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incidence of centrocestus formosanus infection in snails. 19873585643
[sensillae and protonephridia of cercaria of centrocestus formosanus and centrocestus sp. (centrocestinae, heterophyidae)].a description is given of cercarial chaetotaxy of two centrocestinae (heterophyidae, opisthorchioidea) from malaysia: centrocestus formosanus and centrocestus sp.--comparison with cercarial chaetotaxy of taxonomically related groups indicates that 1. the chaetotaxy of the centrocestinae agrees with that of other opisthorchioidea, 2. there is an important difference between chaetotaxy of centrocestinae and other heterophyidae which suggest that the family is heterogeneous.19827168529
[report on the first nationwide survey of the distribution of human parasites in china. 1. regional distribution of parasite species].a nationwide (taiwan province not included) survey of the distribution of human parasites in china during 1988-1992 was conducted under the auspices of the ministry of public health, with stratified masses randomly sampling. a total of 2,848 pilot sites in 726 counties with a population of 1,477,742 were surveyed, according to unified standard, unified diagnostic method and control quality. the overall infection rate of parasites was 62. 632%. among them, the infection rate was over 50% in 17 pr ...19947720194
prevalence of larval helminths in freshwater snails of the kinmen islands.a survey of larval helminths in freshwater snails of kinmen was conducted from 1986 to 1987. parasitological examinations of a total of 726 live snails collected from 25 loci revealed that 20 of 80 bithynia fuchsiana were infected with metacercariae of echinostoma gotoi and 36 with metacercariae of other echinostomes. among 57 radix auricularia swinhoei snails, 27 were infected with echinostomes and eight with metacercariae of other flukes. of 20 cipangopaludina chinensis, 18 were found with lar ...19938132969
pattern of emergence and the effects of temperature and light on the emergence and survival of heterophyid cercariae (centrocestus formosanus and haplorchis pumilio).production of the cercariae of centrocestus formosanus and haplorchis pumilio was not affected by a 10-day starvation of the snail host melanoides tuberculata, and there was no circadian rhythm in the pattern of cercarial emergence. daily average cercarial productions from each snail were 1,643 for c. formosanus and 689 for h. pumilio at 25 c and 500 lux illumination. the number of cercariae was moderately correlated with the size of snail host. the heaviest sheddings ever observed from 1 snail ...19968604114
centrocestus formosanus: surface morphology of metacercaria, adult and eggthe surface morphology of metacercariae isolated from puntius spp., adult worms from infected hamsters and eggs of centrocestus formosanus (digenea: heterophyidae) were studied using scanning electron microscopy. it was found that the surfaces of the metacercariae and adult worms were closely similar in appearance. the oral sucker was surrounded by a circumoral expansion with two rows of 32 spines (16 spines each). the ventral sucker, with six large nonciliated papillae on the lip, and the genit ...19979443954
metacercariae isolated from cyprinoid fishes in khon kaen district by digestion technic.several kinds of fresh-water fishes collected from natural water resources in khon kaen district were digested with 0.25% pepsin a to obtain the infective stage or metacercariae of fish-borne trematodes. most of them harbored at least 3 species of trematodes. two families of medical trematodes, i.e., family heterophyidae and family opisthorchiidae, were isolated. the heterophyid flukes consisted of haplorchis taichui, h. pumilio and centrocestus formosanus. opisthorchis viverrini was the only pa ...19979656383
opisthorchis viverrini metacercaria in thai freshwater fish.examination for metacercaria in freshwater fish, the common intermediate hosts of opisthorchis viverrini was carried out during 1992-1996. the 4-year survey of fish from markets in 14 provinces revealed that metacercariae of o. viverrini were found in fish from udon thani, sa kaeo and prachin buri provinces; fish from aranyaprathet district had the highest positive rates (25-28%). fish from 12 provinces were found to be positive with heterophyid metacercariae, namely: haplorchis pumilio, h. taic ...19989886121
[distribution of medically important freshwater snails and larval trematodes from parafossarulus manchouricus and semisulcospira libertina around the jinyang lake in kyongsang-nam-do, korea]the jinyang lake is dammed up nam river, and surrounded by jinju city and four counties; jinyang, sanchong, hadong, and sachon in kyongsang-nam-do, korea. the area around this man-made lake have been known as an endemic focus of clonorchiasis in korea. the present study was first aimed to know the distribution of freshwater mollusks including medically important snails, and larval trematodes shed from parafossarulus manchouricus and semisulcospira libertina. in addtion to above studies, water an ...198312902649
