Strongyloides stercoralis (2)

Question 1

What is the common name?

Answer 1

Threadworms

Question 2

What are the hosts?

Answer 2

Dogs

Foxes

Cats

Question 3

Describe adults

Answer 3

Females reside in the small intestine

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

Question 4

Describe larvae

Answer 4

L1 have long esophagus - occupies 1/3 of body length

L1 can hatch rapidly - retrieved from feces

Question 5

Describe eggs

Answer 5

Eggs with L1 in feces

30 x 40 micro m

Seen in fecal

Question 6

Explain the life cycle

Answer 6

L3 infective

Transmission

 - Per os
 - Percutaneous 
 - Prenatal (rare, dogs)
 - Transmammary (primary)

Migrate to lungs, coughed, swallowed

Adult females in small intestine

PPP: 8-14 days

Alternate homogonic and heterogonic phases

Somatic stages

Males and females present in environment

Changes required to become infective

 - If dogs ate free-living L3 nothing would happen
 - Change must occur in order for L3 to be infective

Kennels/breeding facilities

Question 7

What is the site of infection?

Answer 7

Small intestine

Question 8

Describe the Pathogenesis

Answer 8

Inflammation in small intestine

Skin penetration erythematous reaction

Diarrhea

Urticaria

Question 9

How do you diagnose?

Answer 9

Fecal

Question 10

How do you treat and prevent?

Answer 10

Young animals

Dependent on host

Some immunity

Anthelmintics

Question 11

What is important about this parasite?

Answer 11

It is ZOONOTIC