Ascaris lumbricoides Flashcards
It is a large nematode and a primary causative agent of Ascaris in humans
Ascaris lumbricoides
Is the largest intestinal roundworm afftecting humans
Ascaris lumbricoides
Life cycle of Ascaris lumbricoides
- egg
- larva
- migration
- adult
The fertilized eggs are expelled in the __ of an infected host
feces
The egg of Ascaris lumbricoides embryonate under optimal conditions for approx. _ weeks
three
The __ is ingested by the host.
larvae
Once the larva is ingested by the host, the egg hatch in the _
duodenum
After the hatching, the larvae penetrate the ___ to enter to the lymphatic and circulatory system of the host. Then, they migrate from organ to organ
intestinal wall
In the lungs, the larvae ascend via __ , coughed up, swallowed, and return to the intestines.
Trachaea
During this part of the life cycle, the larvae molt multiple times before maturity
migration
The ___ live in the host’s small intestine which they can reside there for up to 2 years
adult worm
A female adult (A. lumbricoides) can produce up to ___ eggs daily which will eventually ho over with the cycle
200,000
What are the mode of transmission of A. lumbricoides?
- Fecal-oral route
- Inadequate sanitation
Adult worms consume nutrients from the intestines of the host. Lead to malnutrition and vitamin deficiencies
Nutritional impact
Larva migration can cause localized damage and inflammatory responses
Tissue damage
Symptoms caused by A. lumbricoides
- Abdominal pain
- Nausea and vomiting
- Diarrhea or constipation
- malnutrition
- Respiratory symptoms
Diagnosed for A. lumbricoides
- Stool sample
- Imaging tests (Xray, CT scan , Ultrasound, Endoscopy, MRI)
They are common in _ regions particulary in _ and the _ _
tropical; asia and western pacific
Who is at risk?
- preschool children
- school-aged children
- women of reproductive or pregnant stage
- adults in risky jobs ( tea-picking or mining)
Treatment for A. lumbricoides
- Albendazole
- Ivermectin
- Mebendazole
