Strongyloides ransomi (1)

Question 1

What is the host?

Answer 1

Swine

Question 2

Describe adults

Answer 2

Adult females reside in small intestine

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

Question 3

Describe larvae

Answer 3

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

L1 found in feces - hatch rapidly

Question 4

Describe eggs

Answer 4

Eggs with L1 in feces

30x40 micro m

Seen in fecal float

Question 5

Explain the life cycle

Answer 5

Direct

L3 infective

Infect host:

 - Per os
 - Percutaneously
 - Transmammary 

PPP: as short as 2 days

Arrest in somatic tissue - readily available for Transmammary infection

L3 migrate to heart, through lungs to trachea
- Swallowed, migrates to intestine

L1 and eggs with L1 in in found in feces

Free-living parasites

Question 6

What is the site of infection?

Answer 6

Small intestine

Question 7

Describe the Pathogenesis

Answer 7

Female adults in small intestine cause inflammation

 - Diarrhea
 - Anorexia 
 - Dullness 
 - Loss of weight

Heavy Transmammary infection
- Death

Infection induces strong immunity

Skin penetration by infective L3 causes an erythematous reaction and urticaria

Dehydration

Neonatal pigs may die before eggs excreted with feces

Immunity in older animals - not clinically affected

Question 8

How do you diagnose?

Answer 8

Fecal exam

Question 9

How do you treat and prevent?

Answer 9

Anthelmintics: MCLs

Good Hygiene

Young animals

Dependent on host

Question 10

What is the common name?

Answer 10

Threadworms