helminth parasites in freshwater fish from the papaloapan river basin, mexico.a checklist based on previously published records and original data is presented for the helminth parasites reported in 35 fish species from nine families from the rio papaloapan basin, east mexico. the checklist contains 85 taxa from 39 helminth families. trematodes and nematodes were the most abundant taxonomic groups. the helminth fauna in the fish of the papaloapan river basin predominantly consists of neotropical species that are largely autogenic. the introduced species centrocestus formos ...200515812673
prevalence of fishborne zoonotic parasites in important cultured fish species in the mekong delta, vietnam.a seasonal investigation on the occurrence of fishborne zoonotic trematodes (fzt) in economically important mono-cultured hybrid catfish and giant gouramy was conducted in the mekong delta of vietnam. fish from carp poly-culture and intensive small-scale integrated vegetable-aquaculture-animal husbandry farming (vac) systems were also examined. no fzt metacercariae were found in any mono-cultured hybrid catfish. fzt metacercariae were common, however, in fish from the other three systems: all me ...200717618460
centrocestus formosanus (digenea: heterophyidae) encysted in the freshwater fish, puntius brevis, from lao pdr.the metacercariae of centrocestus formosanus, a minute intestinal trematode of mammals and birds, were detected in the freshwater fish, puntius brevis, from vientiane municipality, lao pdr. the metacercariae were experimentally fed to mice, and adult flukes were recovered in their small intestines 7 days later. the adult flukes were morphologically characterized by having 32 (rarely 34) circumoral spines arranged in 2 alternative rows, a large bipartite seminal vesicle, an oval-shaped ovary, and ...200818344679
prevalence of zoonotic trematodes in fish from a vietnamese fish-farming community.the prevalence of fish-borne zoonotic trematode (fzt) metacercariae was investigated in fish farmed by rural households in nghe an province, located in northern vietnam. in total, 716 fish, including tilapia (oreochromis niloticus) and 6 carp species, i.e., grass carp (ctenopharyngodon idellus), bighead carp (aristichthys nobilis), mrigal (cirrhinus mrigala), common carp (cyprinus carpio), silver carp (hypophthalmychthys molitrix), and roha (labeo rohita), collected from 53 fish farms were exami ...200818564743
trematode infections of the freshwater snail family thiaridae in the khek river, thailand.the freshwater snail family thiaridae was studied at five different locations: water sources for the khek river, thailand. snail samples were collected by hand using counts per unit of time sampling method between december 2004 and october 2005. the physico-chemical quality of the water changed with the seasons and affected the sampling areas during both the dry season and the flood season. a total of 9,568 snail samples comprised of 14 species were found. these were 284 tarebia granifera, 24 me ...200718613543
fishborne trematode metacercariae detected in freshwater fish from vientiane municipality and savannakhet province, lao pdr.freshwater fish from vientiane municipality and savannakhet province, lao pdr were examined by the muscle compression and artificial digestion methods to know the infection status with trematode metacercariae. in the fish from savannakhet, 2 species of metacercariae, opisthorchis viverrini and haplorchis taichui, were detected. o. viverrini metacercariae were found in 6 species of fish, puntius brevis, hampala dispar, esomus metallicus, mystacoleucus marginatus, puntioplites falcifer, and cycloc ...200819127332
trematode centrocestus formosanus infection and distribution in ornamental fishes in mexico.the aim of this study was to determine the ornamental fish species affected by the metacercariae of the digenean trematode centrocestus formosanus and its distribution in 48 fish farms in morelos, central mexico. the parasite was found to form various numbers of branchial cysts in 11 of the 25 species analyzed. goldfish carassius auratus was the most commonly affected species; 20 of 30 farms were positive for this parasite, the fish showing severe clinical signs and having a high mortality rate. ...200919485122
fishborne trematode metacercariae in freshwater fish from guangxi zhuang autonomous region, china.a survey was performed to investigate the infection status of fishborne trematode (fbt) metacercariae in freshwater fish from guangxi zhuang autonomous region, china. a total of 307 freshwater fish of 31 species were collected from 5 administrative regions of guangxi zhuang autonomous region. they were examined by artificial digestion method from july 2003 to august 2004. no metacercariae were detected in fish from fusui-xian. in fish from mashan-xian and a market in nanning, 3 species of metace ...200919724698
