Dictyocaulus Viviparus

Question 1

What is D. viviparus?

Answer 1

Cattle lungworm

Question 2

What is the name of sheep/goat lungworm?

Answer 2

D. filaria
Muellerius capillaris

Question 3

What is name of horse /donkey lungworm?
What does it cause?

Answer 3

D. arnfieldi
–Respiratory disease in horses
–Patent infection in donkeys,
* no disease,
* carriers,

Question 4

What is the morphology of adult worms?

Answer 4

–4 to 8cm long
–Slender, white
–Male has reduced bursa

Question 5

How do you diagnose lungworm antemortem?

Answer 5

*clinical signs
*L1 in faeces using baermann apparatus
*Milk ELISA

Question 6

D. Viviparus are ovo-viviparous, What does this mean?

Answer 6

Lay larvated eggs that hatch immediately

Question 7

What is the life-cycle of D. viviparus?

Answer 7

1. L1 in lungs coughed up + swallowed + passed out in faeces
2. L1 develop to L3 in faeces (infective stage)
3. 0-7 days post-infection - L3 ingested + lympho-tracheal migration
4. Moults to L4 in lymph nodes + travels to lungs
5. 8-25 days post-infection L4-L5 in lungs - L5 migrate up bronchial tree + adults in bronchi and trachea
6. 26-55days post-infection - adults in URT + eggs + L1
7. 55 days+ protective immunity

Question 8

Which animals are meant to be affected by D. viviparus?

Answer 8

Smallest + weakest calves

Question 9

How is lungworms treated / controlled?

Answer 9

*Anthelmintics
*NSAIDs + antibiotics
*Huskvac