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Metagonimus yokogawai is a species of a trematode, or fluke worm, in the family Heterophyidae.

It is a human parasite causing metagonimiasis.

Distribution

This species occurs in Korea, China, Taiwan, Japan, Russia, Indonesia, Israel, and Spain.^[3]

Description

Adult Metagonimus yokogawai.

Life cycle

Life cycle of Metagonimus yokogawai.

The first intermediate hosts of Metagonimus yokogawai include freshwater snails Semisulcospira libertina, Semisulcospira coreana,^[3] and Semisulcospira reiniana.^[2]

The second intermediate host include freshwater fish: Plecoglossus altivelis, Tribolodon hakonensis, Tribolodon ezoe, and Lateolabrax japonicus.^[2]^[3]

Natural definitive hosts are: dogs, cats, rats, and humans.^[3] Experminetal type hosts are: Syrian golden hamster.^[2]

Here, the life cycle of Metagonimus yokogawai will be examined, however, it should be noted Metagonimus takahashii and Metagonimus miyatai follow similar life cycle pattern. All three species are hermaphroditic and capable of self-fertilization. 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. After the snail host ingests the eggs, miracidia emerge and penetrate the snail’s intestines. In the snail tissue, mircadia develop into sporocysts, then rediae, and finally emerge from the snail as cercariae. 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 type of fish that serves as secondary host varies based on location. The host then becomes infected by consuming undercooked, raw, or pickled fish containing the infectious metacercariae. The metacercariae then excyst in the small intestine of the host (human, mammal or bird), and develop into adults. In the small intestine, the adults attach to the walls and develop new eggs.

References

^ (Japanese) Katsurada F. (1912). "Heterophyes in Japan. II. Creation of a new genus Metagonimus". Okayama Igakkai Zasshi 273: 768–778.
^ ^a ^b ^c ^d Shimazu T. & Kino H. (2015). "Metagonimus yokogawai (Trematoda: Heterophyidae): From Discovery to Designation of a Neotype". The Korean Journal of Parasitology 53(5): 627-639. doi:10.3347/kjp.2015.53.5.627.
^ ^a ^b ^c ^d Chai J. Y., Darwin Murrell K. & Lymbery A. J. (2005). "Fish-borne parasitic zoonoses: Status and issues". International Journal for Parasitology 35(11-12): 1233-1254. doi:10.1016/j.ijpara.2005.07.013.

External links

"Metagonimus yokogawai". National Center for Biotechnology Information (NCBI).

UpToDate Contents

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1. 腸管寄生虫症 intestinal flukes

English Journal

Heterophyid trematodes recovered from people residing along the Boseong River, South Korea.

Chai JY1, Jung BK2, Kim DG3, Kim JL4, Lim H5, Shin EH6, Lee KH7, Kim MR8, Han SJ9, Yeom JH10, Park SM11, Hwang JS12.
Acta tropica.Acta Trop.2015 May 2;148:142-146. doi: 10.1016/j.actatropica.2015.04.025. [Epub ahead of print]
We conducted an epidemiological survey to determine the status of heterophyid fluke infections among people residing along the Boseong River, Gokseong-gun, South Korea (= Korea) from October 2011 to February 2012. Fecal specimens were collected from 115 (male 51, female 64) people and examined for i
PMID 25944352

Redescription of Aphalloides coelomicola Dollfus, Chabaud & Golvan, 1957 (Digenea, Opisthorchioidea) based on specimens from Knipowitschia caucasica (Berg) (Actinopterygii, Gobionellidae) from a Black Sea lagoon, with comments on the systematic position of the genus.

Stoyanov B1, Neov B, Pankov P, Radoslavov G, Hristov P, Georgiev BB.
Systematic parasitology.Syst Parasitol.2015 May;91(1):1-12. doi: 10.1007/s11230-015-9559-y. Epub 2015 Apr 11.
The genus Aphalloides Dollfus, Chabaud & Golvan, 1957 consists of two species parasitic in the body cavity of sand gobies. Its systematic position in the superfamily Opisthorchioidea Looss, 1899 is unresolved and it has been placed by various authors in three families, i.e. Cryptogonimidae Ward,
PMID 25862029

Japanese Journal

Geographical distribution of Metagonimus yokogawai and M. miyatai in Shizuoka Prefecture, Japan, and their site preferences in the sweetfish, Plecoglossus altivelis, and hamsters

KINO Hideto,SUZUKI Tohru,OISHI Hisaji,SUZUKI Saeko,YAMAGIWA Shizuko,ISHIGURO Mitsuru
Parasitology international : official journal of the Japanese Society of Parasitology 55(3), 201-206, 2006-09-01
NAID 10018772404

Related Pictures

★リンクテーブル★

リンク元	「横川吸虫」「Heterophyidae」
関連記事	「Metagonimus」

「横川吸虫」

Metagonimus yokogawai
	Metagonimus yokogawai
Scientific classification
Kingdom:	Animalia
Phylum:	Platyhelminthes
Class:	Trematoda
Subclass:	Digenea
Order:	Opisthorchiida
Family:	Heterophyidae
Genus:	Metagonimus
Species:	M. yokogawai
Binomial name
	Metagonimus yokogawai; (Katsurada, 1912)
Synonyms
	Heterophyes yokogawai Katsurada, 1912; Loxotrema yokogawai (Katsurada, 1912); Yokogawa yokogawai (Katsurada, 1912)