Epidemiology of Fasciola hepatica infection in the Paraíba river valley, São Paulo, Brasil

Amato, Suzana B.; Rezende, Hugo E.B. De; Gomes, Delir Corrêa; Freire, Nicolau Maués da Serra

doi:10.1016/0304-4017(86)90115-9

Cited by 24 publications

(19 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the Patagonia region of Argentina, Kleiman et al (2007) reported high prevalence of infected animals (52%) and infected L. viatrix, which ranged from 0.9 to 14%, depending on the sampling site and the season, with no infected mollusks detected in the spring. In the valley of the Paraíba River, infected L. columella was found in every month except December during a three-year study (AMATO et al, 1986). In the present study, the fact that no infected mollusks were found on the farms with infected cattle may be explained by the low rate of natural infection (2.96%) reported by Lima et al (2009), who found infected mollusks in only one of the 16 municipalities with infected cattle.…”

Section: Resultscontrasting

confidence: 48%

Distribution of bovine fasciolosis and associated factors in south Espírito Santo, Brazil: an update

Martins

Avelar

Bernardo

et al. 2014

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

The geographical distribution and factors associated with bovine fasciolosis in the south of Espírito Santo were updated and the prevalences of this disease and of snails of the genus Lymnaea in the municipality of Jerônimo Monteiro were calculated. In the first stage, fecal samples were collected from 10% of the herds of 115 farms in 23 municipalities and interviews were conducted with owners. Generalized linear mixed models were used. In the second stage, in Jerônimo Monteiro municipality, feces and mollusks were collected from all farms registered in the milk cooperatives in the region. The mollusks were identified and examined for infection by Fasciola hepatica. Fasciolosis was diagnosed in 18 (78%) of the 23 municipalities. Of the 1157 fecal samples examined, 19.01% were positive for eggs of F. hepatica. The final model shows statistical evidence of associations between positive farms and previous cases of fasciolosis and concomitant grazing of cattle with other definitive hosts. In the evaluated farms from the studied municipality the prevalence of fasciolosis and Lymnaea was of 66.7% and 23.8%, respectively. Mollusks were found in flooded areas and the animals' drinking water troughs. The wide geographical distribution of bovine fasciolosis in the south of Espírito Santo requires control measures to prevent its expansion towards the north of this state and other places characterized as F. hepatica free-infection.Keywords: Fasciola hepatica, Lymnaea, epidemiology. ResumoRealizou-se um estudo atualizado da distribuição geográfica e dos fatores associados à fasciolose bovina, no Sul do Estado do Espírito Santo, e calculadas a prevalência de moluscos do gênero Lymnaea no município de Jerônimo Monteiro. Na primeira etapa, coletaram-se amostras fecais de 10% dos rebanhos de 115 propriedades, em 23 municípios, e realizaram-se entrevistas com os proprietários. Modelos lineares generalizados mistos foram utilizados. Na segunda etapa, em Jerônimo Monteiro, coletaram-se fezes e moluscos em todas as propriedades cadastradas nas cooperativas de leite da região. Os moluscos foram identificados e examinados quanto à infecção por Fasciola hepatica. A fasciolose foi diagnosticada em 18 (78%) dos 23 municípios. Das 1157 amostras fecais examinadas, 19,01% foram positivas para ovos de F. hepatica. O modelo final mostra, concomitantemente, evidências estatísticas de associação entre propriedades positivas e casos anteriores de fasciolose e de pastoreio de bovinos com outros hospedeiros definitivos. Em Jerônimo Monteiro, a prevalência de fasciolose foi 66,7% e de Lymnaea 23,8%. Moluscos foram encontrados em áreas alagadas e em bebedouros dos animais. A ampla distribuição geográfica da fasciolose bovina, no Sul do Espírito Santo, requer medidas de controle que evitem sua expansão em direção ao Norte do Estado.Palavras-chave: Fasciola hepática, Lymnaea, epidemiologia.

show abstract

Section: Resultscontrasting

confidence: 48%

Distribution of bovine fasciolosis and associated factors in south Espírito Santo, Brazil: an update

Martins

Avelar

Bernardo

et al. 2014

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

show abstract

“…This study showed that the population of P. columella from Confins-MG is susceptible to F. hepatica, as reported for other populations of Brazilian P. columella from the Ribeira and Paraíba valleys, in the state of São Paulo (UETA 1980a, b;AMATO et al, 1986;OLIVEIRA et al, 2002), and from the meso-region of southern Minas Gerais and Pelotas, in the south of the country (COELHO et al, 2009). Recently, Dracz & Lima (2014) observed the spontaneous elimination of F. hepatica cercariae by this gastropod, from the municipalities São José da Lapa, and Pedro Leopoldo-MG.…”

Section: Discussionsupporting

confidence: 84%

Dynamics of haemocytes from Pseudosuccinea columella circulating infected by Fasciola hepatica

