaris
Sheep worm
Muellerius capillaris
Kinked tail of L1 Muellerius capillaris
Outline the lifecycle of Muellerius capillaris.
- Eggs in faeces
- Ingested by intermediate host - molluscs
- Develop to L3 within intermediate
- Sheep ingests IMH
- Lympho-tracheal migration of larvae
- Adults lay eggs in pulmonary system which are coughed up and swallowed
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
PPP of muellerius capillaris
1 month
