Life cycle Cercariae invade the crustacean and encyst into metacercariae △ Infective Stage 魯-國 A porocysts Rediae Cercariae Humans inges cooked or pickled crustaceans containing Excyst in Miracidia hatch and penetrate snail Adultsin cystic cavities in lungs lay eggs which are excreted 2 Embryonated eggs in sputum A Alternately eggs Unembryonated eggs are swallowed and passed with stoolLife cycle