Deck 55: Liver and Lung Trematodes

Question 1

The adult worm of Fasciola measures 2 to 5 cm by 0.8 to 1.3 cm with a cephalic cone at the anterior end that contains the oral sucker.The drug of choice to treat Fasciola infections is:

A)praziquantel.
B)triclabendazole.
C)albendazole.
D)benzimidazole.

Answer 1

B
The adult worm of Fasciola measures 2 to 5 cm by 0.8 to 1.3 cm with a cephalic cone at the anterior end that contains the oral sucker.The eggs measure 130 to 150 µm by 70 to 90 µm and are operculated,brownish-yellow,and unembryonated when they leave the body.The drug of choice for Fasciola is triclabendazole.

Question 2

Which second intermediate host ingests the cercariae of Clonorchis and Opisthorchis?

A)Snail
B)Crustacean
C)Copepod
D)Freshwater fish

Answer 2

D
The cercariae of Clonorchis and Opisthorchis are ingested by a second intermediate host,a freshwater fish.

Question 3

MATCHING
Match the fluke classification with the corresponding organism.
a.O.viverrini
b.Fasciola spp.
c.C.(Opisthorchis)sinensis
d.P.westermani
Southeast Asian liver fluke

Answer 3

A

Question 4

MATCHING
Match the fluke classification with the corresponding organism.
a.O.viverrini
b.Fasciola spp.
c.C.(Opisthorchis)sinensis
d.P.westermani
Sheep liver fluke

Question 5

MATCHING
Match the fluke classification with the corresponding organism.
a.O.viverrini
b.Fasciola spp.
c.C.(Opisthorchis)sinensis
d.P.westermani
Chinese liver fluke

Question 6

Charcot-Leyden crystals are often observed in specimens infected with which one of the following trematodes?

A)Clonorchis (Opisthorchis)sinensis
B)Opisthorchis viverrini
C)Fasciola hepatica
D)Paragonimus westermani

Question 7

The eggs of Paragonimus mexicanus measure approximately 80 µm by 40 µm,are unembryonated and operculated,and have thick shells that are brownish-yellow.An individual with this infection has most likely traveled to which endemic area?

A)Japan
B)Africa
C)New Guinea
D)South America

Question 8

MATCHING
Match the fluke classification with the corresponding organism.
a.O.viverrini
b.Fasciola spp.
c.C.(Opisthorchis)sinensis
d.P.westermani
Lung fluke