PARA 410 Lecture Notes - Lecture 12: Ascaris Lumbricoides, Trichuris, Parasitism
12 Jun 2018
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Parasitology – lecture 12 (February 1st, 2018)
Review
- What is the third most common nematode in humans?
o Trichuris
- What is different about the morphology of the eggs of these nematodes?
o Bipolar plugs
- What is the most common human nematode infection in NA
o Pinworm
- What is special about their life cycle
o They do not necessarily go in the environment, there is contant autoinfection
- What is overall the most common and largest intestinal nematode of humans worldwide
o Ascaris lumbricoides
- What morphological feature of the adult worm is correlated with this species
o 3 lips
- What is the pathology of infection caused by the larval stages; why?
o Hemorrhages
o The migrating larvae are called
▪ Ocular larval migrant
Slide 1
- we take up the eggs to get infected (yesterday)
- infective larval stage:
o L3
- These are the only two ways to get infected by nematodes
Slide 4
- Actually the larval stage that infects, he noticed this my putting it on his skin
Slide 7
- We have them in Canada as well but we don’t have a lot of data of who is infected and where
Slide 14
- Hookworms have spicules to latch onto the female
Slide 15
- They are really attached to the mucous layer
- 10,000-25,000 eggs
Slide 20
- sometimes the larvae are migrating through our muscles and they become dormant – we don’t know why – but
even though we are the definitive host, they don’t complete their life cycle
- if it doesn’t do the transpulmonary… will not mature into the adult worm
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Document Summary
What is the third most common nematode in humans: trichuris. What is different about the morphology of the eggs of these nematodes: bipolar plugs. What is the most common human nematode infection in na: pinworm. What is special about their life cycle: they do not necessarily go in the environment, there is contant autoinfection. What is overall the most common and largest intestinal nematode of humans worldwide: ascaris lumbricoides. What morphological feature of the adult worm is correlated with this species: 3 lips. What is the pathology of infection caused by the larval stages; why: hemorrhages, the migrating larvae are called, ocular larval migrant. We take up the eggs to get infected (yesterday) infective larval stage: l3. These are the only two ways to get infected by nematodes. Actually the larval stage that infects, he noticed this my putting it on his skin.
