Life cycle The basic generation-cycle: cyst lumen trophozoites-cyst o Trophozoites may invade intestine and spread Cyst formation -essential factors enviroment time Infective cysts and trophozoites pass in fecesLife cycle • The basic generation-cycle: cyst – lumen trophozoites – cyst • Trophozoites may invade intestine and spread • Cyst formation – essential factors: enviroment + time • Infective cysts and trophozoites pass in feces