Infecção experimental de Lymnaea columella por Fasciola hepatica

Ueta, Marlene Tiduko

doi:10.1590/s0034-89101980000100004

Cited by 4 publications

(5 citation statements)

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“…Emergence of cercariae was only observed after 61 DPI. These results are similar to those of Ueta (1980), who carried out experimental infections of L. columella with F. hepatica , obtaining spontaneous elimination of cercariae at 57–60 DPI. Rezende et al (1973) obtained cercariae from 44–58 DPI.…”

Section: Discussionsupporting

confidence: 90%

“…The geographical variation of Lymnaea species also influences their susceptibility to infection by F. hepatica or development of the rediae (Ueta, 1980; Dacal et al , 1988; Gasnier et al , 2000; Goumghar et al , 2001). This study was the first attempt to test the susceptibility of this strain.…”

Section: Discussionmentioning

confidence: 99%

“…Lymnaeid snails have a wide geographical distribution in Brazil and Lymnaea columella ( = Pseudosuccinea columella ) is the most frequent intermediate host of F. hepatica in southern and southeastern Brazil (Paraense, 1982, 1983, 1986; Amato et al , 1986). Some authors have suggested that geographical variation influences susceptibility to infection by F. hepatica or development of this parasite in the snail (Ueta, 1980; Dacal et al , 1988; Gasnier et al , 2000; Goumghar et al , 2001.) In the Brazilian state of Minas Gerais, prevalence of fascioliasis in cattle is highest in the south (Coelho & Lima, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Influence of shell size ofLymnaea columellaon infectivity and development ofFasciola hepatica

2008

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Experimental infections of Lymnaea columella with Fasciola hepatica were carried out to determine the influence of shell size on the infection rate and on the outcome of rediae and cercariae. Snails were divided into seven groups according to shell size: 2-4 mm, 5-6 mm, 7-8 mm, 9-10 mm, 11-12 mm, 13-14 mm and 15 mm or more. One hundred snails in each group were infected by using four miracidia for each snail. Snails with larger shell size showed a lower infection rate, the groups presenting the highest (79%) and lowest (2%) proportions of positives being those of 5-6 mm and 15 mm or more, respectively. Cercariae were present in 21% of them at 31 days post-infection, and cercarial shedding was observed 61 days post-infection. It was concluded that there is a non-linear negative association between shell size and infection rate.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of shell size ofLymnaea columellaon infectivity and development ofFasciola hepatica

2008

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“…A determinação do qüinquagésimo sexto dia para avaliação, de um modo geral, não se afastou dos resultados de outros autores como Furmaga e Guhdlach (1967), que encontraram o período de 42 a 63 dias, Rouridelaud (1980) 42 dias, Ueta (1980) Ueta (1979), trabalhando com L. columella, só obteve metacercárias através do sacrifício dos moluscos com sinais de padecimento.…”

Section: Discussão E Conclusõesunclassified

Suscetibilidade de Lymnaea columella Say, 1817 à infecção por Fasciola hepatica L., 1758

Gomes¹,

Freire²

2001

RBCV

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São apresentadas as espécies Lymnaea columella Say, 1817 da família Lymnaeidae Rafinesque e Stenophysa marmorata (Guilding, 1828) da família Physidae Fitzinger, como as únicas espécies dos respectivos gêneros, encontradas no Estado do Rio de Janeiro. Após a identificação das espécies que ocorriam neste Estado, o estudo foi direcionado para a identificação das espécies de moluscos que possuíam real potencial como hospedeiro intermediário de Fasciola hepatica L., 1758, avaliação da suscetibilidade a miracídios de F. hepatica, bem como fatores que influenciavam na infecção e na ação das formas larvais do trematódeo sobre o molusco. As observações demonstraram que: L. columella foi encontrada naturalmente infectada por F. hepatica, tendo-se obtido êxito nas infecções experimentais, o que não ocorreu com S. marmorata; infecções com três miracídios/ molusco são ideais para obtenção de maior número de moluscos sobreviventes infectados e que infecções com cinco miracídios/molusco ou mais, podem produzir infecções mais intensas, porém ocasionam morte precoce; o maior número de metacercárias foi obtido nas infecções com três miracídios; L. columella não resiste a infecções com 40 ou mais miracídios; a proveniência dos ovos de F. hepatica com relação aos hospedeiros vertebrados (8os taurus L. e Ovis aries L.) não influenciou nos resultados obtidos nas infecções.

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“…Among them, the use of 14 cm Petri dishes with dried lettuce and dead grass as food for snails and live spring moss for spring water oxygenation gave the best results for survival of infected snails [ 19 ]. In contrast, the breeding of the more aquatic P. columella in aquaria or in Petri dishes with fresh lettuce for snail food seems to be easier [ 1 , 2 , 4 , 8 , 15 , 27 ]. In view of these findings, the following two questions arose: was the use of P. columella easier and more profitable to produce F. hepatica metacercariae?…”

Section: Introductionmentioning

confidence: 99%

Fasciola hepatica: comparative metacercarial productions in experimentally-infectedGalba truncatulaandPseudosuccinea columella

2015

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As large numbers of metacercariae of Fasciola hepatica are necessary for research, experimental infections of Galba truncatula and Pseudosuccinea columella with this digenean were carried out to determine the better intermediate host for metacercarial production and, consequently, the most profitable snail for decreasing the cost price of these larvae. Pre-adult snails (4 mm in shell height) originating from two populations per lymnaeid species were individually exposed to two or five miracidia, raised at 23 °C and followed for cercarial shedding up to their death. Compared to values noted in G. truncatula, the survival of P. columella on day 30 post-exposure was significantly greater, while the prevalence of F. hepatica infection was significantly lower. In the four P. columella groups, metacercarial production was significantly greater than that noted in the four groups of G. truncatula (347–453 per cercariae-shedding snail versus 163–275, respectively). Apart from one population of G. truncatula, the use of five miracidia per snail at exposure significantly increased the prevalence of F. hepatica in P. columella and the other population of G. truncatula, whereas it did not have any clear effect on the mean number of metacercariae. The use of P. columella for experimental infections with F. hepatica resulted in significantly higher metacercarial production than that noted with G. truncatula, in spite of a lower prevalence for the former lymnaeid. This finding allows for a significant decrease in the cost price of these larvae for commercial production.

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Infecção experimental de Lymnaea columella por Fasciola hepatica

Cited by 4 publications

References 12 publications

Influence of shell size ofLymnaea columellaon infectivity and development ofFasciola hepatica

Influence of shell size ofLymnaea columellaon infectivity and development ofFasciola hepatica

Suscetibilidade de Lymnaea columella Say, 1817 à infecção por Fasciola hepatica L., 1758

Fasciola hepatica: comparative metacercarial productions in experimentally-infectedGalba truncatulaandPseudosuccinea columella

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