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Questions and Answers
Which of the following is NOT a class of helminths mentioned in the text?
Which of the following is NOT a class of helminths mentioned in the text?
Which type of body shape do most trematodes possess, according to the text?
Which type of body shape do most trematodes possess, according to the text?
What is the primary host for the evolutionary cycle of trematodes?
What is the primary host for the evolutionary cycle of trematodes?
Which helminth species frequently parasitizes herbivores, especially sheep and cattle?
Which helminth species frequently parasitizes herbivores, especially sheep and cattle?
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What do schistosomes have that most trematodes do not?
What do schistosomes have that most trematodes do not?
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How do humans usually become the primary hosts for Fasciola hepatica?
How do humans usually become the primary hosts for Fasciola hepatica?
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What is the length of the adult Fasciola hepatica worm?
What is the length of the adult Fasciola hepatica worm?
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Where do the adults of Fasciola hepatica parasitize?
Where do the adults of Fasciola hepatica parasitize?
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What is the main reservoir of infection for Fasciola hepatica?
What is the main reservoir of infection for Fasciola hepatica?
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How do humans become infected with Fasciola hepatica?
How do humans become infected with Fasciola hepatica?
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What is the typical pathogenesis of Fasciola hepatica infection in humans?
What is the typical pathogenesis of Fasciola hepatica infection in humans?
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What is the typical length of the oval, operculate eggs of Fasciola hepatica found in faeces?
What is the typical length of the oval, operculate eggs of Fasciola hepatica found in faeces?
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What is the recommended treatment for Fasciola hepatica infection?
What is the recommended treatment for Fasciola hepatica infection?
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What laboratory test is especially useful in the acute phase of Fasciola hepatica infection, before eggs appear in faeces?
What laboratory test is especially useful in the acute phase of Fasciola hepatica infection, before eggs appear in faeces?
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What is the incidence of Fasciola hepatica infection in humans over the past 20 years according to WHO (2021)?
What is the incidence of Fasciola hepatica infection in humans over the past 20 years according to WHO (2021)?
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What is the most common clinical presentation in infected individuals?
What is the most common clinical presentation in infected individuals?
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Study Notes
Helminths Classes
- Cestodes, Nematodes, and Trematodes are classes of helminths mentioned in the text.
Trematodes
- Most trematodes possess a flat, leaf-like body shape.
Trematodes Life Cycle
- The primary host for the evolutionary cycle of trematodes is usually a snail.
Fasciola Hepatica
- Fasciola hepatica frequently parasitizes herbivores, especially sheep and cattle.
- Humans usually become the primary hosts for Fasciola hepatica by ingesting contaminated water or plants.
- Adult Fasciola hepatica worms are approximately 2-3 cm in length.
- Adults of Fasciola hepatica parasitize the liver and bile ducts.
- The main reservoir of infection for Fasciola hepatica is infected snails.
- Humans become infected with Fasciola hepatica by ingesting metacercariae-contaminated plants or water.
- The typical pathogenesis of Fasciola hepatica infection in humans involves an acute phase with invasive symptoms, followed by a chronic phase with biliary symptoms.
- The oval, operculate eggs of Fasciola hepatica found in faeces are typically 130-150 μm in length.
- The recommended treatment for Fasciola hepatica infection is triclabendazole.
- The laboratory test especially useful in the acute phase of Fasciola hepatica infection is an ELISA for antibodies against Fasciola hepatica.
- According to WHO (2021), the incidence of Fasciola hepatica infection in humans has increased over the past 20 years.
- The most common clinical presentation in infected individuals is abdominal pain, fever, and liver dysfunction.
Schistosomes
- Schistosomes have a unique characteristic: they have a distinct, bifurcated tail in their cercarial stage, which most trematodes do not.
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Description
Test your knowledge of helminths classification with this quiz covering Platyhelminthes (flatworms - flukes and tapeworms) and Nematoda (roundworms) including various species of helminths.
