Response to manuscript ‘Is <i>Opisthorchis viverrini</i> an avian liver fluke?’

Dorny, Pierre; Dao, T.V.; Victor, Björn; Nguyen, Thi Viet Ha; Gabriël, Sarah

doi:10.1017/s0022149x13000722

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…BD2013 and O. parageminus . Both were found in ducks in Vietnam, but some morphological differences seem to exist [ 11 ]. At this stage, we prefer to leave the question open, pending future morphological and molecular work.…”

Section: Discussionmentioning

confidence: 99%

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Updated molecular phylogenetic data for Opisthorchis spp. (Trematoda: Opisthorchioidea) from ducks in Vietnam

et al. 2017

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BackgroundAn opisthorchiid liver fluke was recently reported from ducks (Anas platyrhynchos) in Binh Dinh Province of Central Vietnam, and referred to as “Opisthorchis viverrini-like”. This species uses common cyprinoid fishes as second intermediate hosts as does Opisthorchis viverrini, with which it is sympatric in this province. In this study, we refer to the liver fluke from ducks as “Opisthorchis sp. BD2013”, and provide new sequence data from the mitochondrial (mt) genome and the nuclear ribosomal transcription unit. A phylogenetic analysis was conducted to clarify the basal taxonomic position of this species from ducks within the genus Opisthorchis (Digenea: Opisthorchiidae).MethodsAdults and eggs of liver flukes were collected from ducks, metacercariae from fishes (Puntius brevis, Rasbora aurotaenia, Esomus metallicus) and cercariae from snails (Bithynia funiculata) in different localities in Binh Dinh Province. From four developmental life stage samples (adults, eggs, metacercariae and cercariae), the complete cytochrome b (cob), nicotinamide dehydrogenase subunit 1 (nad1) and cytochrome c oxidase subunit 1 (cox1) genes, and near-complete 18S and partial 28S ribosomal DNA (rDNA) sequences were obtained by PCR-coupled sequencing. The alignments of nucleotide sequences of concatenated cob + nad1 + cox1, and of concatenated 18S + 28S were separately subjected to phylogenetic analyses. Homologous sequences from other trematode species were included in each alignment.ResultsPhylogenetic trees were inferred from concatenated (cob + nad1 + cox1) nucleotide sequences and combined 18S + 28S nucleotide sequences of five Opisthorchis sp. BD2013 samples and additional reference taxa. Both trees demonstrated the anticipated clustering of taxa within the superfamily Opisthorchioidea, the paraphyly of the genus Opisthorchis and the sister-species relationship of Opisthorchis sp. BD2013 with O. viverrini.ConclusionsWhile it is likely that Opisthorchis sp. BD2013 is distinct from O. viverrini, it is clearly a sister taxon of O. viverrini within the limited number of Opisthorchis species for which appropriate sequence data are available. The new sequences provided here will assist the diagnosis and the taxonomic clarification of the opisthorchiid species.

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Section: Discussionmentioning

confidence: 99%

“…parageminus that was previously reported from ducks in Vietnam [ 8 – 10 ]. However, Dorny et al [ 11 ] considered that their “ Opisthorchis viverrini -like” species exhibited some morphological differences from O. parageminus . We now propose to use the working name “ Opisthorchis sp.…”

Section: Introductionmentioning

confidence: 99%

Updated molecular phylogenetic data for Opisthorchis spp. (Trematoda: Opisthorchioidea) from ducks in Vietnam

et al. 2017

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“…Interestingly, O. viverrini infection was reported in domestic ducks ( Anas platyrhynchos ) in this area [ 7 ]. Although morphological and genetic characteristics of the duck isolate are slightly different from those of human isolates from this area and from other endemic countries, a possible role of aquatic birds as reservoir hosts for this zoonotic fluke was suggested [ 7 , 8 ]. The validity of a O. viverrini duck genotype has been contested [ 9 , 10 ], but Dorny et al [ 8 ] argued that the high identity of the ITS-2 partial sequence of the duck isolates to human isolates of O. viverrini justifies the classification of the duck flukes as O. viverrini -like.…”

mentioning

confidence: 99%

“…Although morphological and genetic characteristics of the duck isolate are slightly different from those of human isolates from this area and from other endemic countries, a possible role of aquatic birds as reservoir hosts for this zoonotic fluke was suggested [ 7 , 8 ]. The validity of a O. viverrini duck genotype has been contested [ 9 , 10 ], but Dorny et al [ 8 ] argued that the high identity of the ITS-2 partial sequence of the duck isolates to human isolates of O. viverrini justifies the classification of the duck flukes as O. viverrini -like. Two genotypes of a species occurring in the same endemic area and sharing the same intermediate hosts may lead to hybridization/introgression [ 11 ] and make the epidemiology of the disease more complex.…”

mentioning

confidence: 99%

“…The role of ducks as reservoir hosts of some zoonotic small intestinal flukes was confirmed [ 18 ], and its infection with O. viverrini (small liver fluke) was reported [ 7 ]. Although the zoonotic potential of the O. viverrini duck genotype has yet to be confirmed [ 8 ], the high prevalence and intensity of O. viverrini in ducks indicate that large numbers of parasite’s eggs are spread into water bodies on which ducks scavenge every day. These eggs can be dispersed with water to wide geographical areas by the strong flow of streams, irrigation canals, and by annual flooding of rice fields or rivers.…”

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confidence: 99%

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Prevalence of <i>Opisthorchis viverrini</i>-Like Fluke Infection in Ducks in Binh Dinh Province, Central Vietnam

et al. 2016

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Following the first report of Opisthorchis viverrini infection in a domestic duck in Phu My District of Binh Dinh Province, Central Vietnam, many other cases were observed in the province. We determined the infection rate and intensity of O. viverrini infection in ducks in 4 districts of the province. A total of 178 ducks were randomly selected from 34 farms for examination of flukes in the liver and gall bladder. An infection rate of 34.3% (range 20.7-40.4% among districts) was found; the intensity of infection was 13.8 worms per infected duck (range 1-100). These findings show the role of ducks as a host for O. viverrini, duck genotype, which is sympatric with the human O. viverrini genotype in this province. It also stresses the need for investigations on the zoonotic potential and the life cycle of this parasite.

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RAW ATTITUDES: Socio-Cultures, Altered Landscapes, and Changing Perceptions of an Underestimated Disease

Grundy-Warr,

Andrews,

Khuntikeo

et al. 2023

Recent Results in Cancer Research

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Response to manuscript ‘Is Opisthorchis viverrini an avian liver fluke?’

Abstract: Abstract

Cited by 7 publications

References 3 publications

Updated molecular phylogenetic data for Opisthorchis spp. (Trematoda: Opisthorchioidea) from ducks in Vietnam

Updated molecular phylogenetic data for Opisthorchis spp. (Trematoda: Opisthorchioidea) from ducks in Vietnam

Prevalence of <i>Opisthorchis viverrini</i>-Like Fluke Infection in Ducks in Binh Dinh Province, Central Vietnam

RAW ATTITUDES: Socio-Cultures, Altered Landscapes, and Changing Perceptions of an Underestimated Disease

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