poultry as reservoir hosts for fishborne zoonotic trematodes in vietnamese fish farms.fishborne zoonotic trematodes (fzt) are widespread in vietnam and southeast asia. it is now recognized that the risk of being infected from eating raw fish dishes applies not only to humans, but also to domestic animals (e.g., cats, dogs, and pigs) and fish-eating birds. the role of ducks and chicken, commonly raised on fish farms, as reservoir hosts, however, has not been adequately investigated. to study this question, chickens and ducks from integrated poultry-fish farms in nghia lac and nghi ...201020149548
farm-level risk factors for fish-borne zoonotic trematode infection in integrated small-scale fish farms in northern vietnam.northern vietnam is an endemic region for fish-borne zoonotic trematodes (fzt), including liver and intestinal flukes. humans acquire the fzt infection by eating raw or inadequately cooked fish. the production of fzt-free fish in aquaculture is a key component in establishing a sustainable program to prevent and control the fzt transmission to humans. interventions in aquaculture should be based on knowledge of the main risk factors associated with fzt transmission.201020644617
[centrocestus formosanus (opisthorchiida: heterophyidae) as a cause of death in gray tilapia fry oreochromis niloticus (perciforme: cichlidae) in the dry pacific of costa rica].centrocestusformosanus is a zoonotic trematode from asia and has been mainly associated as cause of death of cultured fish. to identify pathogen trematode species in tilapia fry (oreochromis niloticus) and to determine mollusks hosting these parasites, freshwater mollusks were collected from tilapia cultured ponds and experimental infections were carried out with tilapia fries and different mollusk species. a total of 907 freshwater mollusks were obtained from tilapia ponds and were identified t ...201021250483
short communicationgill lesions in common carp, cyprinus carpio l., in mexico due to the metacercariae of centrocestus formosanus. 199821361978
melanoides tuberculata (mollusca: thiaridae) as an intermediate host of centrocestus formosanus (trematoda: heterophyidae) in brazil.pleurolophocercous cercariae emerged from naturally infected melanoides tuberculata from minas gerais state, brazil, were used to perform experimental infection of laboratory-reared poecilia reticulata. mature metacercariae were obtained from the gills of fishes and force-fed to mus musculus. the adult parasites which recovered from small intestines of mice were identified as centrocestus formosanus. this is the first report of m. tuberculata as intermediate host of this heterophyid in brazil.201021748229
Rapid and simple identification of human pathogenic heterophyid intestinal fluke metacercariae by PCR-RFLP.Six species of heterophyid intestinal flukes (HIFs) constitute the major endemic zoonotic fish-borne pathogens in Asia: Haplorchis taichui, H. pumilio, H. yokogawai, Procerovum varium, Stellantchasmus falcatus, and Centrocestus formosanus. Several different species of these parasites are often found co-infecting the same second intermediate fish host. Because of their morphological similarities, differentiating between species of HIF metacercariae is difficult, time-consuming, and frequently res ...201121946336
fluctuations in densities of the invasive gill parasite centrocestus formosanus (trematoda: heterophyidae) in the comal river, comal county, texas, u.s.a.abstract centrocestus formosanus (trematoda: heterophyidae) is an invasive fish parasite in the comal river, texas, and is considered a threat to the federally endangered fountain darter, etheostoma fonticola. monitoring densities of c. formosanus cercariae is crucial to determining levels of infection pressure. we sampled 3 sites in the comal river during 2 sampling periods, the first during 2006 - 2007, and again during 2009 - 2010. two of the sites were located in the upstream reach of l ...201121851264
Human infections of fish-borne trematodes in Vietnam: prevalence and molecular specific identification at an endemic commune in Nam Dinh province.The prevalence of fish-borne trematodes in humans and their molecular identification was investigated in the Rang Dong commune of Nam Dinh province, Vietnam, between January 2009 and December 2010. A total of 405 people in this commune were interviewed on the habit of eating raw fish and all of their stool samples were collected using the Kato-Katz technique for examination of the presence of fish-borne trematodes. The worms (and eggs) were first morphologically examined, counted, described and ...201121959023
