Base de dados : MEDLINE
Pesquisa : B05.500.500.150 [Categoria DeCS]
Referências encontradas : 250 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 25 ir para página                         

  1 / 250 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
[PMID]:29405690
[Au] Autor:Shchenkov SV
[Ti] Título:[Description of virgulate Cercaria etgesh larva Nov. (Xiphidiocercariae): A new type of virgule organ].
[So] Source:Parazitologiia;51(2):158-64, 2017 Mar-Apr.
[Is] ISSN:0031-1847
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:A new species of virgulate cercaria is described. The morphology and chaetotaxy of cercariae are studied. The new type of virgule organ is described. Every description is illustrated by drawings.
[Mh] Termos MeSH primário: Estruturas Animais/anatomia & histologia
Cercárias/anatomia & histologia
Gastrópodes/parasitologia
Trematódeos/anatomia & histologia
[Mh] Termos MeSH secundário: Estruturas Animais/fisiologia
Animais
Cercárias/fisiologia
Rios/parasitologia
Federação Russa
Trematódeos/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE


  2 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28753630
[Au] Autor:Augusto RC; Tetreau G; Chan P; Walet-Balieu ML; Mello-Silva CC; Santos CP; Grunau C
[Ad] Endereço:Laboratório de Avaliação e Promoção da Saúde Ambiental, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Brasil.
[Ti] Título:Double impact: natural molluscicide for schistosomiasis vector control also impedes development of Schistosoma mansoni cercariae into adult parasites.
[So] Source:PLoS Negl Trop Dis;11(7):e0005789, 2017 Jul.
[Is] ISSN:1935-2735
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Schistosomiasis has been reported in 78 endemic countries and affects 240 million people worldwide. The digenetic parasite Schistosoma mansoni needs fresh water to compete its life cycle. There, it is susceptible to soluble compounds that can affect directly and/or indirectly the parasite's biology. The cercariae stage is one of the key points in which the parasite is vulnerable to different soluble compounds that can significantly alter the parasite's life cycle. Molluscicides are recommended by the World Health Organization for the control of schistosomiasis transmission and Euphorbia milii latex is effective against snails intermediate hosts. METHODOLOGY/PRINCIPAL FINDINGS: We used parasitological tools and electron microscopy to verify the effects of cercariae exposure to natural molluscicide (Euphorbia milii latex) on morphology, physiology and fitness of adult parasite worms. In order to generate insights into key metabolic pathways that lead to the observed phenotypes we used comparative transcriptomics and proteomics. CONCLUSIONS/SIGNIFICANCE: We describe here that the effect of latex on the adult is not due to direct toxicity but it triggers an early change in developmental trajectory and perturbs cell memory, mobility, energy metabolism and other key pathways. We conclude that latex has not only an effect on the vector but applies also long lasting schistosomastatic action. We believe that these results are of interest not only to parasitologists since it shows that natural compounds, presumably without side effects, can have an impact that occurred unexpectedly on developmental processes. Such collateral damage is in this case positive, since it impacts the true target of the treatment campaign. This type of treatment could also provide a rational for the control of other pests. Our results will contribute to enforce the use of E. milii latex in Brazil and other endemic countries as cheap alternative or complement to mass drug treatment with Praziquantel, the only available drug to cure the patients (without preventing re-infection).
[Mh] Termos MeSH primário: Cercárias/crescimento & desenvolvimento
Látex/administração & dosagem
Moluscocidas/administração & dosagem
Schistosoma mansoni/efeitos dos fármacos
Schistosoma mansoni/ultraestrutura
[Mh] Termos MeSH secundário: Animais
Biomphalaria/parasitologia
Brasil
Cercárias/efeitos dos fármacos
Feminino
Modelos Lineares
Fígado/patologia
Masculino
Camundongos
Microscopia Eletrônica
Carga Parasitária
Extratos Vegetais/administração & dosagem
Esquistossomose mansoni/parasitologia
Esquistossomose mansoni/prevenção & controle
Análise de Sequência de RNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Latex); 0 (Molluscacides); 0 (Plant Extracts)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170729
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pntd.0005789


