Question 1

MATCHING&#10;Match the fluke classification with the corresponding organism.&#10;a.Opisthorchis viverrini&#10;b.Fasciola spp.&#10;c.Clonorchis (Opisthorchis) sinensis&#10;d.Paragonimus westermani&#10;Chinese liver fluke

Accepted Answer

Chinese liver fluke refers to Clonorchis (Opisthorchis) sinensis.

Question 2

MATCHING&#10;Match the fluke classification with the corresponding organism.&#10;a.Opisthorchis viverrini&#10;b.Fasciola spp.&#10;c.Clonorchis (Opisthorchis) sinensis&#10;d.Paragonimus westermani&#10;Southeast Asian liver fluke

Accepted Answer

O.viverrini is the correct classification for the Southeast Asian liver fluke.

Question 3

The eggs of Paragonimus mexicanus measure approximately 80 microns by 40 microns, 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

Accepted Answer

Paragonimus is found primarily in the Far East (China, Japan, Korea, Manchuria, Papua New Guinea, and Southeast Asia), and certain species such as P.mexicanus are found in areas of Mexico and South America.The eggs of P.westermani measure 80 to 120 microns by 45 to 60 microns, and those of P.mexicanus are approximately 80 microns by 40 microns.The eggs are unembryonated when they leave the body, operculated with opercular shoulders, thick shelled, and brownish yellow.

Question 4

Charcot-Leyden crystals are often observed in specimens infected with which one of the following trematodes?&#10;A) Clonorchis (Opisthorchis) sinensis&#10;B) Opisthorchis viverrini&#10;C) Fasciola hepatica&#10;D) Paragonimus westermani

Accepted Answer

Charcot-Leyden crystals are often observed in specimens infected with Paragonimus westermani, a trematode commonly known as the lung fluke. These crystals are thought to be formed from breakdown products of eosinophils and are commonly seen in samples from patients with parasitic infections associated with eosinophilia. Clonorchis sinensis and Opisthorchis viverrini are liver flukes, while Fasciola hepatica is a fascioloid trematode.

Question 5

MATCHING&#10;Match the fluke classification with the corresponding organism.&#10;a.Opisthorchis viverrini&#10;b.Fasciola spp.&#10;c.Clonorchis (Opisthorchis) sinensis&#10;d.Paragonimus westermani&#10;Lung fluke

Accepted Answer

P.westermani is the lung fluke.

Question 6

Which second intermediate host ingests the cercariae of Clonorchis and Opisthorchis?&#10;A) Snail&#10;B) Crustacean&#10;C) Copepod&#10;D) Freshwater fish

Accepted Answer

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

Question 7

MATCHING&#10;Match the fluke classification with the corresponding organism.&#10;a.Opisthorchis viverrini&#10;b.Fasciola spp.&#10;c.Clonorchis (Opisthorchis) sinensis&#10;d.Paragonimus westermani&#10;Sheep liver fluke

Accepted Answer

Sheep liver fluke refers to Fasciola hepatica or Fasciola gigantica, both of which belong to the family Fasciolidae. Opisthorchis viverrini, Clonorchis sinensis, and Paragonimus westermani belong to different families (Opisthorchiidae and Paragonimidae, respectively) and do not match the classification of sheep liver fluke.

Question 8

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:&#10;A) praziquantel.&#10;B) bithionol.&#10;C) albendazole.&#10;D) benzimidazole.

Accepted Answer

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 microns by 70 to 90 microns and are operculated, brownish-yellow, and unembryonated when they leave the body.The drug of choice for Fasciola is bithionol administered orally every other day for 10 to 15 doses.

Deck 56: Liver and Lung Trematodes