Basic principles of parasitiology and biology of helminths - helminth parasites
4 important questions on Basic principles of parasitiology and biology of helminths - helminth parasites
What is the difference in the way trematodes, cestodes and nematodes eat?
Life cycle of treamatodes:
- Schistosomiasis are the most damaging parasite infection.
- Chronic disease is caused by eggs trapped in the liver and other organs. Eggs migrate to the portal blood in the liver and mature.
- There is an immune response against egg antigens.
- Adults do not cause direct pathology in definitive host -> eggs cause inflammatory responses by antigenic egg shells -> soluble egg antigens leak from the eggs
- strong granulomatous inflammation and fibrosis/necrosis
Reproduction strategies of Trematodes:
- Self fertilization (fasicola hepatica)
- cross fertilization (paragonimus)
- fertilization between opposite sexes (schistosomes)
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Life cycle of nematodes:
J1. Intestine
J2. Bloodstream, liver
J3.
J4. Heart, lungs
Adult. Mouth, intestine
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