metacercarial distribution of centrocestus formosanus among fish hosts in the guadalupe river drainage of texas.we examined the gills of wild fish collected from central texas for centrocestus formosanus metacercariae to determine whether this temperature-restricted parasite had invaded the thermally dynamic guadalupe river via an introduced population in its thermally stable tributary, the comal river. we collected fish from three sites in the guadalupe river near its confluence with the comal river (upstream, at, and downstream) and one site in the comal river. centrocestus formosanus infected 14 of the ...201122216710
anthelmintic effect of bacillus thuringiensis strains against the gill fish trematode centrocestus formosanus.parasitic agents, such as helminths, are the most important biotic factors affecting aquaculture, and the fluke centrocestus formosanus is considered to be highly pathogenic in various fish species. there have been efforts to control this parasite with chemical helminthicides, but these efforts have had unsuccessful results. we evaluated the anthelmintic effect of 37 strains of bacillus thuringiensis against c. formosanus metacercariae in vitro using two concentrations of total protein, and only ...201627294137
the ribosomal transcription units of haplorchis pumilio and h. taichui and the use of 28s rdna sequences for phylogenetic identification of common heterophyids in vietnam.heterophyidiasis is now a major public health threat in many tropical countries. species in the trematode family heterophyidae infecting humans include centrocestus formosanus, haplorchis pumilio, h. taichui, h. yokogawai, procerovum varium and stellantchasmus falcatus. for molecular phylogenetic and systematic studies on trematodes, we need more prospective markers for taxonomic identification and classification. this study provides near-complete ribosomal transcription units (rtu) from haplorc ...201728069063
intestinal helminths recovered from humans in xieng khouang province, lao pdr with a particular note on haplorchis pumilio infection.a survey of intestinal helminths was undertaken in riparian people in xieng khouang province, lao pdr. fecal specimens were collected from 643 people (289 males and 354 females) residing in 4 districts (nonghet, kham, phoukout, and pek) and were examined by the kato-katz technique. the overall helminth egg positive rate was 41.2%, and hookworms revealed the highest prevalence (32.7%) followed by trichuris trichiura (7.3%) and ascaris lumbricoides (5.6%). the positive rate for small trematode egg ...201526323842
molecular phylogenetics of centrocestus formosanus (digenea: heterophyidae) originated from freshwater fish from chiang mai province, thailand.this study aimed to investigate the morphology and reconstruct the phylogenetic relationships of centrocestus formosanus originating from 5 species of freshwater fish, i.e., esomus metallicus, puntius brevis, anabas testudineus, parambassis siamensis, and carassius auratus, in chiang mai province, thailand. sequence-related amplified polymorphism (srap) and phylogeny based on internal transcribed spacer 2 (its2) and mitochondrial cytochrome c oxidase subunit 1 (co1) were performed. the results s ...201728285504
helminth parasites of finfish commercial aquaculture in latin america.latin america has tripled production by aquaculture up to 78 million tonnes in the past 20 years. however, one of the problems that aquaculture is facing is the presence of helminth parasites and the diseases caused by them in the region. in this review we have collected all the available information on helminths affecting commercial aquaculture in latin america and the caribbean (lac), emphasizing those causing serious economic losses. monogeneans are by far the most common and aggressive paras ...201727976599
comparative risk of liver and intestinal fluke infection from either wild-caught or cultured fish in vietnam.a survey for fish-borne zoonotic trematode (fzt) metacercariae in fish from the northern mountain region of vietnam was conducted from may to august 2014. the major objective was to evaluate the impact of water body types on the prevalence of fzt. a total of 846 fish (31 species) were collected from three water body types, including aquaculture ponds, rivers, and reservoirs. a pepsin digestion method was used for the recovery of metacercariae from fish. overall, 29 of the 31 fish species were in ...201627828767
centrocestus formosanus (trematoda: heterophyidae) in melanoides tuberculata (gastropoda: thiaridae) from vila do abraão, ilha grande, rio de janeiro, brazil.pleurolophocercous cercariae found in the invasive gastropod melanoides tuberculata (müller, 1774) collected in a stream of the vila do abraão, ilha grande, angra dos reis, rio de janeiro, brazil were used for experimental infection that enabled the identification of the heterophyid trematode centrocestus formosanus (nishigori, 1924). the parasite has been found in the locality since 2007, after two years of the introduction of m. tuberculata. recently, from a sample of 483 specimens collected i ...201627599102
