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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
26/09/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
COSTA, C. A. F.; BRADLEY, R. E. |
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Afiliação: |
CARLOS ALBERTO FAGONDE COSTA, CNPC; RICHARD E. BRADLEY, Florida Agricultural Experiment Station. |
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Título: |
Hyperparasitism of intrasnail stages of Fasciola hepatica by a mosquito microsporidian parasite. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Journal of Invertebrate Pathology, v. 35, n. 2, p. 175-181, 1980. |
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DOI: |
10.1016/0022-2011(80)90180-9 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Microsporidia are being developed as biological control agents for pests and parasites; their host specificity has been considered a taxonomic indicator. For these reasons the infection pattern following ingestion of Nosema algerae microsporidia was studied in the snail (Lymnaea cubensis) infected with Fasciola hepatica. The experimental group (A) comprised 30 snails exposed to F. hepatica miracidia 21 days prior to exposure to N. algerae spores. Group B (20 snails) were exposed to N. algerae spores without exposure to the trematode miracidia. Group C (70 snails) were exposed to trematode miracidia but not to the microsporidian. Group D (50 snails) were exposed to neither infective agent. Of these groups only 8 snails in group A were found to harbour microsporidia-infected F. hepatica larvae when inspected (by tissue smear and Giemsa staining) 22 days after exposure to N. algerae. Of these 8, 5 had microsporidia in their tissues. The proportion of snails with microsporidia-infected F. hepatica larvae was 0 at 5 days after exposure to the microsporidian, 14% at day 15 and 63% at day 22. It is concluded that the microsporidia are transmitted to F. hepatica by host ingestion. This is the first case to be described of such transmission to F. hepatica of a microsporidian arthropod pathogen. The presence in snail tissues of microsporidia may be due to contamination during removal of the infected trematode larvae. It can be inferred that microsporidia must reside for a time in snail tissues since theydo not appear in F. hepatica until 15 days after exposure. In demonstrating the possibility of hyperparasitic infection of trematodos by arthropod microsporidia, the study raises doubts as to the value of host type in microsporidian taxonomy. M. J. Whitaker MenosAbstract: Microsporidia are being developed as biological control agents for pests and parasites; their host specificity has been considered a taxonomic indicator. For these reasons the infection pattern following ingestion of Nosema algerae microsporidia was studied in the snail (Lymnaea cubensis) infected with Fasciola hepatica. The experimental group (A) comprised 30 snails exposed to F. hepatica miracidia 21 days prior to exposure to N. algerae spores. Group B (20 snails) were exposed to N. algerae spores without exposure to the trematode miracidia. Group C (70 snails) were exposed to trematode miracidia but not to the microsporidian. Group D (50 snails) were exposed to neither infective agent. Of these groups only 8 snails in group A were found to harbour microsporidia-infected F. hepatica larvae when inspected (by tissue smear and Giemsa staining) 22 days after exposure to N. algerae. Of these 8, 5 had microsporidia in their tissues. The proportion of snails with microsporidia-infected F. hepatica larvae was 0 at 5 days after exposure to the microsporidian, 14% at day 15 and 63% at day 22. It is concluded that the microsporidia are transmitted to F. hepatica by host ingestion. This is the first case to be described of such transmission to F. hepatica of a microsporidian arthropod pathogen. The presence in snail tissues of microsporidia may be due to contamination during removal of the infected trematode larvae. It can be inferred that microsporidia must reside for a ti... Mostrar Tudo |
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Palavras-Chave: |
Eukaryota; Giemsa staining; Helminthoses; Lymnaea cubensis; Microspora; Snail-borne diseases. |
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Thesagro: |
Controle biológico; Fasciola hepatica; Helminto; Inimigo natural; Parasitologia; Platelminto; Protozoose; Trematódeo; Verminose. |
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Thesaurus Nal: |
Biological control agents; fascioliasis; Freshwater molluscs; Helminths; host specificity; Microsporidiosis; miracidia; Mollusca; Natural enemies; Nosema algerae; Parasitology; Parasitoses; Platyhelminthes; Protozoa; Protozoal infections; Snails; Taxonomy; Trematoda; Trematode infections. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
LEADER 03302naa a2200553 a 4500
001 1520254
005 2019-09-26
008 1980 bl uuuu u00u1 u #d
024 7 $a10.1016/0022-2011(80)90180-9$2DOI
100 1 $aCOSTA, C. A. F.
245 $aHyperparasitism of intrasnail stages of Fasciola hepatica by a mosquito microsporidian parasite.$h[electronic resource]
260 $c1980
520 $aAbstract: Microsporidia are being developed as biological control agents for pests and parasites; their host specificity has been considered a taxonomic indicator. For these reasons the infection pattern following ingestion of Nosema algerae microsporidia was studied in the snail (Lymnaea cubensis) infected with Fasciola hepatica. The experimental group (A) comprised 30 snails exposed to F. hepatica miracidia 21 days prior to exposure to N. algerae spores. Group B (20 snails) were exposed to N. algerae spores without exposure to the trematode miracidia. Group C (70 snails) were exposed to trematode miracidia but not to the microsporidian. Group D (50 snails) were exposed to neither infective agent. Of these groups only 8 snails in group A were found to harbour microsporidia-infected F. hepatica larvae when inspected (by tissue smear and Giemsa staining) 22 days after exposure to N. algerae. Of these 8, 5 had microsporidia in their tissues. The proportion of snails with microsporidia-infected F. hepatica larvae was 0 at 5 days after exposure to the microsporidian, 14% at day 15 and 63% at day 22. It is concluded that the microsporidia are transmitted to F. hepatica by host ingestion. This is the first case to be described of such transmission to F. hepatica of a microsporidian arthropod pathogen. The presence in snail tissues of microsporidia may be due to contamination during removal of the infected trematode larvae. It can be inferred that microsporidia must reside for a time in snail tissues since theydo not appear in F. hepatica until 15 days after exposure. In demonstrating the possibility of hyperparasitic infection of trematodos by arthropod microsporidia, the study raises doubts as to the value of host type in microsporidian taxonomy. M. J. Whitaker
650 $aBiological control agents
650 $afascioliasis
650 $aFreshwater molluscs
650 $aHelminths
650 $ahost specificity
650 $aMicrosporidiosis
650 $amiracidia
650 $aMollusca
650 $aNatural enemies
650 $aNosema algerae
650 $aParasitology
650 $aParasitoses
650 $aPlatyhelminthes
650 $aProtozoa
650 $aProtozoal infections
650 $aSnails
650 $aTaxonomy
650 $aTrematoda
650 $aTrematode infections
650 $aControle biológico
650 $aFasciola hepatica
650 $aHelminto
650 $aInimigo natural
650 $aParasitologia
650 $aPlatelminto
650 $aProtozoose
650 $aTrematódeo
650 $aVerminose
653 $aEukaryota
653 $aGiemsa staining
653 $aHelminthoses
653 $aLymnaea cubensis
653 $aMicrospora
653 $aSnail-borne diseases
700 1 $aBRADLEY, R. E.
773 $tJournal of Invertebrate Pathology$gv. 35, n. 2, p. 175-181, 1980.
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