蛔蟲鉤蟲蟯蟲ppt課件-wenkub
2023-01-30 21:26:54 本頁面
【正文】 t their ends N. americanus Difference between and N. americanus Morphology－ larva of hookworms rhabditiform Larva 桿狀蚴 filariform larva : infective stage Eggs are unembryonated when passed in the feces. Embryonation occurs in the soil. Unembryonated egg in feces broadly oval yellowish to brown in color Thick shell ovum protein coat fertilized Morphology－ Eggs of Ascaris lumbricoides unfertilized and fertilized egg Decorticated egg (lost outer albuminous coating) Embryonated egg in soil Morphology－ Eggs of Ascaris lumbricoides Morphology－ Eggs of Trichuris trichiura size: 5054 181。 female) Kinds of life cycle in nematodes Ascaris lumbricoides Trichuris trichiura Enterobius vermicularis Hookworms Indirect life cycle: intermediate host is necessary Trichinella spiralis Filaria Direct life cycle: Intermediate host is not necessary 土源性線蟲 （腸道線蟲） 生物源性線蟲 Pathogenesis 1)Larvae： ( 1) dermatitis caused by cutaneous invasion and subcutaneous migration of larva。 ( 2) injury to ans or tissues by migration of larvae in the body 2) Adults： (1) injury to intestinal mucosa caused by the parasites living in gastro intestinal system (2) injury to lymphatic system, muscles or nervous system caused by the parasites living in tissues What about Egg？ INTESTINAL HELMINTHS Ascaris lumbricoides (roundworm) 似蚓蛔線蟲 Trichuris trichiura (whipworm) 毛首鞭形線蟲 Enterobius vermicularis (pinworm) 蠕形住腸線蟲 Ancylostoma duodenale and Necator americanus (hookworms) 鉤蟲 2022年第二次寄調(diào) Ascaris lumbricoides (ascarids) Adults live in intestine of human, cause Ascariasis (蛔蟲病 )； Human is the only definitive host of this parasite. 1 billion world wide the infective rate in China % Hookworms Five species of hookworms: Ancylostma duodenale 十二指腸鉤口線蟲 Necator americanus 美洲板口線蟲 Ancylostma ceylanicum 錫蘭鉤口線蟲 A
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