Medical Parasitology Lecture 5 - Life Cycle of Trematodes (Flashcards)

Fill in the blank flashcards for key terms and concepts in Medical Parasitology.

All trematodes of man belong to the Class __ and subclass Digenea.

Trematoda

Trematodes cause __ losses.

economic

The eggs of trematodes are operculated except for __.

schistosomes

Sexual generation of trematodes often occurs in a __ host.

definitive (Mammalian)

Asexual generation of trematodes occurs in __ hosts.

intermediate

__ is also known as the giant intestinal fluke.

Fasciolopsis buski

__ is also known as the Chinese liver fluke.

Clonorchis sinensis

The causative agent of fascioliasis is __.

Fasciola hepatica

__ causes hepatic fibrosis in ruminants and humans.

Fasciola hepatica

The seven different developmental stages of Fasciola hepatica are: eggs, miracidia, sporocysts, rediae, cercariae, metacercariae, and __.

adult flukes

Eggs of Fasciola hepatica are operculate, __ and ovoid.

brown

__ are pyriform motile larval stages of Fasciola hepatica covered with cilia.

Miracidia

Mature __ of Fasciola hepatica (~0.5mm long) are free-swimming stages.

cercariae

Mature flukes of Fasciola hepatica are __-shaped.

leaf

Immature flukes of Fasciola hepatica infect the liver __.

parenchyma

Halzoun occurs when an individual consumes infected __ liver.

raw

__ is a preferred antihelminthic agent against Fasciola hepatica.

Triclabendazole

Schistosomiasis is second only to __ in terms of public health importance.

malaria

__ is a species of Schistosoma found in Africa.

Schistosoma haematobium

__ is a species of Schistosoma found in Latin America, Africa, and the Middle East.

Schistosoma mansoni

__ is a species of Schistosoma found in East Asia.

Schistosoma japonicum

The infective stage of Schistosomiasis is __.

cercariae

The infective route of Schistosomiasis is by __.

skin

The eggs are the main __ stage of Schistosomiasis.

pathogenic

__ eggs have a spike at the tip.

S. haematobium

__ eggs are small and almost spherical with a tiny spine.

S. japonicum

__ eggs have a spike on the side (spine).

S. mansoni

__ membrane filtration system is used for diagnosis of Schistosomiasis in urine.

Nucleopore

__ is a technique used for diagnosis of Schistosomiasis in stool.

Kato-Katz

The most frequently used technique nowadays is __ , but antibody levels generally do not differentiate between past and present infection and do not give any information about intensity of infection.

ELISA

__ is a broad-spectrum antihelminthic drug used to treat Schistosomiasis.

Praziquantel

__ is effective against S. haematobium.

Metrifonate

__ is effective against S. japonicum.

Niridazole

__ is effective against S. mansoni.

Oxamniquine

Fasciolopsiasis is caused by infection with the intestinal fluke __.

Fasciolopsis buski

The infective stage of Fasciolopsiasis is __ encysted on water plants.

metacercariae

In man, Fasciolopsis buski inhabits the __.

Small intestines

__ is the Segmentina spp of snail that serves as intermediate host to Fasciolopsis buski.

Segmentina spp

Paragonimiasis is caused by infection with the lung fluke __.

Paragonimus westermani

The infective stage of man is __ encysted in crustacean

metacercariae

The Paragonimus westermani inhabits the __ in humans.

Lungs

Time from infection to oviposition (egg laying) is __ days in Paragonimus westermani.

65 to 90

__ and _ serve as intermediate host for Paragonimus westermani .

Snails; Stream crabs

Drug of choice for treatment for Paragonimus westermani is __.

praziqantel

Clonorchiasis is caused by infection with the parasite of biliary passage __.

Clonorchis sinensis

In Clonorchis sinensis, the infective stage for man is __ encysted in fish.

metacercariae

The Clonorchis sinensis inhabits the __ in humans.

Hepatic bile duct

In Clonorchis sinensis, the metacercariae make their way to the liver, not the coelom, but by direct migration up the __ duct.

hepatic bile

__is prescribed to cure patients & carrier of Clonorchiasis sinensis infection.

Praziquantel

Intermediate hosts for Clonorchis sinensis are and

Snails; Freshwater fish