Haemonchus contortus Flashcards
1
Q
What is the most important clinical sign of Haemonchus contortus, and how can this be assessed?
A
- Anaemia
- by looking at the animals eyelids
2
Q
Why is Haemonchus contortus referred to as a ‘Barber’s pole worm’?
A
A female worm has a red and white spiral appearance because of the ovaries being wrapped around the gut
3
Q
What is Haemonchus contortus found in the host?
A
Abomasum
4
Q
Describe the morphology of an adult worm
A
- Large 3cm
- Cervical papillae
- Asymmetrical dorsal lobe
- white ovaries wrapped around gut
5
Q
Give the key points of the life cycle
A
- typical trichostrongyle
- PPP=3weeks
- Larvae develop in mucosa
- Adults are blood feeders
- hypobiosis
6
Q
Describe the pathogenesis of Haemonchus contortus
A
- Adults feed on blood
- Erosion of the abomasal wall
- Severe haemorrhagic gastritis
7
Q
What are the 3 clinical signs of Haemonchus contortus?
A
- Weight loss
- Anaemia
- Oedema
8
Q
Why is control of Haemonchus contortus now difficult?
A
Parasite has become resistant to BZs, LEV and MLs
