Helminths > Trematodes > Faschiolopsis

Morphology

Diagnosis

Life cycle

Epidemiology

Symptom

Prevention

Morphology 1. Adult • reddish yellow when alive; grayish white when dead. •Look like a large peace of ginger. • 20~75×8~20 mm, the largest trematode • The Ventral sucker is 4 times larger than the oral sucker.

2.Egg • Oval, slightly yellow ，

• The largest egg of human parasites •Having a thin egg shell with a small operculum. •Inside the egg shell, there is an embryonic cell and 20~40 yolk cells.

Life cycle

Adult Man,pigs

egg

Feces

Water

1~2 月

M.

S.

M.R.

D. R.

Snail

Adult

Man Pig

M.C . Plants in water

C.

Important points 1. Where the adults live ? 2. The intermediate host ： 3. Infective stage ： 4. Modes of infection:

Symptoms The adults cause disease named fasciolopiasis. Abdominal pain, diarrhea, weakness, emaciation, dystrophia,retarded growth, etc.

Diagnosis

Epidemiology 1. Distribution • Tropic and subtropic area of Asia • 18 provinces in China • Very rare in Henan province

2. Factors for endemic • Sources of infection ： infected man and pig • Water contamination with feces • Snails and plants existence in water • The plants used as fertilizer for raising pigs • The habits of ingestion of raw plant or drinking unboiled water

Treatment and prevention • Treat the patients: Praziquantel • Not eat raw hydrophytes without washing • Not drink unboiled water • Not use raw water plants as fertilizer of pigs

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Oral sucker Ventral sucker

uterus ovary

Intestine Testes

Adults of F. buski

Adults of F. buski Back

Egg of F. buski Operculum Embyonic cell Yolk cells Egg shell

Back

水芹菜

浮萍

菱角

水浮莲

Water plants usually found in ChinaBack

The intermediate host of F. buski

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