Haemonchus Contortus

Question 1

What is the common name for the female haemonchus contortus?

Answer 1

Barbers pole worm

Question 2

Where is the H contortus found?

Answer 2

Abomasum

Question 3

How long is the H contortus?

Answer 3

3 cm

Question 4

Describe the morphology of H contortus

Answer 4

Cervical papillae
White ovaries wrapped round gut
Asymmetrical dorsal lobe

Question 5

What is the life cycle of H contortus similar to?

Answer 5

Trichostronglyle

Question 6

Describe the pathogenesis of H contortus?

Answer 6

Adults feed on blood
Erosion of abomasal wall
Severe haemorrhagic gastritis

Question 7

Describe the epidemiology of H contortus

Answer 7

L3 do not survive the UK winter
Ewe is the main source of pasture contamination (PPR)
Outbreaks of disease in late summer

Question 8

How is H contortus controlled?

Answer 8

1 BZs- white drenches
2 LEVs- yellow drenches
Macrocyclic lactones- clear drenches
amino-acetonitrile derivative

Question 9

What are the clinical signs of H contortus?

Answer 9

Severe anaemia- conjunctiva
Oedema
Weight loss

Question 10

How is H contortus diagnosed?

Answer 10

Anaemia
Season- late summer
Faecal egg counts