Fasciolopsis buski
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FASCIOLOPSIS BUSKI. Introduction. Fasciolopsis buski is known scientifically as the largest intestinal fluke in humans.Infection occurs primarily in Asia and the Indian subcontinent, especially in area where humans raise pigs and consume freshwater plants, so this helminth is also

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FASCIOLOPSIS BUSKI

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Fasciolopsis buski

FASCIOLOPSIS BUSKI


Fasciolopsis buski

Introduction

Fasciolopsis buski is known scientifically as the

largest intestinal fluke in humans.Infection occurs

primarily in Asia and the Indian subcontinent,

especially in area where humans raise pigs and

consume freshwater plants, so this helminth is also

named as “giant Asian intestinal fluke”.This giant

parasite has even been described as “meat worm”

or “reddish worm” in traditional Chinese medical book.


Fasciolopsis buski

I. Morphology

(1) Adult

  • Long elliptic, flesh-colored, looks like

  • a slice of raw meat

  • The size: 20-75×8-20×0.5-3mm

  • The ventral sucker (filler-like

  • / infundibular ) is larger and near by the

  • much smaller oral sucker

  • Two coral-liked(珊瑚) testes are located

  • in the posterior half of the body

No seminal receptacle


Fasciolopsis buski

ventral sucker is 3-4 times larger than oral sucker

oral sucker

uterus

cecum

ovary

vitellaria

testes


Fasciolopsis buski

(2) Egg

The thinner shell with an operculum

(not so obvious)

encloses an ovum

and 20-40 yolk cells

Slightly yellow in color

130-140×80-85µm (the largest helminth egg)

Oval / long elliptic in shape


Fasciolopsis buski

The first intermediate host:

Segmentina


Fasciolopsis buski

water caltrop水红菱

茭白cane shoot

Water chestnut荸荠

The second intermediate host:

Aquatic plant vector


Fasciolopsis buski

II. Life cycle

  • Site of inhabitation: small intestine,

  • 2. Infective stage: metacercaria,

  • 3. Infective route and mode: eating raw water

  • plants with metacercariae,

  • 4. Intermediate hosts: Planorbis snail,

  • 5. Reservoir hosts: pig,

  • 6. Life span: 1-4 years,

  • 7. Egg output: 15,000/worm/day.


Fasciolopsis buski

Adolescent Adult Eggs

Duodenum In Human Body

3 monthsare discharged

man eats metacercariae in feces

on raw water plants

────────────────────────────

Metacercaria Eggs get into water

encystations on theIn Water25-30℃

surface of water plants2-3 months3-4weeks

Miracidiahatch out

invades

Many cercaria asexual reproduction Planorbis snail

Many daughter rediae Many mother rediae Sporocysts


Fasciolopsis buski

III. Pathology and Symptomatology

  • The enteritis due to worms’ adhesion manifests abdominal discomfort and

  • diarrhea.

  • 2. Malnutrition results from the worms

  • sharing food with the host and diarrhea.


Fasciolopsis buski

IV. Diagnosis

Stool examination:

1. Direct fecal smear,

2. Water sedimentation method


Fasciolopsis buski

V. Treatment and Prevention

1. The treatment of the patients, carriers and pigs

Drug of choice is praziquantel. Other effective

drugs include hexachloroparaxylene, bithionol (bitin).

The drug for pig is dipterex (敌百虫).

2. Prevention

(1) Health education

(2) Deal with night soil.

(3) Avoid feeding pigs on raw water plants


Fasciolopsis buski

VI. Epidemiology

This disease is prevalent in Southeast

Asia,China, Japan, Korea, Thailand, Burma, Kampuchea, Vietnam, Bangladesh, Philippines,Indonesia, Malaya and India

. In China it is found in 18 provinces, city and

autonomic region except north and west regions.

The prevalence of fasciolopiasis is relative to growing water plants and feeding pigs

on water plants.


Fasciolopsis buski

Thank you !


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