Ribeiro

Coaglio

Oliveira

et al. 2017

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

The lymnaeids are important in the epidemiology of Fasciola hepatica, a neglected and endemic zoonosis. The interaction between the internal defense system of Pseudosuccinea columella and F. hepatica has been little studied. In the present study the effect of infection by F. hepatica on P. columella circulating haemocytes was investigated. Changes in the average number of total circulating haemocytes have been observed at 30 minutes post-infection and 1, 7, 10, 14, 21, 28 and 50 days post-infection (dpi). Miracidia were observed head-foot and mantle at 30 minutes post-infection. Miracidia/Sporocysts in the mantle skirt 1 dpi, and fully formed sporocysts were observed in the head-foot at 7 dpi. Rediae became evident at 10 dpi and were located between the haemocoel and the muscles from 14 dpi; 50 dpi, the rediae in the digestive gland contained cercariae. The statistical analysis of the total haemocytes of P. columella infected by F. hepatica showed significant differences on the 30 minutes post-infection and 1, 14, 21, and 28 dpi in comparison to uninfected molluscs (0 dpi). Therefore, the interference observed on the internal defence system of P. columella may have direct association with the development of F. hepatica.Keywords: Fasciola hepatica, haemocytes, Pseudosuccinea columella. ResumoOs limnaeideos são importantes na epidemiologia de Fasciola hepatica, uma zoonose negligenciada e endêmica. A interação entre o sistema interno de defesa de Pseudosuccinea columella e F. hepatica tem sido pouco estudada. No presente estudo, investigou-se o efeito da infecção por F. hepatica nos hemócitos circulantes de P. columella. Alterações no número médio de hemócitos circulantes foram observadas aos 30 minutos e 1, 7, 10, 14, 21, 28 e 50 dias após a infecção (dpi). Miracídios foram observados na região cefalopodal e manto aos 30 minutos após a infecção. Miracídio/esporocistos foram observados no colar do manto ao 1 dpi, e esporocistos totalmente formados na região cefalopodal aos 7 dpi. Rédias tornam-se evidentes aos 10 dpi entre a hemocele e músculos a partir de 14 dpi; e rédias com cercárias próximas a glândula digestiva aos 50 dpi. A análise estatística dos hemócitos totais de P. columella infectados por F. hepatica demonstrou diferenças significativas nos 30 minutos pós-infecção e 1, 14, 21 e 28 dpi em comparação aos moluscos não infectados (0 dpi). Portanto, a interferência observada no sistema de defesa interna de P. columella pode ter associação direta com o desenvolvimento de F. hepatica.

show abstract

“…True percentages of infections in cattle are, therefore, likely to be higher than reported. Also, there is no direct relationship between infections in snails and in ruminant hosts (Amato et al, 1986) because metacercariae may never be consumed or they may encyst on herbage, hay or water long after snails are gone (Roberts & Suhardono, 1996). The actual distribution of snail species is dependent on seasonal variations in climate and therefore, snail sampling surveys should be conducted repeatedly in all climatic seasons to obtain an overview of these variations.…”

Section: Discussionmentioning

confidence: 99%

Trematode infections in freshwater snails and cattle from the Kafue wetlands of Zambia during a period of highest cattle–water contact

Phiri

Chota

et al. 2007

J. Helminthol.

View full text Add to dashboard Cite

A total of 984 snails, comprising nine species, were collected from six areas in the Kafue wetlands between August and October 2003 to assess larval trematode infections. Of these, 135 (13.7%) were positive. Most trematode infections were recorded from Lymnaea natalensis (42.8%), which harboured four of the five morphologically different cercariae found. No trematodes were recovered from Bellamya capillata, Biomphalaria pfeifferi, Melanoides tuberculata, Physa acuta and Cleopatra nswendweensis. One snail (0.2%) of 416 Bulinus snails shed brevifurcate-apharyngeate distome cercariae while three (0.7%) shed amphistomes. Gymnocephalous and longifurcate-pharyngeate distome were the commonest types of cercariae recorded while xiphidiocercaria was the least common. The highest prevalence rates of F. gigantica (68.8%) and amphistomes (50.0%) in cattle (n = 101) were in Chiyasa while those in Kaleya had the lowest (9.1 and 18.2%, respectively). In most habitats, infections were recorded in both cattle and snails. Critical determinants of infection may have been the distance of settlements and/or cattle kraals, the number of animals in nearby homesteads and the presence of susceptible host snails. This study suggests that fascioliasis and amphistomiasis could be major constraints of cattle production in the Kafue wetlands because favourable factors were available to introduce and maintain the infections. It further provides a starting point for some comprehensive studies on snail-related aspects of transmission and snail host ecology in Zambia.

show abstract

Epidemiology of Fasciola hepatica infection in the Paraíba river valley, São Paulo, Brasil

Cited by 24 publications

References 9 publications

Distribution of bovine fasciolosis and associated factors in south Espírito Santo, Brazil: an update

Distribution of bovine fasciolosis and associated factors in south Espírito Santo, Brazil: an update

Dynamics of haemocytes from Pseudosuccinea columella circulating infected by Fasciola hepatica

Trematode infections in freshwater snails and cattle from the Kafue wetlands of Zambia during a period of highest cattle–water contact

Contact Info

Product

Resources

About