Ascaridia galliAscaridia galli

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contents

8.Treatment and Control

2.Morphology

3.Life cycle

4.Epidemiology

1.Instroduction

7.Diagnosis

6.Lesions

5.Symptoms

9.References

2.Morphology

3.Life cycle

1.Instroduction

4.Epidemiology

2.Morphology

3.Life cycle

1.Instroduction

5.Symptoms

4.Epidemiology

2.Morphology

3.Life cycle

1.Instroduction

9.References

5.Symptoms

4.Epidemiology

2.Morphology

3.Life cycle

1.Instroduction

8.Treatment and Control

9.References

5.Symptoms

4.Epidemiology

2.Morphology

3.Life cycle

1.Instroduction

7.Diagnosis

6.Lesions

8.Treatment and Control

9.References

5.Symptoms

4.Epidemiology

2.Morphology

3.Life cycle

1.Instroduction

Introduction

Ascaridia galli is a parasitic roundworm（寄生蛔虫） belonging to the phylum Nematoda（线性动物门） .

Nematodes of the genus Ascaridia（禽蛔属）  are essentially intestinal parasites（肠道寄生虫） of birds.

A. galli is the most prevalent and pathogenic species （致病性） , especially in domestic fowl （鸡） .

It causes ascaridiasis, a disease of poultry （家禽） due to heavy worm infection, particularly in chicken and turkeys （火鸡） .

Ascaridia galli is a parasitic roundworm（寄生蛔虫） belonging to the phylum Nematoda（线性动物门） .

Nematodes of the genus Ascaridia（禽蛔属）  are essentially intestinal parasites（肠道寄生虫） of birds.

A. galli is the most prevalent and pathogenic species （致病性） , especially in domestic fowl （鸡） .

Ascaridia galli is a parasitic roundworm（寄生蛔虫） belonging to the phylum Nematoda（线性动物门） .

It causes ascaridiasis, a disease of poultry （家禽） due to heavy worm infection, particularly in chicken and turkeys （火鸡） .

Nematodes of the genus Ascaridia（禽蛔属）  are essentially intestinal parasites（肠道寄生虫） of birds.

A. galli is the most prevalent and pathogenic species （致病性） , especially in domestic fowl （鸡） .

Ascaridia galli is a parasitic roundworm（寄生蛔虫） belonging to the phylum Nematoda（线性动物门） .

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东北

西南

华北

华南华东

Morphology

头部顶端a prominent mouth which is surrounded by three large tri-

lobed lips.

Anterior end（前端）

Posterior end of female ( 雌虫尾部 )

Posterior end of male ( 雄虫尾部 )

10 Sex papilla( 性乳突 )There is a preanal sucker( 肛前吸盘 ) Before coacal pore( 泄殖孔 )

Anus( 肛门 ) at the end of the worm

There’s 2 ventral lip( 侧腹唇 ) ， esophagus( 食道 ) ， nerve ring( 食道环 )

Life cycle

Occasionlly ,earthworms become into storage host with swallowing  their eggs

Eggs containing infective larvae

Infective eggs

Adults Parasite in the stomach or small intestine

The development from egg to adult infectious need 5~8 weeks.

Adult life span of about 1 years

适宜环境：

3 周时间发育成含幼虫的感染性虫卵

Stomach( 胃 ) or small intestine( 小肠 )Duodenum

( 十二指肠 )Development for some time into the intestinal mucosa（进入肠黏膜发育一段时间）

Back to the intestine( 返回肠腔 ) Development

time( 发育一段时间 )

To be adult

( 成为成虫 )

Epidemiology

Ascaridia galli infection occurs in the rearing

chickens, and the chickens kept in cages Is less

common.

The nematode infects fowl of all ages, but the

chickens at three months of age is most

susceptible and the disease is more serious .

Symptoms

2

3

1

In severe infections, intestinal blockage can occur. Unthriftiness, drooping of the wings, bleaching of the head and emaciation. It also causes loss of blood, reduced blood sugar content, increased urates, shrunken thymus glands, retarded growth and greatly increased mortality.

Heavy infection is

the major cause of

weight depression

and reduced egg

production

in poultry

husbandry.

In heavy infections, adult worms may

move up the oviduct and be found in hens'

eggs, and sometimes they are also found

in the birds' feces.[11]

Lesions

At early phase of infection, the intestinal mucosa of chicken always appear bleeding or hyperaemia （充血、出血） and edema （水肿） .The larva （幼虫） forms parasitic tubercle in parasitic location, even arouse intestine rupture （肠破裂） , peritonitis  （腹膜炎） . By cutting intestinal tract, a large amount of parasites can be discovered. 

出血性肠炎 虫体聚集阻塞肠管

Depression( 精神沉郁 ) 、 pale mucosa( 黏膜贫血苍白 )

Disheveled feathers （羽毛蓬乱）、 Dysplasia （发育不良 ) 、 Slow( 行动迟缓 )

顽固性下痢

Diagnosis

Definite diagnosis : floating method with saturated salt solution ( 饱和盐水浮集法 )

or discovering large number of the

parasite（虫体） when cutting the small

intestine （小肠） at autopsy（剖检）

根据粪便中发现虫卵或剖检时在小肠内发现大量虫体

Treatment and Control

1 、 Treatment : praziquantel( 吡喹酮 )albendazole( 丙硫苯咪唑 )Fenbendazole( 芬苯达挫）

2 、 Comprehensive prevention( 综合性预防措施 ):IRegular de-worming Improvement of breeding and management .Improve hygiene and the resistance Harmless disposal of feces

References李国清 . 兽医寄生虫学 ( 双语版 ). 北京 : 中国农业大学出版社 ,2006

辛朝安 . 禽病学（第二版） . 北京：中国农业出版社

Ackert, JE (1940). "The large roundworm of chickens". Vet. Med. 35: 106–108

Ashour, AA (1994). "Scanning electron microscopy of Ascaridia galli (Schrank, 1788), Freeborn, 1923 and A. columbae (Linstow, 1903)". J Egypt Soc Parasitol 24 (2): 349–55.

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