関: Echinostomatidae

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/11 17:09:30」(JST)

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Echinostoma is a genus of trematode parasites, which can infect both humans and other animals. These intestinal flukes have a three-host life cycle with snails or aquatic organisms as intermediate hosts, and a variety of animals, including humans, as their definitive hosts.

Echinostoma infect the gastrointestinal tract of humans, and can cause a disease known as echinostomiasis. The parasites are spread when humans or animals eat infected raw or undercooked food, such as bivalve molluscs or fish ^[1]

Taxonomy

It has been estimated that there are between 61 and 114 species of Echinostoma.^[3] Echinostoma are difficult to classify and are known as a cryptic species (different lineages are considered to be the same species, due to high morphological similarity between them).^[4] Many species of Echinostoma have been re-classified several times. For example, the species now known as Echinostoma caproni, was previously known by a variety of names including E. liei, E. parasensei and E. togoensis.^[3]

Methods for classifying Echinostoma species, such as the Echinostoma revolutum group, were devised by Kanev.^[5] The Echinostoma species in this group are now classified according to their shared morphological and biological characteristics, such as the presence of 37 collar spines.^[5]

Molecular methods, such as sequencing mitochondrial DNA and ribosomal DNA, are also used to distinguish between species of Echinostoma as an alternative to morphological classification methods.^[6]

Morphology

Echinostoma are internal digenean trematode parasites which infect the intestines and bile duct^[3] of their hosts.

The length and width of adult Echinostoma varies between species, but they tend to be approximately 2-10mm × 1-2mm in size.^[7]

Adult Echinostoma have two suckers: an anterior oral sucker and a ventral sucker.^[3] They also have a characteristic head collar with spines surrounding their oral sucker.^[8] The number of collar spines varies between Echinostoma species, but there are usually between 27 and 51.^[3] These spines can be arranged in one or two circles around the sucker, and their arrangement may be a characteristic feature of an Echinostoma species.^[3]

Echinostoma have a digestive system consisting of a pharynx, oesophagus and an excretory pore.^[3]

Echinostoma are hermaphrodites,^[8] and have both male and female reproductive organs. The testes are found in the posterior part of the fluke’s body, in the area furthest from the mouth.^[3] The ovary is also found in this location, close to the testes.^[3]

The eggs (ova) of Echinostoma are operculate ^[3] and vary in size, but are typically in the range of 80-135μm × 55-80μm.^[9]

Geographic distribution

The genus Echinostoma has a global distribution. These parasites are particularly common in South East Asia, in countries such as South Korea and the Philippines.^[10] However, they are also found in some European countries,^[5] and species such as Echinostoma trivolvis are found in North America.^[11]

Life cycle

Echinostoma have three hosts in their life cycle: a first intermediate host, a second intermediate host and a definitive host. Snail species such as Lymnaea spp. are common intermediate hosts for Echinostoma,^[3] although fish and other bivalve molluscs can be also be intermediate hosts for these parasites.^[12]

Echinostoma species have low specificity for their definitive hosts, and can infect a variety of different species of animal, including amphibians,^[13] aquatic birds, mammals and humans.^[12] A definitive host which is infected with Echinostoma will shed unembryonated Echinostoma eggs in their faeces. When the eggs are in contact with fresh water they may become embryonated, and will then hatch and release miracidia.^[1] The miracidia stage of Echinostoma is free-swimming, and actively penetrates the first intermediate snail host, which then becomes infected.^[1]

Life cycle of Echinostoma.

In the first intermediate host, the miracidium undergoes asexual reproduction^[14] for several weeks, which includes sporocyst formation, a few generations of rediae and the production of cercariae.^[1] The cercariae are released from the snail host into water and are also free-swimming. The cercariae penetrate a second intermediate host, or they remain in the first intermediate host, where they form metacercariae.^[12] Definitive hosts become infected by eating secondary hosts which are infected with metacercariae.^[12] Once the metacercariae have been eaten, they excyst in the intestine of the definitive host^[12] where the parasite then develops into an adult.

