Metagonimus yokogawai

This species occurs in Korea, China, Taiwan, Japan, Russia, Indonesia, Israel, and Spain.

Embryonated eggs are passed into an aquatic environment (fresh or brackish water) each containing a fully developed larva, called a miracidium.

Development can’t proceed past this stage unless the eggs are ingested by the first intermediary host, freshwater snails.

The cercariae then penetrate the skin or go under the scale of a fresh or brackish water fish and encyst as metacercariae in the tissue.

The metacercariae then excyst in the small intestine of the host (human, mammal or bird), and develop into adults.

Adult Metagonimus yokogawai .
Different species of trematodes
Life cycle of Metagonimus yokogawai .