2 General charactersAll tape worms consist of long, multi-segmented body.Cuticle of the body is provided with pores through which the worm takes its nutrients (no digestive system)They are hermaphroditic.The adult worm is divided into 3 distinct parts:Head (scolex),neckstrobilla1. Head or scolex : usually provided with muscular suckers and crown of hooks (rostellum) to attach to intestinal wall.
3 General characters cont. 2.Neck3. Strobilla: the long segmented body consists of segments of three types(i) the immature segments: which follow the neck region(ii) the mature segments: containing both sex organs and are responsible for reproduction(iii) the gravid segments: filled with fertilized eggs.Eggs :contain hexacanth embryoAll worms have intermediate host except Hymenolipis nana
4 Examples of class cestoda 1- Taenia sp:Taenia saginataTaenia solium2- Hymenolepis sp:Hymenolepis diminuta3- Dipylidium caninum4- Echinococcus granulosus
6 Taenia saginata cont. Location of adult: Small intestine of man Intermediate host : CattleInfective stage : Cysticercus bovisMode of transmission: Eating insufficiently cooked meat containing cysticercus bovisDiagnosis: Eggs & gravid segments in stoolDisease: Taeniasis
7 2. Hymenolepis diminuta (rat tape worm) Mature segments: broad than long characterized by 3 testis and one ovary in each segment (4X)Gravid segments : broad than long, enlarged uterus containing eggs (4X)
8 2.Hymenolepis diminuta cont. Location of adult: Small intestine of rat occasionally manIntermediate host: Rat fleaInfective stage: CysticercoidMode of transmission: Ingestion of rat flea containing cysticercoidDiagnosis: Eggs and gravid segments in stoolDisease: Hymenolepiasis
9 3. Dipylidium caninum (dog tape worm) Mature segments: longer than broad,2 genital pores, testis and ovaries (4X)Gravid segments: Longer than broad, wall deformed, enlarged uterus filled with eggs (4X)
11 Dipylidium caninum cont. Location of adult: Small intestine of dogs, occasionally manIntermediate host: Dog fleaInfective stage: CysticercoidMode of transmission: Ingestion of dog flea containing cysticercoidDiagnosis: Egg packet in stoolDisease: Dipylidium caninum infection
12 4. Echinococcus granulosus Adult worm:scolex, immature, mature and gravid segments (4X)Scolex from hydatid sand (H.P)
13 Echinococcus granulosus cont. Location of adult: Small intestine of dogsLocation of hydatid cyst : Liver, lung, CNS and bone in man, cattle and sheepIntermediate host : Cattle, sheep (man is an end stage intermediate host)Infective stage: Eggs in fecesMode of transmission: Man is infected by ingestion of eggs in dog fecesDiagnosis: Identification of hydatid cyst by X rayDisease: Hydatid disease
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