Echinostoma are hermaphrodites. A single adult individual has both male and female reproductive organs, and is capable of self-fertilization.^[14] Sexual reproduction of adult Echinostoma in the definitive host leads to the production of unembryonated eggs.^[1] The life cycle of Echinostoma is temperature dependent, and occurs quicker at higher temperatures.^[3] Echinostoma eggs can survive for about 5 months and still have the ability to hatch and develop into the next life cycle stage.^[15]

Echinostomiasis

Infection of humans with members of the family Echinostomatidae, including Echinostoma, can lead to a disease called echinostomiasis. E. revolutum, E. echinatum, E. malaynum and E. hortense are particularly common causes of Echinostoma infections in humans.^[3] Humans can become infected with Echinostoma by eating infected raw or undercooked food, particularly fish, clams and snails.^[1] Infection with these parasites tends to be common in regions where cultural dishes require the use of raw or undercooked food that may be infected with Echinostoma.^[16] A mild infection may not have any symptoms.^[17] If symptoms are present they can include abdominal pain, diarrhoea, tiredness and weight loss.^[1]

Epidemiology of echinostomiasis

Echinostomiasis is endemic in South East Asia and the Far East, in countries including China, Korea, Taiwan, Philippines, Malaysia, Indonesia and India.^[18] Echinostomiasis has also been reported in Japan, Singapore, Romania, Hungary and Italy.^[18] The prevalence of echinostomiasis varies between countries^[18] but there tend to be foci of infection in areas where raw or undercooked hosts of Echinostoma, such as snails or fish, are widely consumed.^[17]

Pathogenesis

Echinostoma are not highly pathogenic.^[17] Symptoms of greater severity tend to be seen in an echinostomiasis infection where there is a higher number of flukes.^[17] The flukes cause damage to the intestinal mucosa, which leads to ulceration and inflammation.^[17]

Diagnosis

Unstained Echinostoma egg.

An Echinostoma infection can be diagnosed by observing the parasite eggs in the faeces of an infected individual, under a microscope. Methods such as the Kato-Katz procedure can be used to do this.^[1] The eggs typically have a yellow-brown appearance, and are ellipsoid in shape.^[17] To confirm which species is causing the infection adult worms must be recovered from the infected individual, such as with anthelmintic treatment.^[17]

Treatment and prevention

Echinostomiasis can be treated with the anthelmintic drug praziquantel, as for other intestinal trematode infections.^[1] Side effects of anthelmintic drug treatment may include nausea, abdominal pain, headaches or dizziness.^[1]^[19]

Echinostomiasis can be controlled at the same time as other food-borne parasite infections, using existing control programmes.^[18] Interrupting the parasite’s lifecycle by efficient diagnosis and subsequent treatment of infected individuals, and preventing reinfection, may help to control this disease.^[20] As echinostomiasis is acquired through the consumption of raw or undercooked infected food, cooking food thoroughly will prevent infection.

