Nematodirus spp. (2)

Question 1

What are the hosts?

Answer 1

Sheep

Goats

Cattle

Question 2

Describe an adult

Answer 2

Large - up to 2.5 cm long

In small intestine

Female has a spine on the tip of tail

Appearance similar to cotton

Question 3

Describe eggs

Answer 3

Very large - 130 micro m

Distinctive large cells inside - 2-8

Individually identified

Question 4

Describe the life cycle

Answer 4

L1 -> L2 -> L3 all inside egg

L1 -> L3: at least 2 months

L3 can survive in egg up to 2 years

L3 infective

PPP: 3 weeks

Question 5

What is the site of infection?

Answer 5

Small intestine

Question 6

Describe the Pathogenesis

Answer 6

Lamb to lamb

Larval stages - development disrupts intestinal mucosa
- Fecal examination not helpful

Carcass dehydrated
- Lambs remain near water while ewes spend time grazing -
noticeable separation

Question 7

Describe the clinical signs

Answer 7

Sudden onset of ill thrift in lambs

Severe diarrhea

Mortality can reach 30%

Dehydration

Question 8

How do you diagnose?

Answer 8

Clinical signs during PPP

Egg counts are of little value

When eggs, EPG low(600-3000)

Grazing history

Necropsy

 - Dehydrated carcass
 - Mild catarrhal enteritis

Question 9

How to treat and prevent?

Answer 9

Avoid pastures used the previous year in the spring/early summer

Prophylactic treatment; predictions

Question 10

What is the common name?

Answer 10

Long neck bankrupt worm