Definitive host,man Bear--a dead-end host Egg passed with feces Embryonates in water !8联东 usfifiicS Hatches Perch eaten by carnivorous fish Free-swimming Plerocercoid coracidium forms in viscera eaten by copepod Procercoid eaten with copepod by planktivorous Hexacanth reaches fish hemocoel of copepod FIGURE 23.5 Life cycle and epidemiology of Diphyllobothrium latunt
Larvae of Diphyllobothrium latum(廣節裂頭絛蟲的幼蟲) 1'st Intermediate Host Copepods:Diaptomus spp Cyclops spp.’etc, O2'nd Intermediate Host Fresh-brakish Water Fishes Salmonoid fishes(觟) Perch(鱸)~Burbot(江)、 Pike(梭子)~Trout(鳟)，etc E8- Plerocercoid in fish (b 盧老節 畏是幼盘x50 教學拥 PROCERCOID原尾坳 PLEROCERCOIDS裂头坳 CYSTICERCOID囊尾蚴
TAENIA SAGINATA AND TAENIA SOLIUM 牛猪肉绦虫 Life cycle requires two vertebrates to complete the life cycle x Infection occurs when eat uncooked tissue,or with Taenia solium when ingest eggs Humans are definitive hosts +Can be intermediate host for Taenia solium x Cattle and swine are intermediate hosts
Life cycle requires two vertebrates to complete the life cycle Infection occurs when eat uncooked tissue, or with Taenia solium when ingest eggs Humans are definitive hosts Can be intermediate host for Taenia solium Cattle and swine are intermediate hosts