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Toledo R, Esteban JG & Fried B (1995). "Current status of food-borne trematode infections". European Journal of Clinical Microbiology and Infectious Diseases 31: 1705–1718. doi:10.1007/s10096-011-1515-4.
^ Rudolphi K. (1809). Entoz. Hist. Nat. 2(1): 38.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Huffman, Jane E; Fried, Bernard (1990). "Echinostoma and Echinostomiasis". In Baker, John R; Muller, Ralph. Advances in Parasitology. Academic Press Limited. pp. 215–269. ISBN 0-12-031729-X.
^ Detwiler JT, Bos DH & Minchella DJ (2010). "Revealing the secret lives of cryptic species: Examining the phylogenetic relationships of echinostome parasites in North America". Molecular Phylogenetics and Evolution 55: 611–620. doi:10.1016/j.ympev.2010.01.004.
^ ^a ^b ^c Kanev I (1994). "Life-cycle, delimitation and redescription of Echinostoma revolutum (Froelich, 1802) (Trematoda: Echinostomatidae)". Systematic Parasitology 28: 125–144. doi:10.1007/BF00009591.
^ Morgan JAT & Blair D (1998). "Relative merits of nuclear ribosomal internal transcribed spacers and mitochondrial CO1 and ND1 genes for distinguishing among Echinostoma species (Trematoda)". Parasitology 116: 289–297. doi:10.1017/s0031182097002217.
^ Centers for Disease Control and Prevention. "Echinostomiasis". Archived from the original on 18 March 2014.
^ ^a ^b Gonçalves JP, Oliveira-Menezes A, Maldonado Junior A et al (2013). "Evaluation of Praziquantel effects on Echinostoma paraensei ultrastructure". Veterinary Parasitology 194: 16–25. doi:10.1016/j.vetpar.2012.12.042.
^ Centers for Disease Control and Prevention (29 November 2013). "Echinostomiasis". Archived from the original on 18 March 2014.
^ Fürst T, Keiser J & Utzinger A (2012). "Global burden of human food-borne trematodiasis: a systematic review and meta-analysis". The Lancet Infectious Diseases 12: 210–221. doi:10.1016/S1473-3099(11)70294-8.
^ Kanev I, Fried B, Dimitrov V & Radev V (1995). "Redescription of Echinostoma trivolvis (Cort, 1914) (Trematoda: Echinostomatidae) with a discussion on its identity". Systematic Parasitology 32: 61–70. doi:10.1007/BF00009468.
^ ^a ^b ^c ^d ^e Centers for Disease Control and Prevention (29 November 2013). "Echinostomiasis". Archived from the original on 18 March 2014.
^ Belden LK (2006). "Impact of eutrophication on wood frog, Rana sylvatica, tadpoles infected with Echinostoma trivolvis cercariae". Canadian Journal of Zoology 84: 1315–1321. doi:10.1139/z06-119.
^ ^a ^b Trouvé S, Renaud F, Durand P & Jourdane J (1999). "Reproductive and mate choice strategies in the hermaphroditic flatworm Echinostoma caproni". Journal of Heredity 90: 582–585. doi:10.1093/jhered/90.5.582.
^ Christensen NØ, Frandsen F & Roushdy MZ (1980). "The influence of environmental conditions and parasite-intermediate host-related factors on the transmission of Echinostoma liei". Zeitschrift für Parasitenkunde 63: 47–63.
^ Keiser J & Utzinger J (2005). "Emerging foodborne trematodiasis". Emerging Infectious Diseases 11: 1507–1514. doi:10.3201/eid1110.050614.
^ ^a ^b ^c ^d ^e ^f ^g Carney WP (1991). "Echinostomiasis - a snail-borne intestinal trematode zoonosis". Southeast Asian Journal of Tropical Medicine and Public Health 22: Suppl:206–211.
^ ^a ^b ^c ^d Fried B, Graczyk TK & Tamang L (2004). "Food-borne intestinal trematodiases in humans". Parasitology Research 93: 159–170. doi:10.1007/s00436-004-1112-x.
^ Keiser J & Utzinger J (2004). "Chemotherapy for major food-borne trematodes: a review". Expert Opinion on Pharmacotherapy 5: 1711–1726. doi:10.1517/14656566.5.8.1711.
^ Graczyk TK & Fried B (1998). "Echinostomiasis: a common but forgotten food-borne disease". The American Journal of Tropical Medicine and Hygiene 58: 501–504.

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1. 腸管寄生虫症 intestinal flukes

English Journal

Epidemiology and molecular genotyping of echinostome metacercariae in Filopaludina snails in Lamphun Province, Thailand.

