Intestinal Flukes

Chai, Jong-Yil

doi:10.1007/978-0-387-71358-8_2

Cited by 55 publications

(23 citation statements)

References 192 publications

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“…or Tympanotonus sp. Many species of freshwater fishes may act as the second intermediate host (Salgado-Maldonado et al 1995, Scholz and Salgado-Maldonado 2000, Chai and Lee 2002, Mitchell et al 2002, Mitchell et al 2005a, Chai 2007. These heterophyid flukes have been introduced into many countries, e.g.…”

Section: Introductionmentioning

confidence: 99%

Import of exotic and zoonotic trematodes (Heterophyidae: Centrocestus sp.) in Xiphophorus maculatus: Implications for ornamental fish import control in Europe

Mehrdana

Jensen

Kania

et al. 2014

Acta Parasitologica

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Ornamental fish, Xiphophorus maculatus, were imported from Singapore to Denmark for distribution to local aquarists. Importers observed lethargic and erratic swimming patterns among fish and forwarded a total of 30 fish for pathological examination to a university diagnostic service. All fish were diagnosed infected with encysted Centrocestus sp. metacercariae in gills (prevalence of 100% and mean intensity of 454.5 ± 161.9 parasites per fish). Metacercariae were identified by morphological and molecular methods. Cysts (mean length 163.3 ± 13.7 µm and mean width 113.3 ± 10.6 µm) contained a bent metacercaria with an X-shaped excretory bladder. PCR amplification of a rDNA region (5.8S rRNA gene, ITS-2, 28S rRNA gene) and subsequent sequencing confirmed the diagnosis. Metacercariae were found in gill filaments adjacent to the cartilage associated with cartilage hypertrophy, epithelial and mucous cell hyperplasia, clubbing and lamellar fusion. Host cell encapsulation of cysts comprised several layers of leucocytes, chondroblast-like and fibroblast-like cells. The observations raise concerns with regard to veterinary inspection and quarantine procedures. The zoonotic potential of these trematodes and a possible spread of the parasites in natural habitats in Europe should be regarded as a public health issue. So far, several cases of human infections have been reported only in Asia, but the potential intermediate host snail, Melanoides tuberculata, has been recorded in Germany. Accordingly, establishment of the parasite in Europe with climate changes should be considered a risk.

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Section: Introductionmentioning

confidence: 99%

Import of exotic and zoonotic trematodes (Heterophyidae: Centrocestus sp.) in Xiphophorus maculatus: Implications for ornamental fish import control in Europe

Mehrdana

Jensen

Kania

et al. 2014

Acta Parasitologica

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“…Human FBT infections are caused by habitual consumption of raw fish containing infective larvae (metacercariae) [1-3]. Studies on FBT metacercarial infections have revealed that some species of freshwater and brackish water fish play important roles as the source of human infections in endemic areas [4-7].…”

Section: Introductionmentioning

confidence: 99%

Foodborne Trematode Metacercariae in Fish from Northern Vietnam and Their Adults Recovered from Experimental Hamsters

Chai

Sohn

2012

Korean J Parasitol

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The prevalence of foodborne trematode (FBT) metacercariae was investigated in fish from 2 localities of northern Vietnam in 2004-2005. Freshwater fish (9 species) were collected from local markets in Hanoi City (n=76) and Nam Dinh Province (n=79), and were examined for FBT metacercariae using the artificial digestion technique. Adult flukes were obtained from hamsters experimentally infected with the metacercariae at day 8 post-infection. Three (Haplorchis pumilio, Centrocestus formosanus, and Procerovum varium) and 6 (Haplorchis taichui, H. pumilio, C. formosanus, P. varium, Stellantchasmus falcatus, and Heterophyopsis continua) species of FBT metacercariae were detected in the 2 regions, respectively. Overall, among the positive fish species, H. pumilio metacercariae were detected in 104 (80.0%) of 130 fish examined (metacercarial density per infected fish; 64.2). C. formosanus metacercariae were found in 37 (40.2%) of 92 fish (metacercarial density; 14.7). P. varium metacercariae were detected in 19 (63.3%) of 30 fish (Anabas testudineus and Mugil cephalus) (metacercarial density; 247.7). S. falcatus metacercariae were found in all 10 M. cephalus examined (metacercarial density; 84.4). H. continua metacercariae (2 in number) were detected in 1 fish of Coilia lindmani. Morphologic characteristics of the FBT metacercariae and their experimentally obtained adults were described. The results have demonstrated that various FBT species are prevalent in northen parts of Vietnam.

