Liver and Lung Trematodes

Question 1

Trematodes that reside in the biliary duct (liver) of humans

Answer 1

1. Clonorchis spp.
2. Opisthorchis spp.
3. Fasciola spp.

Question 2

Trematodes that reside in the lungs and other body sites

Answer 2

1. Paragonimus spp.

Question 3

Adult trematodes live in the biliary ducts and may also be found in _ in heavy infections

Answer 3

gallbladder

Question 4

Also known as the Chinese liver fluke

Answer 4

Clonorchis sinensis

Question 5

Also known as South-east asian liver fluke

Answer 5

Opisthorchis viverrini

Question 6

All liver flukes require a _ as an intermediate host

Answer 6

Freshwater snail

Question 7

Fasciola spp. occurring in Europe, North and South America

Answer 7

F. hepatica

Question 8

Fasciola spp. occurring in Asia and Africa

Answer 8

F. gigantica

Question 9

The cercariae of _ are ingested by a second intermediate host (a freshwater fish)

Answer 9

Clonorchis and Opisthorchis

Question 10

Infective stage of liver trematodes in humans

Answer 10

Metacercaria

*liver trematodes have a similar life cycle w/ intestinal trematodes

Question 11

Liver trematodes are capable of producing _

Answer 11

Jaundice

Question 12

Most common and widely distributed lung fluke

Answer 12

Paragonimus westermani

Question 13

Samples suspecting Paragonimus westermani infection may be obtained from:

Answer 13

1. Sputum (blood-tinged sputum & charcot-leyden crystals)

2. Feces

Question 14

Food source of fasciola, chlonorchis, opisthorchis and paragonimus spp.

Answer 14

Fasciola : fresh water vegetation

Clonorchis & Opisthorchis: Freshwater fish

Paragonimus: Freshwater crabs / crayfish

Question 15

P. westermanii encapsulate in the _ in pairs

Answer 15

lungs

Question 16

A 50-y/o male visiting from Japan complained of fever, abdominal pain, and jaundice. Blood work showed a slight increased bilirubin level. The parasite examination showed small, oval operculated eggs, with opercular shoulders and a knob on the opposite end. What is the parasite?

Answer 16

Clonorchis / Opisthorchis

> They have opposite end knob