  3 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28692692
[Au] Autor:Moendeg KJ; Angeles JMM; Nakao R; Leonardo LR; Fontanilla IKC; Goto Y; Kirinoki M; Villacorte EA; Rivera PT; Inoue N; Chigusa Y; Kawazu SI
[Ad] Endereço:National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan.
[Ti] Título:Geographic strain differentiation of Schistosoma japonicum in the Philippines using microsatellite markers.
[So] Source:PLoS Negl Trop Dis;11(7):e0005749, 2017 Jul.
[Is] ISSN:1935-2735
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Microsatellites have been found to be useful in determining genetic diversities of various medically-important parasites which can be used as basis for an effective disease management and control program. In Asia and Africa, the identification of different geographical strains of Schistosoma japonicum, S. haematobium and S. mansoni as determined through microsatellites could pave the way for a better understanding of the transmission epidemiology of the parasite. Thus, the present study aims to apply microsatellite markers in analyzing the populations of S. japonicum from different endemic areas in the Philippines for possible strain differentiation. METHODOLOGY/ PRINCIPAL FINDINGS: Experimental mice were infected using the cercariae of S. japonicum collected from infected Oncomelania hupensis quadrasi snails in seven endemic municipalities. Adult worms were harvested from infected mice after 45 days of infection and their DNA analyzed against ten previously characterized microsatellite loci. High genetic diversity was observed in areas with high endemicity. The degree of genetic differentiation of the parasite population between endemic areas varies. Geographical separation was considered as one of the factors accounting for the observed difference between populations. Two subgroups have been observed in one of the study sites, suggesting that co-infection with several genotypes of the parasite might be present in the population. Clustering analysis showed no particular spatial structuring between parasite populations from different endemic areas. This result could possibly suggest varying degrees of effects of the ongoing control programs and the existing gene flow in the populations, which might be attributed to migration and active movement of infected hosts from one endemic area to another. CONCLUSIONS/ SIGNIFICANCE: Based on the results of the study, it is reasonable to conclude that genetic diversity could be one possible criterion to assess the infection status in highly endemic areas. Genetic surveillance using microsatellites is therefore important to predict the ongoing gene flow and degree of genetic diversity, which indirectly reflects the success of the control program in schistosomiasis-endemic areas.
[Mh] Termos MeSH primário: Cercárias/isolamento & purificação
Repetições de Microssatélites
Schistosoma japonicum/classificação
Caramujos/parasitologia
[Mh] Termos MeSH secundário: Animais
Coinfecção/epidemiologia
Feminino
Variação Genética
Genótipo
Geografia
Seres Humanos
Masculino
Camundongos
Camundongos Endogâmicos BALB C
Filipinas
Schistosoma japonicum/genética
Schistosoma japonicum/isolamento & purificação
Esquistossomose Japônica/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170808
[Lr] Data última revisão:
170808
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170711
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pntd.0005749


  4 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo SciELO Brasil
[PMID]:28327815
[Au] Autor:Wan K; Wang P; Zhang L
[Ad] Endereço:Nanjing Medical University Affiliated Wuxi Second Hospital, Wuxi City, Jiangsu Province, China.
[Ti] Título:In vivo and in vitro activity of oil extract of garlic (Allium sativum Linnaeus) against Schistosoma japonicum cercariae.
[So] Source:Rev Soc Bras Med Trop;50(1):126-129, 2017 Jan-Feb.
[Is] ISSN:1678-9849
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION: : The activity of garlic oil extract against Schistosoma japonicum cercariae was evaluated. METHODS:: The in vitro and in vivo cercaricidal activities against S. japonicum larvae were determined. RESULTS:: Exposure to ≥ 10-6 (v/v) garlic emulsions for 30 min led to 100% cercariae mortality; pre-exposure treatment with ≥ 10-4 (v/v) garlic emulsions showed 100% preventive efficacy against S. japonicum infection, while pre-treatment with 10-5 and 10-6 (v/v) emulsions achieved 20%-40% preventive efficacy and 35.2%-63.6% worm burden reduction. CONCLUSIONS:: Garlic oil extract has activity against S. japonicum larvae and a promising preventive efficacy against S. japonicum infection.
[Mh] Termos MeSH primário: Cercárias/efeitos dos fármacos
Alho/química
Extratos Vegetais/farmacologia
Schistosoma japonicum/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Feminino
Camundongos
Testes de Sensibilidade Parasitária
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Extracts)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170503
[Lr] Data última revisão:
170503
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170323
[St] Status:MEDLINE


