《人体寄生虫学 Human parasitology》课程教学课件（讲稿）Lectures 8 Ascaris

COMPARASONOFTHETWOTAPEWORMS:T. soliumT. saginataIntermediate Host:CattleSwine&Humans,Diseasecaused:Taeniasis&cysticercosisTaeniasis onlyInfective stage:Egg&Cysticercus,Cysticercus OnlyDiagnosis :Gravid proglottidGravid proglottidPerianal eggPerianal egg exam

COMPARASON OF THE TWO TAPEWORMS: T. solium T. saginata Intermediate Host: Swine & Humans, Cattle Disease caused : Taeniasis & cysticercosis, Taeniasis only Infective stage: Egg & Cysticercus, Cysticercus Only Diagnosis : Gravid proglottid, Gravid proglottid Perianal egg exam Perianal egg

Cysticercosis(T.solium)Cysticercosis:Itis caused bythecysticercusliving in human tissues. The cysticercusstage can be found anywhere in the bodyCysticercosis is divided into three types.(1)Subcutaneoustype(2)Oculartype(3)Braintype

Cysticercosis ( T. solium) Cysticercosis: It is caused by the cysticercus living in human tissues. The cysticercus stage can be found anywhere in the body. Cysticercosis is divided into three types. (1) Subcutaneous type (2) Ocular type (3) Brain type

EchinococcusgranulosusHydatid cyst cause echinococcosis,orhydatidosisAhepatic lesion may be asymptomaticforas long as 75years (66 %)Hydatidcystsgrowfasterinlung(22%)&brain(2%)secondaryinfectionrupture (secondarycyst,allergicreaction)

Echinococcus granulosus • Hydatid cyst cause echinococcosis, or hydatidosis • A hepatic lesion may be asymptomatic for as long as 75 years (66 %) • • Hydatid cysts grow faster in lung (22%) & brain (2%) • secondary infection • rupture ( secondary cyst, allergic reaction)

·Symptomsoccurdueto:Pressureeffect of theenlarging cyst:palpableabdominal mass, hepatomegaly,abdominal tenderness,portalhypertension and ascitesObstruction:Anaphylactic reactions:Cyst leakageorrupturemaybeassociatedwith a severe allergic reactionto hydatid fluidantigens;leading to hypotension, syncope andfever

• Symptoms occur due to: Pressure effect of the enlarging cyst: palpable abdominal mass, hepatomegaly, abdominal tenderness, portal hypertension and ascites Obstruction: Anaphylactic reactions: Cyst leakage or rupture may be associated with a severe allergic reaction to hydatid fluid antigens; leading to hypotension, syncope and fever

·Symptomsoccurdueto:Pressureeffect of theenlarging cyst:palpableabdominal mass, hepatomegaly,abdominal tenderness,portalhypertension and ascitesObstruction:Anaphylactic reactions:Cyst leakageorrupturemaybeassociatedwith a severe allergic reactionto hydatid fluidantigens;leading to hypotension, syncope andfever

• Symptoms occur due to: Pressure effect of the enlarging cyst: palpable abdominal mass, hepatomegaly, abdominal tenderness, portal hypertension and ascites Obstruction: Anaphylactic reactions: Cyst leakage or rupture may be associated with a severe allergic reaction to hydatid fluid antigens; leading to hypotension, syncope and fever

NEMATODAP161

NEMATODA P161

Characteristics of Class Nematoda1. Body is non-segmented and cylindrical in shape2. Two sexes are separated. is larger with a straight tail. is smaller with a curled.3. With a complete digestive tract.4. Life cycle: infective stage is embryonated egg or larva35. Most of the nematodes inhabitat in the intestine whilesome residein varioustissues

Characteristics of Class Nematoda 1. Body is non-segmented and cylindrical in shape. 2. Two sexes are separated. ♀is larger with a straight tail. ♂is smaller with a curled. 3. With a complete digestive tract. 4. Life cycle: infective stage is embryonated egg or larva3. 5. Most of the nematodes inhabitat in the intestine while some reside in various tissues

线虫Nemstode似蚓线虫（蛔虫）毛首鞭形线虫（鞭虫）蠕形住肠线虫（螃电）Ascaris lumbricoidesTrichuris trichiuraEnterobiusvermicularis丝虫钩虫旋毛形线虫（旋毛虫）FllariaHookwormTrichinella spiralis

AscarisScientific Name:lumbricoidesAscarisround wormp242 (p195)

Ascaris •Scientific Name: Ascaris lumbricoides •（round worm ）p242 (p195)

GeneralIntroductions:1. A the largest nematode residing in the small intestine2. Worldwide distributed with simple life cycle3. The most common helminth in human intestinal tract4. Domestic prevalence: Rural>Urban;Children>adults

General Introductions: 1. A the largest nematode residing in the small intestine. 2. Worldwide distributed with simple life cycle. 3. The most common helminth in human intestinal tract. 4. Domestic prevalence: Rural>Urban; Children>adults