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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
23/04/1999 |
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Data da última atualização: |
23/04/1999 |
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Autoria: |
COSTA, C. A. F. |
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Título: |
Infection of Fasciola hepatica (Digenea: Fasciolidae) with Nosema algerae (Microsporida: Nosematidae) during development in Lymnaea cubensis (Basommatophora: Lymnaeidae). |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Florida: University of Florida, 1978. |
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Páginas: |
96p. |
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Idioma: |
Inglês |
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Notas: |
Tese Mestrado. |
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Conteúdo: |
The susceptibility of Lymnaea cubensis (a natural vector of Fasciola hepatica) and F. hepatica larvae to infection with Nosema algerae, a microsporidian pathogen of mosquitoes was investigated. Possible influences of prior F. hepatica infection on the snail susceptibility to N. algerae were also studied. A method for laboratory colonization of L. cubensis was developed and evaluated, based on snail mortality and metacercariae production after F. hepatica infection. The infectivity of F. hepatica miracidia, from a common source, to L. cubensis snails from 2 different regions of Florida (Palatka and Clewiston) was established. The snail mortality recorded during a 50-day period was 10% and metacercariae production in snails with 50-day old F. hepatica infections averaged 31.6 metacercariae per snail. The infectivity of F. hepatica miracidia to snails from the Palatka and Clewiston areas was significantly (p<0.01) different with the snails from Palatka more susceptible. In the infectivity studies of N. algerae to L. cubensis that were infected with F. hepatica larvae, 38% were found to harbor F. hepatica larvae with microsporidian infections. However, in the snails with infected trematode larvae only about 60% had microsporidian stages in their tissues. It could not be established if these represented true infections or had been released from the larvae during dissection. Control snail groups, not exposed to N. algerae spores, but either infected or non-infected with F. hepatica, did not show microsporidia infrections when dissected. The percentage of snails harboring microsporidia- infected F. hepatica larvae increased as the interval between exposure to N. algerae and examination for infection also increased. During the time of dissection, most microsporidian infections were light and could not be associated with pathological changes in the infected trematode rediae. The life cycle of the microsporidium was determined and compared with that of N. algerae and other microsporidia previously reported in the snail-trematode system. Based on incidence and morphological findings, the successful transmisson of N. algerae, a mosquito pathogen, to F. hepatica rediae in L. cubensis was accomplished. This is the first report of a microsporidium from arthropods hyperparasitizing trematode larvae in snails. MenosThe susceptibility of Lymnaea cubensis (a natural vector of Fasciola hepatica) and F. hepatica larvae to infection with Nosema algerae, a microsporidian pathogen of mosquitoes was investigated. Possible influences of prior F. hepatica infection on the snail susceptibility to N. algerae were also studied. A method for laboratory colonization of L. cubensis was developed and evaluated, based on snail mortality and metacercariae production after F. hepatica infection. The infectivity of F. hepatica miracidia, from a common source, to L. cubensis snails from 2 different regions of Florida (Palatka and Clewiston) was established. The snail mortality recorded during a 50-day period was 10% and metacercariae production in snails with 50-day old F. hepatica infections averaged 31.6 metacercariae per snail. The infectivity of F. hepatica miracidia to snails from the Palatka and Clewiston areas was significantly (p<0.01) different with the snails from Palatka more susceptible. In the infectivity studies of N. algerae to L. cubensis that were infected with F. hepatica larvae, 38% were found to harbor F. hepatica larvae with microsporidian infections. However, in the snails with infected trematode larvae only about 60% had microsporidian stages in their tissues. It could not be established if these represented true infections or had been released from the larvae during dissection. Control snail groups, not exposed to N. algerae spores, but either infected or non-infected with F. hepatic... Mostrar Tudo |
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Palavras-Chave: |
Lymnaea cubensis. |
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Thesagro: |
Fascíola Hepática; Parasito; Trematódeo. |
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Thesaurus Nal: |
Nosema algerae; parasites; Trematoda. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03004nam a2200217 a 4500
001 1563297
005 1999-04-23
008 1978 bl uuuu m 00u1 u #d
100 1 $aCOSTA, C. A. F.
245 $aInfection of Fasciola hepatica (Digenea$bFasciolidae) with Nosema algerae (Microsporida: Nosematidae) during development in Lymnaea cubensis (Basommatophora: Lymnaeidae).
260 $aFlorida: University of Florida$c1978
300 $a96p.
500 $aTese Mestrado.
520 $aThe susceptibility of Lymnaea cubensis (a natural vector of Fasciola hepatica) and F. hepatica larvae to infection with Nosema algerae, a microsporidian pathogen of mosquitoes was investigated. Possible influences of prior F. hepatica infection on the snail susceptibility to N. algerae were also studied. A method for laboratory colonization of L. cubensis was developed and evaluated, based on snail mortality and metacercariae production after F. hepatica infection. The infectivity of F. hepatica miracidia, from a common source, to L. cubensis snails from 2 different regions of Florida (Palatka and Clewiston) was established. The snail mortality recorded during a 50-day period was 10% and metacercariae production in snails with 50-day old F. hepatica infections averaged 31.6 metacercariae per snail. The infectivity of F. hepatica miracidia to snails from the Palatka and Clewiston areas was significantly (p<0.01) different with the snails from Palatka more susceptible. In the infectivity studies of N. algerae to L. cubensis that were infected with F. hepatica larvae, 38% were found to harbor F. hepatica larvae with microsporidian infections. However, in the snails with infected trematode larvae only about 60% had microsporidian stages in their tissues. It could not be established if these represented true infections or had been released from the larvae during dissection. Control snail groups, not exposed to N. algerae spores, but either infected or non-infected with F. hepatica, did not show microsporidia infrections when dissected. The percentage of snails harboring microsporidia- infected F. hepatica larvae increased as the interval between exposure to N. algerae and examination for infection also increased. During the time of dissection, most microsporidian infections were light and could not be associated with pathological changes in the infected trematode rediae. The life cycle of the microsporidium was determined and compared with that of N. algerae and other microsporidia previously reported in the snail-trematode system. Based on incidence and morphological findings, the successful transmisson of N. algerae, a mosquito pathogen, to F. hepatica rediae in L. cubensis was accomplished. This is the first report of a microsporidium from arthropods hyperparasitizing trematode larvae in snails.
650 $aNosema algerae
650 $aparasites
650 $aTrematoda
650 $aFascíola Hepática
650 $aParasito
650 $aTrematódeo
653 $aLymnaea cubensis
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 51 | |
| 19. |  | VIEIRA, L. da S.; GONÇALVES, P. C.; COSTA, C. A. F.; BERNE, M. E. A. Atividade in Vitro dos Benzimidazóis: Oxfendazole, Fenbendazole, Albendazole e Thiabendazole em Nematódeos Gastrintestinais de Caprinos. Pesquisa Agropecuária Brasileira, Brasília, v.24, n.10, p. 1201-1209, out. 1989| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Caprinos e Ovinos; Embrapa Unidades Centrais. |
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| 20. | | VIEIRA, L. da S.; GONCALVES, P. C.; COSTA, C. A. F.; BERNE, M. E. A. Atividade ovicida "in vitro" dos benzimidazóis: oxfendazole, fenbendazole, albendazole e thiabendazole em nematódeos gastrintestinais de caprinos. In: SEMINÁRIO DO COLÉGIO BRASILEIRO DE PARASITOLOGIA VETERINÁRIA, 5., 1987, Belo Horizonte. Resumos... Belo Horizonte: Colégio Brasileiro de Parasitologia Veterinária, 1987. p. 17.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| Registros recuperados : 51 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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