蛔蟲(chóng)鉤蟲(chóng)蟯蟲(chóng)ppt課件-閱讀頁(yè)
2025-01-30 21:26本頁(yè)面
【正文】 size: smaller than Ascarids’ Shape： oval, flattened on one side Color： colorless Shell： quite thick Contains： an undeveloped larva inside Shape: ovalround Shell: thin with smooth and colorless (transparent) eggshell Size: 5776 181。m Contains: clear space between the eggshell and the ovum. Usually 2 to 16 cells in feces Morphology－ Eggs of hookworms Morphology－ Eggs of hookworms Life cycle Life cycle of Ascaris lumbricoides Adult egg infective egg larva Ingested by man migration Life cycle Migration of larva in the host: Vessels of intestine liver heart lungs trachea pharynx intestine (swallowed) Life cycle of hookworm Life Cycle Adult egg rhabditiform filariform larva larva Swallowed pharynx trachea lung circulation Perate skin Life cycle of Enterobius vermicularis Life cycle ingested Adult egg infective egg (in lumen of cecum) Pathogenesis Pathogenesis of Ascaris lumbricoides 1) larvae: Ascaris Pneumonitis Asthma Larva in section of lung Pathogenesis 2) Adults： (1) Malnutrition (2) Disorder of digestive system: main plaint abdominal pain (3) Allergic responses anorexia (食欲不振 ) nausea (惡心 ) vomiting (嘔吐 ) diarrhea (腹瀉 ) Complication 并發(fā)癥 perate to bile ducts perate to the pancreatic and the appendix 膽道蛔蟲(chóng)癥 胰腺 闌尾 intestinal obstruction 腸梗阻 Ectopic parasitism 異位寄生 1. cause irritation( pruritus 搔癢 ) of the anal region Secondary bacterial infection in areas scratched raw may occur. 2. vaginitis and rarely salpingitis in young girls. 陰道炎 輸卵管炎 3. cause mental anguish Pathogenesis of Enterobius vermicularis Pathogenesis of hookworm 1. Local dermatitis (ground itch) 鉤蚴性皮炎 (pneumonialike) symptoms (symptoms are not as severe as Ascaris migration) 3. Anemia a. The worm sucks blood and the wound oozes blood A. duodenale takes ml/da
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