Trematodes: General Characteristics

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What type of host do all parasitic trematodes require?

Freshwater fish

Birds

Freshwater snails (correct)

Insects

What is the characteristic shape of trematodes?

Round

Long and thread-like

Cylindrical

Flat and leaf-like (correct)

What is the larval stage of a fluke that swims about seeking out a snail to serve as an intermediate host?

Sporocyst

Cercaria

Metacercaria

Miracidium (correct)

What species of snail serves as the intermediate host for Schistosoma mansoni?

Biomphalaria Signup and view all the answers

What is the exception to the rule that all Trematoda are hermaphrodite?

Schistosoma spp. Signup and view all the answers

What is the habitat of Fasciolopsis buski?

Small intestine Signup and view all the answers

What is the intermediate host of Fasciolopsis buski?

Freshwater snails Signup and view all the answers

What is the diagnostic stage of Fasciolopsis buski?

Egg in stool Signup and view all the answers

What is the route of infection of Fasciolopsis buski?

By ingesting metacercariae on aquatic plants Signup and view all the answers

What is the infective stage of Fasciolopsis buski?

Metacercariae Signup and view all the answers

What is the characteristic of the sexes of Fasciolopsis buski?

Hermaphrodite (monoecious), the sexes not separated Signup and view all the answers

What is a characteristic that distinguishes Schistosoma spp from other trematodes?

The sexes are separate into male and female Signup and view all the answers

What is true about the life cycle of trematodes?

They require a snail to serve as an intermediate host Signup and view all the answers

What is a common characteristic of trematodes?

They are leaf-like worms Signup and view all the answers

What is a characteristic of Fasciolopsis buski?

It is also known as the giant intestinal fluke Signup and view all the answers

What is true about the infective stage of Schistosoma spp?

It is the cercariae stage Signup and view all the answers

What is a difference between Schistosoma spp and other trematodes?

Schistosoma spp are diecious, while other trematodes are monoecious Signup and view all the answers

Which of the following symptoms is NOT a result of the host's inflammatory response to Schistosoma japonicum eggs?

Gastrointestinal tract (GIT) inflammation Signup and view all the answers

Which stage of the Schistosoma japonicum life cycle is responsible for direct skin penetration and infection?

Cercariae Signup and view all the answers

What is the shape of the egg of Schistosoma japonicum?

Oval with a lateral spine Signup and view all the answers

Which of the following is NOT a habitat of Schistosoma japonicum?

Veins surrounding the large intestine Signup and view all the answers

What is the treatment for intestinal Schistosomiasis caused by Schistosoma japonicum?

Praziquantel Signup and view all the answers

Which species of Schistosoma causes urinary Schistosomiasis?

Schistosoma haematobium Signup and view all the answers

Where do fertilized eggs penetrate to enter the intestine or bladder?

Vascular walls Signup and view all the answers

What is the final, free-swimming larval stage of the parasite?

Cercaria Signup and view all the answers

Where does the mating of male and female schistosomes take place?

Intestine Signup and view all the answers

What is one way to control and prevent schistosomiasis?

Eradicating mollusks Signup and view all the answers

Which of the following is NOT a way to control and prevent schistosomiasis?

Eating contaminated food Signup and view all the answers

What happens to the cercaria in the freshwater environment?

They are released into the fresh water Signup and view all the answers