prevalence of trematode larvae in intermediate hosts: snails and fish in ko ae sub-district of khueang nai, ubon ratchathani province, thailand.ko ae sub-district of khueang nai, ubon ratchathani province, thailand is located in an endemic area for opisthorchis viverrini and other fish-borne zoonotic trematodes (fzt) infection. this study shows the status in ko ae sub-district of fzt infection based on availability of intermediate hosts and necessary requirements for the transmission of fzt. a cross-sectional survey of intermediate hosts of fzt, including bithynia siamensis goniomphalos and cyprinoid fish, was conducted from april 2013 ...201627405122
the first record of centrocestus formosanus (nishigori, 1924) (digenea: heterophyidae) in egypt.the life cycle of centrocestus formosanus (digenea: heterophyidae) was to be successfully completed in the laboratory in the present study. hundreds of the thiarid snail, melanoides tuberculata, were collected from the main water course mansouriya canal, giza governorate, egypt. the snails were individually exposed to artificial light to determine possible infection with trematode larvae. fifteen snails were found infected with opthalmopleurolophocercous cercariae (infection index of 1.97). thes ...201627328972
discrimination 28s ribosomal gene of trematode cercariae in snails from chiang mai province, thailand.trematode cercariae are commonly found in many freshwater gastropods. these cercariae can serve to identify the occurrence of such trematodes as centrocestus formosanus, haplorchis taichui, haplorchoides sp, and stellantchasmus falcatus, which are important parasites in chiang mai province, thailand. as the species of these cercariae cannot be identified accurately based on morphology, this study employed sequencing of a fragment of 28s ribosomal dna and phylogenetic analysis to identify the tre ...201627244956
prevalence of fish-borne trematodes of the family heterophyidae at pasak cholasid reservoir, thailand.the prevalence of fish-borne trematodes was investigated in various species of freshwater fish at pasak cholasid reservoir in thailand. the samples were collected from fish markets around the reservoir between june 2011 and may 2012. a total of 789 fish samples were classified into 25 species. the metacercariae (i.e., the larval stage of trematodes) were examined from 4 parts of the fish body, and evaluated using the compression method. ten species from two families of the fish collected were fo ...201626796861
infection status of zoonotic trematode metacercariae in fishes from vientiane municipality and champasak province in lao pdr.the infection status of fishborne zoonotic trematode (fzt) metacercariae was investigated in fishes from 2 localities of lao pdr. total 157 freshwater fishes (17 species) were collected in local markets of vientiane municipality and champasak province in december 2010 and july 2011, and each fish was examined by the artificial digestion method. total 6 species of fzt metacercariae, i.e., opisthorchis viverrini, haplorchis taichui, haplorchis yokogawai, haplorchis pumilio, centrocestus formosanus ...201526323843
host preference of an introduced 'generalist' parasite for a non-native host.parasites can invade new ecosystems if they are introduced with their native hosts or if they successfully infect and colonise new hosts upon arrival. here, we ask to what extent an introduced parasite demonstrates specialisation among novel host species. infection surveys across three field sites in gatun lake, panama, revealed that the invasive peacock bass, cichla monoculus, was more commonly infected by the introduced trematode parasite centrocestus formosanus than were three other common ci ...201526056736
experimental centrocestiasis: worm burden, morphology and fecundity of centrocestus formosanus (trematoda: heterophyidae) in dexamethasone immunosuppressed mice.centrocestus formosanus is an intestinal foodborne trematode with medical and veterinary importance that remains with the pathological and immunological aspects of the infection in definitive host poorly studied. in the present study, we evaluated the effects of pharmacological immunosuppression by glucocorticoids in experimental centrocestiasis. mice of the akr/j strain were orally inoculated with 100 metacercariae of c. formosanus obtained in naturally infected fish (australoheros facetus) col ...201525724856
