Adults release fully embryonated eggs each with a fully-developed miracidium, and eggs are passed in the host’s feces. After ingestion by a suitable snail (first intermediate host), the eggs hatch and release miracidia which penetrate the snail’s intestine. Snails of the genus Semisulcospira are the most frequent intermediate host for Metagonimus yokogawai. The miracidia undergo several developmental stages in the snail, i.e. sporocysts , rediae , and cercariae . Many cercariae are produced from each redia. The cercariae are released from the snail and encyst as metacercariae in the tissues of a suitable fresh/brackish water fish (second intermediate host) . The definitive host becomes infected by ingesting undercooked or salted fish containing metacercariae . After ingestion, the metacercariae excyst, attach to the mucosa of the small intestine and mature into adults (measuring 1.0 mm to 2.5 mm by 0.4 mm to 0.75 mm) . In addition to humans, fish-eating mammals (e.g., cats and dogs) and birds can also be infected by M. yokogawai.
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Ten utwór znajduje się w domenie publicznej w Stanach Zjednoczonych, ponieważ jest utworem Rządu Federalnego Stanów Zjednoczonych w rozumieniu Tytułu 17, Rozdziału 1, Sekcji 105 Kodeksu Stanów Zjednoczonych. Zobacz także artykuł prawo autorskie.Uwaga: Przepis niniejszy stosuje się wyłącznie do utworów Rządu Federalnego. Nie ma natomiast zastosowania do utworów jakiegokolwiek pojedynczego stanu lub terytorium (state, commonwealth, territory), utworów hrabstw (county), utworów miast i gmin (municipality) czy utworów jakiejkolwiek innej jednostki terytorialnej.
Adults release fully embryonated eggs each with a fully-developed miracidium, and eggs are passed in the host’s feces . After ingestion by a suitable snail (first intermediate host), the eggs hatch and release miracidia which penetrate the snail’s in