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“…With regard to heterophyids, 10 species in 7 genera, i.e. [1,2]. Among these fish hosts, yellowfin goby, Acanthogobius flavimanus, are sometimes heavily infected with the metacercariae of heterophyid flukes, and are popularly eaten raw by many residents in coastal areas of .…”

mentioning

confidence: 99%

“…Heterophyid (Heterophyidae) and echinostomatid flukes (Echinostomatidae) are regarded as the most important groups found in the intestinal tract of humans [1,2]. With regard to heterophyids, 10 species in 7 genera, i.e.…”

mentioning

confidence: 99%

Echinostoma hortense and Heterophyid Metacercariae Encysted in Yellowfin Goby, Acanthogobius flavimanus, from Shinan-gun and Muan-gun (Jeollanam-do), Korea

Sohn

Cho

2009

Korean J Parasitol

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More than 50 million people are currently estimated to be infected with intestinal trematodes, including at least 18 million people infected by fishborne trematodes (FBT) around the world. Heterophyid (Heterophyidae) and echinostomatid flukes (Echinostomatidae) are regarded as the most important groups found in the intestinal tract of humans [1,2]. With regard to heterophyids, 10 species in 7 genera, i.e. [1,2]. Among these fish hosts, yellowfin goby, Acanthogobius flavimanus, are sometimes heavily infected with the metacercariae of heterophyid flukes, and are popularly eaten raw by many residents in coastal areas of . However, echinostomatid metacercariae have never been reported from yellowfin gobies in the Republic of Korea.Therefore, we performed an epidemiological survey to know the infection status of FBT metacercariae in yellowfin gobies collected in Shinan-gun and Muan-gun, Jeollanam-do (province), the Republic of Korea.On September 2006, 14-15 gobies were collected, and examined by artificial digestion method (Table 1). Trematode metacercariae were segregated, collected under a stereomicroscope, and categorized according to measurements and morphological characteristics. Infection rates and intensities were then calculated. A total of 8 Echinostoma hortense metacercariae collected in gobies from Jido-myeon in Shinan-gun were used to experimentally infect a rat to obtain adult worms. Two weeks after the infection, 4 adult flukes were recovered from the small intestine of the rat, which were fixed in 10% neutral buffered formalin, and stained with Semichon's acetocarmine in order to observe their morphological characteristics.Metacercariae of H. nocens, H. continua, and Stictodora spp. were detected in all of 15 gobies caught from Aphae-myeon in Shinangun. The average numbers of metacercariae per infected fish were 153 (H. nocens), 20 (H. continua), and 334 (Stictodora spp.) respectively. A total of 11 P. summa metacercariae were collected in only 1 goby from Aphae-myeon (Table 2). In 2 of 14 gobies Echinostoma hortense and Heterophyid Metacercariae Encysted in Yellowfin Goby, Acanthogobius flavimanus, from Shinan-gun and Muan-gun (Jeollanam-do), Korea Korean J Parasitol. Vol. 47, No. 3: 307-310, September 2009 DOI: 10.3347/kjp.2009

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Intestinal Flukes

Cited by 55 publications

References 192 publications

Import of exotic and zoonotic trematodes (Heterophyidae: Centrocestus sp.) in Xiphophorus maculatus: Implications for ornamental fish import control in Europe

Import of exotic and zoonotic trematodes (Heterophyidae: Centrocestus sp.) in Xiphophorus maculatus: Implications for ornamental fish import control in Europe

Foodborne Trematode Metacercariae in Fish from Northern Vietnam and Their Adults Recovered from Experimental Hamsters

Echinostoma hortense and Heterophyid Metacercariae Encysted in Yellowfin Goby, Acanthogobius flavimanus, from Shinan-gun and Muan-gun (Jeollanam-do), Korea

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