Noikong W1, Wongsawad C2.Author information 1Applied Parasitology Research Laboratory Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai Province, Thailand; Applied Biology Program, Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phisanulok Province, Thailand.2Applied Parasitology Research Laboratory Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai Province, Thailand; Applied Technology in Biodiversity Research Unit, Institute of Science and Technology, Chiang Mai University, Chiang Mai Province, Thailand. Electronic address: cwongsawad@gmail.com.AbstractOBJECTIVE: To analyze the prevalence of echinostome metacercariae inFilopaludina dorliaris (F. dorliaris) and Filopaludina martensi martensi (F. martensi martensi) and genotype variation of echinostome metacercariae by using random amplified polymorphic DNA (RAPD) analysis.
Asian Pacific journal of tropical medicine.Asian Pac J Trop Med.2014 Jan;7(1):26-9. doi: 10.1016/S1995-7645(13)60186-8.
OBJECTIVE: To analyze the prevalence of echinostome metacercariae inFilopaludina dorliaris (F. dorliaris) and Filopaludina martensi martensi (F. martensi martensi) and genotype variation of echinostome metacercariae by using random amplified polymorphic DNA (RAPD) analysis.METHODS: Filopaludina sp.
PMID 24418078

Effects of Echinostoma caproni miracidia dose on the neutral and polar lipids of Biomphalaria glabrata as determined by high-performance thin-layer chromatography.

Hunsberger A, Fried B, Sherma J.Author information Department of Chemistry, Lafayette College, Easton, PA, USA.AbstractThe effects of a 5 versus 25 miracidia exposure of Echinostoma caproni on the lipid composition of Biomphalaria glabrata was studied using high performance thin layer chromatography (HPTLC)-densitometry. A 50 miracidia dose was not used because such a high level of exposure caused severe snail mortality by 3 weeks post-exposure (PE). Lipids were determined in the digestive-gland gonad complex (DGG) of the exposed snails and in the uninfected matched controls at 2 and 4 weeks PE. Extraction of lipids from DGGs was carried out by the Folch method with chloroform-methanol (2:1), and extracts were analyzed on Analtech HPTLC-HLF pre-adsorbent silica gel plates with measurement of separated bands using a CAMAG Scanner 3. For neutral lipids the mobile phase was petroleum ether-diethyl ether-glacial acetic acid (80:20:1) and the detection reagent was 5% ethanolic phosphoric acid, and for polar lipids chloroform-methanol-deionized water (65:25:4) mobile phase and 10% cupric sulfate in 8% phosphoric acid detection reagent were used. No significant differences in the concentrations of free sterols, free fatty acids, triacylglycerols, phosphatidylcholine, and phosphatidylethanolamine were seen at 2 weeks PE in any of the groups. At 4 weeks PE, the free fatty acid concentration increased significantly in the snails exposed to 25 miracidia compared to that of the 5 miracidia/snail group or the controls. Elevation of the free fatty acid fraction in the high dose snail group suggested that some changes occurred in the lipid metabolism of the snails in that group as a function of miracidia dose.
Acta parasitologica / Witold Stefański Institute of Parasitology, Warszawa, Poland.Acta Parasitol.2013 Dec;58(4):615-8. doi: 10.2478/s11686-013-0180-4. Epub 2013 Dec 13.
The effects of a 5 versus 25 miracidia exposure of Echinostoma caproni on the lipid composition of Biomphalaria glabrata was studied using high performance thin layer chromatography (HPTLC)-densitometry. A 50 miracidia dose was not used because such a high level of exposure caused severe snail morta
PMID 24338329

In vitro excystation of Echinostoma paraensei (Digenea: Echinostomatidae) metacercariae assessed by light microscopy, morphometry and confocal laser scanning microscopy.