metacercarial infection of wild nile tilapia (oreochromis niloticus) from brazil.fingerlings of oreochromis niloticus collected in an artificial urban lake from belo horizonte, minas gerais, brazil, were evaluated for natural infection with trematodes. morphological taxonomic identification of four fluke species was performed in o. niloticus examined, and the total prevalence of metacercariae was 60.7% (37/61). centrocestus formosanus, a heterophyid found in the gills, was the species with the highest prevalence and mean intensity of infection (31.1% and 3.42 (1-42), resp.), ...201425485302
a malacological survey in the manso power plant, state of mato grosso, brazil: new records of freshwater snails, including transmitters of schistosomiasis and exotic species.schistosomiasis is a parasitic disease of public health concern in brazil, and the construction of hydroelectric dams, in addition to increasing permanent human settlement and tourism, has created conditions suitable for the establishment of mollusks that can transmit schistosomiasis. such areas require a number of actions to prevent the establishment of schistosomiasis. this paper reports on a freshwater malacological survey carried out in the geographical area of the manso power plant.201425229292
zoonotic trematode metacercariae in fish from phnom penh and pursat, cambodia.a survey was performed to investigate the infection status of freshwater fish with zoonotic trematode metacercariae in phnom penh and pursat province, cambodia. all collected fish with ice were transferred to our laboratory and examined using the artificial digestion method. in fish from phnom penh, 2 kinds of metacercariae (opisthorchis viverrini and haplorchis yokogawai) were detected. o. viverrini metacercariae were positive in 37 (50.0%) of 74 fish in 11 species (average no. metacercariae/fi ...201424623879
experimental exposure of adult san marcos salamanders and larval leopard frogs to the cercariae of centrocestus formosanus.the gill parasite centrocestus formosanus (trematoda: heterophyidae) is an exotic parasite of concern in texas because it has been shown to infect multiple threatened and endangered fish species. the purpose of this study was to determine if c. formosanus could present a threat to larval anurans, as well as threatened neotenic salamanders endemic to the spring-fed systems of texas. we exposed adults of the san marcos salamander eurycea nana (caudata: plethodontidae) and tadpoles of the rio grand ...201424303882
hyperendemicity of haplorchis taichui infection among riparian people in saravane and champasak province, lao pdr.in this study, we found that haplorchis taichui, a heterophyid intestinal fluke, is highly prevalent, with heavy worm loads, among riparian people in saravane and champasak province, lao pdr. fecal specimens were collected from 1,460 people (717 men and 743 women) in 12 riparian (mekong river) districts and were examined by the kato-katz fecal smear technique. the overall helminth egg positive rate was 78.8% and 66.4% in saravane and champasak province, respectively. the positive rate for small ...201323864741
does the trematode centrocestus formosanus affect the locomotory activity of the mollusc melanoides tuberculatus?melanoides tuberculatus (müller, 1774) (thiaridae), an introduced gastropod mollusc with a wide geographical distribution in the neotropics, is the intermediate host of the trematode centrocestus formosanus (nishigori, 1924) (heterophyidae). this parasite is considered to be pathogenic to humans. the aim of the present work was to evaluate the locomotory activity of uninfected m. tuberculatus compared with those naturally infected with c. formosanus.201323574763
experimental infection of swiss and akr/j mice with centrocestus formosanus (trematoda: heterophyidae).in order to better understand the biology of centrocestus formosanus in a definitive host model, mice of swiss and akr/j strains were experimentally infected with 100 metacercariae of the parasite. fourteen days post-infection, the rodents were killed and adult trematodes were recovered from the small intestine. the percentage of parasite recovery from akr/j mice (11.4%) was significantly higher than that from swiss mice (5.3%). moreover, trematodes recovered from the akr/j strain were more deve ...201323563770
fishborne trematode metacercariae in luang prabang, khammouane, and saravane province, lao pdr.fishborne trematode (fbt) metacercariae were investigated in fish from 3 provinces of lao pdr. total 242 freshwater fish of 40 species were collected in local markets of luang prabang (59 fish of 16 species), khammouane (81 fish of 19 species), and saravane (97 fish of 14 species), and each of them was examined by artificial digestion method. four species of metacercariae (opisthorchis viverrini, haplorchis taichui, haplorchis yokogawai, and centrocestus formosanus) were detected. o. viverrini w ...201323467784
