Strongyles 2

Question 1

What species are large strongyles?

Answer 1

Strongylus spp.

Question 2

What are examples of strongylus species and their size?

Answer 2

S. edentatus, S. equinus = 2.5-5cm
S. vulgaris = 1.5-2.5cm

Question 3

What is the life cycle of a large strongyle?

Answer 3

*Direct
*Migratory
*Eggs develop to L3 on pasture -Typical strongyle eggs
*L3 Migrate to mesenteric arteries, liver, pancreas + hepatic ligaments
*Mature to adults in lumen of large intestines

Question 4

What species of strongyle migrate to cranial mesenteric arteries? What is its PPP?

Answer 4

S. vulgaris
PPP = 6 months

Question 5

What species of strongyle migrates to the liver and then to the pancreas?
What is its PPP?

Answer 5

S. equinus
PPP = 8 months

Question 6

What species of strongyle migrates to the flanks and hepatic ligaments?
What is its PPP?

Answer 6

S. edentatus
PPP = 10 months

Question 7

How are the strongyles identified?

Answer 7

X40 magnification - buccal cavity seen

Question 8

What causes disease with large stongyles? What species causes most disease?

Answer 8

Larvae migrating - S. vulgaris is most significant in term of disease

Question 9

What can migrating L4 of strongylus vulgaris cause?

Answer 9

Non-strangulating infarction in cranial mesenteric arteries

Question 10

What worm may contribute to damage caused by other worms but rarely pathogenic on their own? What size are their eggs?

Answer 10

Triodontophorus spp
*Eggs = 2x size of other strongyle eggs