Strongyloides stercolaris

Question 1

The smallest nematode to infect human and Also known as Threadworm

Answer 1

> Strongyloides stercolaris

Question 2

Female is classified as ___________ Natural form of asexual reproduction in which the embryos develop in the absence of fertilization

Answer 2

> Parthenogenic

Question 3

Give the Pathogenicity of Strongyloides stercolaris

Answer 3

1. Strongyloidosis or Vietnam Diarrhea
   or Cochin China Diarrhea
2. Racing larva or Larva currens
   - After skin penetration of
   filariform larva
3. Autoinfection
   - Hand to mouth
4. Bronchopneumonia
   - Larva of S. stercoralis is seen (lung mifration)
5. Sputum

Question 4

Give the Laboratory Diagnosis for Strongyloides stercolaris

Answer 4

1. Stool or Duodenal Aspirates
2. Concentration method
   - Zinc Sulfate Floatation Mtd
3. Stool Culture
   - Harada mori
   - Baermann Technique
4. ELISA
5. CBC
6. Beale String Test

Question 5

Give the “Direct” process of Strongyloides stercolaris

Answer 5

> Same with hookworm but filariform larva will survive into the soil after few weeks have development
May hatch in the stool because eggs are occasionally found in stool
specimen
Filariform larva may
survive in soil for weeks

Question 6

Give the Indirect / Free living process for Strongyloides stercolaris

Answer 6

> Filariform larva in the soil can become free living male and female proceed to hatching of eggs
Happens in the soil
They can produce
filariform directly into the soil

Question 7

Give the Autoinfection of Strongyloides stercolaris

Answer 7

> Rhabditiform larva may
transform to filariform larva and penetrate the perianal region or undergoes heart
to lungmigration

Question 8

Give the Ova Morphology of Strongyloides stercolaris

Answer 8

• Smaller than Hookworms
• Well-developed larva
• Rarely seen in stool
• “Chinese Lantern Ova”

Question 9

Give the difference between Hookworm and Strongyloides
Stercoralis in terms of their esophagus

Answer 9

1.Hookworm
- Shorter
2. Strongyloides
Stercoralis
- Longer

Question 10

Give the difference between Hookworm and Strongyloides
Stercoralis in terms of tail

Answer 10

1. Hookworm
   - Pointed Tail
2. Strongyloides
   Stercoralis
   - Notched Tail End

Question 11

Give the difference between hookworm and Strongyloides
Stercoralis in terms of Sheath

Answer 11

1. Hookworm
   - With
2. Strongyloides
   Stercoralis
   - Without