an evaluation of three sampling methods to monitor a digenetic trematode centrocestus formosanus in a spring-fed ecosystem.centrocestus formosanus is a digenetic trematode from asia that parasitizes multiple hosts and is a concern in the comal river, texas, usa, because of its negative effects on the endangered fountain darter etheostoma fonticola. to determine a practical sampling method to monitor c. formosanus in the comal river, we evaluated three sampling methods using wild-caught fish, caged fish reared in the laboratory, and cercariometry. cercariometry detected significant spatial and temporal patterns of ce ...201323433146
metagonimus yokogawai: metacercariae survey in fishes and its development to adult worms in various rodents.a parasitological survey for metagonimus yokogawai metacercariae was carried out by examining a total of 321 freshwater fish comprising of 7 species. of the 321 fish samples examined, 182 (56.7%) were found to be infected with m. yokogawai metacercariae. the prevalence of m. yokogawai metacercariae in opsariichthys pachycephalus was 93.4% (86/92), zacco platypus 75.0% (30/40), distoechodon turmirostris 61.3% (38/62), varicorhinus barbatulus 56.5% (13/23), hemibarbus labeo 33.3% (1/3), acrossoche ...201323388732
a cross-sectional study on the potential transmission of the carcinogenic liver fluke opisthorchis viverrini and other fishborne zoonotic trematodes by aquaculture fish.throughout southeast asia and china, eating raw and or partially cooked cyprinid fish causes liver (hepatobiliary) disease and cancer (cholangiocarcinoma) due to fishborne zoonotic trematodes (fzt), in particular clonorchis sinensis and opisthorchis viverrini. the primary source of transmission is by native fish, but aquaculture fish are also reported to have high infective potential. here, a cross-sectional survey of fzt in fish farms was conducted in an endemic area in khon kaen province, thai ...201323320421
foodborne trematode metacercariae in fish from northern vietnam and their adults recovered from experimental hamsters.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 p ...201223230329
centrocestus formosanus (heterophyidae): human infections and the infection source in lao pdr.in lao people's democratic republic (pdr), we detected 7 patients infected with centrocestus formosanus (1-122 adult specimens) after praziquantel treatment and purgation, together with several other trematode species including opisthorchis viverrini and haplorchis taichui. the patients were all men, 23-42 yr-of-age. three subjects were from vientiane municipality and 1 each were from khammouane, saravane, champassak, and xiengkhouang province. the patients had frequently eaten raw freshwater fi ...201323116489
metacercariae of centrocestus formosanus (trematoda: heterophyidae) in australoheros facetus (pisces: cichlidae) in brazil.heterophyid metacercariae were found in the gills of australoheros facetus (jenyns, 1842) collected from the pampulha reservoir, belo horizonte, minas gerais, brazil, between february and april 2010. the cysts were counted and used to perform experimental studies (artificial excystment and infection of mice). fifty specimens of a. facetus were analyzed and it was found that the prevalence of infection was 100% and mean infection intensity was 134 metacercariae/fish (range: 4-2,510). significant ...201223070454
the natural infection of melanoides tuberculata (müller, 1774) (mollusca: gastropoda) by centrocestus formosanus (nishigori, 1924) (platyhelminthes: trematoda) in paranoá lake, brasília, brazil. 201222735153
evaluation of the role of rats as reservoir hosts for fishborne zoonotic trematodes in two endemic northern vietnam fish farms.fishborne zoonotic trematodes (fzts) pose a food safety risk for the aquaculture industry in vietnam. the risk of being infected from eating raw fish applies not only to humans but also to domestic animals which can serve as reservoir hosts in fish farms. the role of rodents, commonly found in fish farms, as reservoir hosts has not been adequately evaluated. to study this question, commensal and rice field rats were collected from fish farms in nghia lac and nghia phu communes, nam dinh province ...201222592535
prevalence and intensity of fish-borne zoonotic trematodes in cultured freshwater fish from rural and urban areas of northern vietnam.consumption of raw freshwater fish produced in both rural farm and urban wastewater ponds is a common practice in vietnam. the present study assessed the risk of fish-borne zoonotic trematode (fzt) infection from fish raised in both these aquaculture systems in northern vietnam. the diversity, prevalence, and infection intensity of fzt metacercariae in 1,500 freshwater fish collected from 6 sites located in rural and urban areas in northern vietnam were investigated. the specific diagnosis of sp ...201222471793
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