Souza J, Garcia J, Neves RH, Machado-Silva JR, Maldonado A.Author information Romero Lascasas Porto Laboratory of Helminthology, Department of Microbiology, Immunology and Parasitology, School of Medical Science, Biomedical Center, Av. Prof. Manoel de Abreu 444/5 andar, Vila Isabel, 20511-070 Rio de Janeiro, Brazil.AbstractTrypsin and bile salts have been identified as important triggers for excystation of Echinostoma metacercariae. Although excystation in trematodes is a well-known phenomenon, some morphological developmental changes remain to be elucidated. In order to gain further insight into the in vitro development of metacercariae, we assayed different cultivating conditions: 0.5% trypsin and 0.5% bile salts; 1% trypsin and 1% bile salts; 1% trypsin and 0.5% bile salts; 0.5% bile salts; or 0.5% trypsin. By means of light microscopy and confocal microscopy, we characterized each encysted, activated, breached and excysted stage based on the morphological features. However, breached and excysted stages were not revealed in both bile salts and trypsin-free medium. Excretory concretions (25 ± 3.9) were visualized within excretory tubules, close to the ventral sucker and genital anlage. The oral sucker armed with spines and digestive system was similar to those of adult worms. The reproductive system is composed of a genital anlage and the cirrus sac primordium. In short, trypsin and bile salts associated were fundamental for the in vitro metacercariae excystation of Echinostoma paraensei. This article presents the first detailed information of all stages of metacercariae excystation obtained through light and confocal microscopy.
Experimental parasitology.Exp Parasitol.2013 Dec;135(4):701-7. doi: 10.1016/j.exppara.2013.10.009. Epub 2013 Oct 31.
Trypsin and bile salts have been identified as important triggers for excystation of Echinostoma metacercariae. Although excystation in trematodes is a well-known phenomenon, some morphological developmental changes remain to be elucidated. In order to gain further insight into the in vitro developm
PMID 24184079

Japanese Journal

タンチョウの寄生蠕虫類調査

日本野生動物医学会誌 19(1), 31-35, 2014
NAID 130004559274

Echinostoma hortense Infection with Enteritis Diagnosed by Upper Gastrointestinal Endoscopy in a Dog

The journal of veterinary medical science 75(7), 991-994, 2013-07
NAID 40019775444

Echinostoma hortense Infection with Enteritis Diagnosed by Upper Gastrointestinal Endoscopy in a Dog

Journal of Veterinary Medical Science 75(7), 991-994, 2013
NAID 130003362148

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★リンクテーブル★

リンク元	「棘口吸虫属」「棘口吸虫」「エキノストーマ属」
拡張検索	「Echinostoma属」「Echinostomatidae」

「棘口吸虫属」

Echinostoma
	Two specimens of Echinostoma revolutum
Scientific classification
Kingdom:	Animalia
Phylum:	Platyhelminthes
Class:	Trematoda
Order:	Echinostomida
Suborder:	Echinostomata
Family:	Echinostomatidae
Genus:	Echinostoma; Rudolphi, 1809

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ラ: Echinostoma
関: 棘口吸虫類、棘口吸虫、エキノストーマ属、Echinostoma属

「棘口吸虫」

　　[★]

ラ: Echinostoma
関: 棘口吸虫属、エキノストーマ属、Echinostoma属

「エキノストーマ属」

　　[★]

ラ: Echinostoma
関: 棘口吸虫属、棘口吸虫、Echinostoma属

「Echinostoma属」

　　[★]

ラ: Echinostoma
関: 棘口吸虫属、棘口吸虫、エキノストーマ属

「Echinostomatidae」

　　[★]

棘口吸虫科

棘口吸虫科、棘口吸虫類

関: Echinostoma

[Toledo2012-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Toledo R, Esteban JG & Fried B (1995). "Current status of food-borne trematode infections". European Journal of Clinical Microbiology and Infectious Diseases 31: 1705–1718. doi:10.1007/s10096-011-1515-4.

[2] Rudolphi K. (1809). Entoz. Hist. Nat. 2(1): 38.

[AinP-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Huffman, Jane E; Fried, Bernard (1990). "Echinostoma and Echinostomiasis". In Baker, John R; Muller, Ralph. Advances in Parasitology. Academic Press Limited. pp. 215–269. ISBN 0-12-031729-X.

