Telodorsagia circumcincta (1)

Question 1

What are the hosts?

Answer 1

Sheep and goats

Question 2

Describe an adult

Answer 2

1 cm

Abomasal surface

Question 3

Describe an egg

Answer 3

Thin shell

Oval

85 micro m

Question 4

Describe the life cycle

Answer 4

Direct

L3 do not survive on pasture

Adults live in abomasum

L3 enter abomasal glands - Emerge as adults

Question 5

What is the site of infection?

Answer 5

Abomasum

Question 6

Describe the Pathogenesis

Answer 6

Similar lesions to Ostertagia ostertagi, but LESS SEVERE clinical signs

Source of infection varies with conditions during the adverse period for larval survival

In very dry hot summer longevity of L3 reduced and mat acts as reservoir

Sheep feces less protection for L3

Changes occur in parasitized glands: Distend

 - Spread to non-parasitized glands
 - End result: Thickened Hyperplastic Gastric Mucosa

Raised nodule with visible central orifices

Very edematous

Necrosis and sloughing

Substantial leakage of endogenous protein

Question 7

Describe the clinical signs

Answer 7

Marked weight loss

Diarrhea - intermittent

Fluid feces

Profuse watery diarrhea - uncommon

Question 8

How do you diagnose?

Answer 8

Fecal egg counts

L3 identification

Plasma pepsinogen levels

Necropsy

Seasonality/Grazing History

Question 9

How do you treat?

Answer 9

MCLs

Benzimidazoles

Levamisole

Question 10

What is the common name?

Answer 10

Brown stomach worm