<i>Trichobilharzia maegraithi</i>sp.nov., a cause of cercarial dermatitis in Thailand

Kruatrachue, M; Bhaibulaya, Manoon; Chesdapan, Charin; Harinasuta, C

doi:10.1080/00034983.1968.11686531

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…Furthermore, snails of Lymnaeidae, Physidae, and Planorbidae are often found to be the intermediate host of bird schistosomes (Horák et al 1999(Horák et al , 2010(Horák et al , 2015Brant and Loker 2009;Marszewsk et al 2018). Although no reports of human cercarial dermatitis caused by avian schistosomes have been found in Thailand, furcocercous cercariae of Trichobilharzia maegraithi were reported from the northeast and north of Thailand, first in 1967, where infected ducks occurred in a pond in Kalasin Province with infected Radix (Lymnaea) rubiginosa (Kruatrachue et al 1968). In addition, six R. (L.) rubiginosa from freshwater reservoirs in Phayao Province, north Thailand, were infected with T. regenti (Japa et al 2021).…”

Section: Discussionmentioning

confidence: 99%

Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Krailas¹,

Namchote²,

Komsuwan³

et al. 2022

EvolSyst

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A cercarial dermatitis outbreak occurred in Chana district, Songkhla Province, South Thailand, between August and October 2020. A total of 359 cases with cercarial dermatitis were confirmed with three cases of skin biopsy. The species of potential trematodes from infected snails were investigated, and the prevalence of infestation with schistosomes was described. As part of our ongoing studies of trematode diversity in freshwater systems, using morphological traits and sequence data to differentiate species, this study aimed to provide insights into the parasite species that cause cercarial dermatitis in the outbreak area and improve our understanding of parasite species distribution. Snail samples were collected in December 2020 and September and October 2021. Five main areas of outbreaks were investigated, and snails were collected by scooping and examined for infection with cercariae. The cercariae were characterized on the basis of morphological features. We found two species of snails to be infected, viz. Indoplanorbis exustus and Bithynia siamensis siamensis, with infection rates of 2.05% (12/586) and 7.93% (23/290), respectively. Three species of trematodes were found in B. s. siamensis, viz. Gastrothylax crumenifer, Astiotrema monticellii, and Loxogenes liberum. Moreover, three species of trematodes were found in Indoplanorbis exustus, viz. Clinostomum giganticum, Echinostoma spiniferum, and Schistosoma indicum. The latter is a ruminant schistosome, which causes the outbreak of cercarial dermatitis in the area. They were genetically analyzed using the internal transcribed spacer subunit II region to confirm the species identity at generic and infrageneric levels.

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Section: Discussionmentioning

confidence: 99%

Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Krailas¹,

Namchote²,

Komsuwan³

et al. 2022

EvolSyst

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“…Although T. maegraithi spp. nov. was first recorded in Thailand in 1967 by means of morphological identification [ 44 ], its molecular identity has never been confirmed. Detection of Trichobilharzia cercariae infecting R. rubiginosa in this study demonstrated that the spreading of avian blood fluke cercariae is not restricted to Europe or America, but also occurs in the Thai aquatic environment.…”

Section: Discussionmentioning

confidence: 99%

Parasitological and molecular characterization of the avian schistosomatid cercariae infecting lymnaeidae snails in Phayao, Northern Thailand

et al. 2021

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Background and Aim: Cercarial dermatitis or swimmer's itch is an allergic skin reaction caused by penetrating cercaria of animal blood flukes. It is considered as a zoonotic water-borne skin condition that is found globally. Among the schistosomatid trematodes, avian schistosomes are the most responsible for cercarial dermatitis. Very little is known regarding the occurrence of dermatitis-causing cercariae in Thailand. Therefore, the objective of this study was to preliminarily investigate the presence of larval blood fluke infection among local lymnaeidae snails in Phayao by the incorporation of morphological and molecular methods. Materials and Methods: Overall 500 Radix (Lymnaea) rubiginosa (Michelin, 1831) were collected from freshwater reservoirs near Phayao Lake in San Kwan village in Phayao, Thailand, from October to December 2020. The snails were examined for avian blood fluke infection by the cercarial shedding technique followed by morphological and molecular characterization. Results: Only one type of furcocercous cercaria was observed to emerge from six infected snails (1.2%). Our molecular analyses demonstrated that the emerging cercariae showed most similarity to either the 28S ribosomal RNA gene (28S rDNA) or cytochrome oxidase C subunit 1 gene (cox1 or COI) sequences to those of Trichobilharzia species. In addition, phylogenetic tree analyses of both loci revealed similar results; the emerging cercariae were consistently clustered together with Trichobilharzia regenti. Conclusion: Our results clearly confirmed that the detected furcocercous cercariae belonged to the genus Trichobilharzia and displayed the highest homology to T. regenti. This study provides important data on the occurrence of dermatitis causing cercariae infection among local lymnaeidae snails, encouraging effective management, and control measures for this zoonotic infectious disease.

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“…Na África, Ásia e Oceania, os relatos de DC por parasitos de aves são escassos, existindo registros na África do Sul (3,16), Austrália (4,6,57), China (50,53), Índia (1), Irã (22), Japão (33,80), Nova Zelândia (56), Tailândia (44), dentre outros países. Na América do Sul, casos de DC por esquistosomatídeos de aves foram apenas relatados na Argentina (11,82,83) (29,36,86).…”

Section: Breve Histórico E Distribuiçãounclassified

Dermatite cercariana por esquistossomatídeos de aves: É possível a ocorrência de casos no Brasil?

Pinto¹,

Mati²,

Melo³

2012

Rev Patol Trop

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A dermatite cercariana causada por larvas de esquistossomatídeos de aves tem sido considerada uma enfermidade emergente. Embora ainda não haja relato de casos no Brasil, algumas espécies destes trematódeos já foram encontradas em aves e os potenciais hospedeiros intermediários (moluscos) estão amplamente distribuídos pelo país. Em razão da dificuldade de diagnóstico clínico diferencial da dermatite causada por larvas de Schistosoma mansoni, é possível que outras dermatites cercarianas sejam negligenciadas em nosso meio. Neste trabalho são discutidos aspectos relacionados à identificação de áreas de risco, à pesquisa de formas larvares em moluscos aquáticos, às alterações clínicas verificadas em humanos, ao tratamento e à profilaxia desta enfermidade. Concluiu-se que são necessários esforços para o diagnóstico da dermatite cercariana por outros esquistossomatídeos e também que sejam desenvolvidos estudos visando ampliar o conhecimento sobre a ocorrência destes parasitos no Brasil.

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Trichobilharzia maegraithisp.nov., a cause of cercarial dermatitis in Thailand

Cited by 9 publications

References 6 publications

Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Parasitological and molecular characterization of the avian schistosomatid cercariae infecting lymnaeidae snails in Phayao, Northern Thailand

Dermatite cercariana por esquistossomatídeos de aves: É possível a ocorrência de casos no Brasil?

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Trichobilharzia maegraithisp.nov., a cause of cercarial dermatitis in Thailand

Cited by 9 publications

References 6 publications

﻿Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

﻿Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Parasitological and molecular characterization of the avian schistosomatid cercariae infecting lymnaeidae snails in Phayao, Northern Thailand

Dermatite cercariana por esquistossomatídeos de aves: É possível a ocorrência de casos no Brasil?

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Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand

Cercarial dermatitis outbreak caused by ruminant parasite with intermediate snail host: schistosome in Chana, South Thailand