[Detwiler2010-4] Detwiler JT, Bos DH & Minchella DJ (2010). "Revealing the secret lives of cryptic species: Examining the phylogenetic relationships of echinostome parasites in North America". Molecular Phylogenetics and Evolution 55: 611–620. doi:10.1016/j.ympev.2010.01.004.

[Kanev1994-5] Kanev I (1994). "Life-cycle, delimitation and redescription of Echinostoma revolutum (Froelich, 1802) (Trematoda: Echinostomatidae)". Systematic Parasitology 28: 125–144. doi:10.1007/BF00009591.

[6] Morgan JAT & Blair D (1998). "Relative merits of nuclear ribosomal internal transcribed spacers and mitochondrial CO1 and ND1 genes for distinguishing among Echinostoma species (Trematoda)". Parasitology 116: 289–297. doi:10.1017/s0031182097002217.

[CDC1-7] Centers for Disease Control and Prevention. "Echinostomiasis". Archived from the original on 18 March 2014.

[Gon.C3.A7alves2013-8] Gonçalves JP, Oliveira-Menezes A, Maldonado Junior A et al (2013). "Evaluation of Praziquantel effects on Echinostoma paraensei ultrastructure". Veterinary Parasitology 194: 16–25. doi:10.1016/j.vetpar.2012.12.042.

[9] Centers for Disease Control and Prevention (29 November 2013). "Echinostomiasis". Archived from the original on 18 March 2014.

[Furst2012-10] Fürst T, Keiser J & Utzinger A (2012). "Global burden of human food-borne trematodiasis: a systematic review and meta-analysis". The Lancet Infectious Diseases 12: 210–221. doi:10.1016/S1473-3099(11)70294-8.

[Kanev1995-11] Kanev I, Fried B, Dimitrov V & Radev V (1995). "Redescription of Echinostoma trivolvis (Cort, 1914) (Trematoda: Echinostomatidae) with a discussion on its identity". Systematic Parasitology 32: 61–70. doi:10.1007/BF00009468.

[CDC_Index-12] Centers for Disease Control and Prevention (29 November 2013). "Echinostomiasis". Archived from the original on 18 March 2014.

[Belden2006-13] Belden LK (2006). "Impact of eutrophication on wood frog, Rana sylvatica, tadpoles infected with Echinostoma trivolvis cercariae". Canadian Journal of Zoology 84: 1315–1321. doi:10.1139/z06-119.

[Trouve1999-14] Trouvé S, Renaud F, Durand P & Jourdane J (1999). "Reproductive and mate choice strategies in the hermaphroditic flatworm Echinostoma caproni". Journal of Heredity 90: 582–585. doi:10.1093/jhered/90.5.582.

[Christensen1980-15] Christensen NØ, Frandsen F & Roushdy MZ (1980). "The influence of environmental conditions and parasite-intermediate host-related factors on the transmission of Echinostoma liei". Zeitschrift für Parasitenkunde 63: 47–63.

[Keiser2005-16] Keiser J & Utzinger J (2005). "Emerging foodborne trematodiasis". Emerging Infectious Diseases 11: 1507–1514. doi:10.3201/eid1110.050614.

[Carney1991-17] ^ ^a ^b ^c ^d ^e ^f ^g Carney WP (1991). "Echinostomiasis - a snail-borne intestinal trematode zoonosis". Southeast Asian Journal of Tropical Medicine and Public Health 22: Suppl:206–211.

[Fried2004-18] Fried B, Graczyk TK & Tamang L (2004). "Food-borne intestinal trematodiases in humans". Parasitology Research 93: 159–170. doi:10.1007/s00436-004-1112-x.

[KJUJ2004-19] Keiser J & Utzinger J (2004). "Chemotherapy for major food-borne trematodes: a review". Expert Opinion on Pharmacotherapy 5: 1711–1726. doi:10.1517/14656566.5.8.1711.

[Graczyk1998-20] Graczyk TK & Fried B (1998). "Echinostomiasis: a common but forgotten food-borne disease". The American Journal of Tropical Medicine and Hygiene 58: 501–504.

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Echinostoma