Strongyloides westeri (1)

Question 1

What is the common name?

Answer 1

Threadworms

Question 2

What are the hosts?

Answer 2

Equine

Question 3

Describe the adults

Answer 3

Adult females reside in small intestine

 - Slender, hairlike
 - Less than 1 cm
 - Have long esophagus - 1/3 of body length

Question 4

Describe the larvae

Answer 4

L1 have long esophagus - 1/3 of body length

L1 in feces - hatch rapidly

Question 5

Describe eggs

Answer 5

Eggs with L1 in in feces

30x40 micro m

Seen in fecal float

Question 6

Describe life cycle

Answer 6

Direct

L3 infective

Infect host:

 - Per os
 - Percutaneous 
 - Transmammary (4th day)

Stables; bedding; frenzy

Immunity (

Question 7

What is the site of infection?

Answer 7

Small intestine

Question 8

Describe the Pathogenesis

Answer 8

Female adults in small intestine cause inflammation

 - Diarrhea
 - Anorexia
 - Dullness
 - Weight loss

Heavy transmammary infections
- Death

Infection induces strong immunity

Skin penetrations by infective L3 causes an erythematous reaction and urticaria

Question 9

How do you diagnose?

Answer 9

Fecal Exam

Question 10

How do you treat and prevent?

Answer 10

Young animals

Anthelmintics

Dependent on host

Usually controlled with other parasites

Question 11

What is important about this parasite?

Answer 11

It is ZOONOTIC!