  5 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28242064
[Au] Autor:Dao HTT; Dermauw V; Gabriël S; Suwannatrai A; Tesana S; Nguyen GTT; Dorny P
[Ad] Endereço:National Institute of Veterinary Research, Hanoi, Viet Nam; Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium; Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
[Ti] Título:Opisthorchis viverrini infection in the snail and fish intermediate hosts in Central Vietnam.
[So] Source:Acta Trop;170:120-125, 2017 Jun.
[Is] ISSN:1873-6254
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Opisthorchis viverrini, a carcinogenic fish borne fluke, requires freshwater snails and fish as intermediate hosts. Opisthorchiasis is endemic in parts of Southeast Asia, including Central and South Vietnam. In this region the transmission by intermediate hosts has received little attention. Therefore, freshwater snails and wild fish from Bau My Tho, an opisthorchiasis endemic area in Binh Dinh Province were collected for examination of O. viverrini cercariae and metacercariae, respectively. A total of 12,000 snails belonging to six families, of which 1616 Bithynia snails representing Bithynia siamensis goniomphalos and Bithynia funiculata; as well as 754 fish representing 12 species were examined. Shedding of O. viverrini cercariae was observed only in B. s. goniomphalos and B. funiculata, at infection rates of 0.86% and 0.14%, respectively. O. viverrini infection in Bithynia spp. was significantly associated with the habitat but not with the species and the shell size of Bithynia spp. O. viverrini metacercariae were found in 10 fish species representing both Cyprinidae and non-Cyprinidae families. The prevalence of O. viverrini infection in fish was significantly associated with species. Carassius auratus, a fish species commonly eaten raw, Rasbora aurotaenia and Puntius brevis had the highest prevalence of 74.0%, 55.8% and 31.6%, respectively. Sharing of the same snail and fish intermediate host species was found for O. viverrini and a O. viverrini duck-genotype that are sympatric in the study region. This study is the first to report on the intermediate host species of O. viverrini in Central Vietnam and indicates a high risk of acquiring opistorchiasis when eating raw fish dishes.
[Mh] Termos MeSH primário: Cercárias/parasitologia
Peixes/parasitologia
Opistorquíase/veterinária
Caramujos/parasitologia
[Mh] Termos MeSH secundário: Animais
Genótipo
Opistorquíase/epidemiologia
Prevalência
Tailândia/epidemiologia
Vietnã/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170301
[St] Status:MEDLINE


  6 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28232043
[Au] Autor:Krupenko D; Gonchar A
[Ad] Endereço:Department of Invertebrate Zoology, Biological Faculty, Saint Petersburg State University, Universitetskaya emb., 7/9, 199034 St. Petersburg, Russia. Electronic address: midnightcrabb@gmail.com.
[Ti] Título:Musculature arrangement and locomotion in notocotylid cercariae (Digenea: Notocotylidae) from mud snail Ecrobia ventrosa (Montagu, 1803).
[So] Source:Parasitol Int;66(3):262-271, 2017 Jun.
[Is] ISSN:1873-0329
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Cercariae of digenean family Notocotylidae are characterized by a set of morphological traits which make them easily distinguishable from any other. One of the key features is absence of ventral sucker. This affects basic ways of locomotion and attachment. To understand how these functions are fulfilled we studied musculature arrangement in cercariae of two species by means of fluorescent-phalloidin staining and confocal microscopy. We used Cercaria Notocotylidae sp. No. 11 and 12 Deblock, 1980 from mud snails Ecrobia (=Hydrobia) ventrosa. Information on gross morphology (especially body-tail junction) and basic behavioural patterns of these cercariae is also updated. Major special features of musculature are associated with the ventral concavity: extreme development of dorsoventral muscle fibres and formation of annular arrangement of longitudinal muscle fibres on the ventral side. Additional body-wall and internal muscle bundles in the anterior region are also specific for notocotylid cercariae and seem to play important role in twisting movements during substratum testing. Musculature of dorsal adhesive pockets, oral sucker and tail is also described. These results are discussed in relation to observed locomotory patterns.
[Mh] Termos MeSH primário: Locomoção
Músculos/anatomia & histologia
Caramujos/parasitologia
Trematódeos/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Cercárias/anatomia & histologia
Cercárias/fisiologia
Cercárias/ultraestrutura
Microscopia Confocal
Músculos/fisiologia
Músculos/ultraestrutura
Solo/parasitologia
Trematódeos/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170225
[St] Status:MEDLINE


  7 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28160073
[Au] Autor:Wan C; Jin F; Du Y; Yang K; Yao L; Mei Z; Huang W
[Ad] Endereço:Department of Microbiology and Immunology, Medical College, China Three Gorges University, Yichang, Hubei, 443002, China.
[Ti] Título:Genistein improves schistosomiasis liver granuloma and fibrosis via dampening NF-kB signaling in mice.
[So] Source:Parasitol Res;116(4):1165-1174, 2017 Apr.
[Is] ISSN:1432-1955
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:In schistosomiasis, egg deposition in the liver contributes to the formation of hepatic granuloma and fibrosis, which are the most serious clinical pathological features. It has been proposed that activation of the nuclear factor kappa B (NF-κB) signaling pathways is closely associated with the development of hepatic granuloma and fibrosis. Genistein has been shown to inhibit the activity of NF-κB signaling pathways, which might be a potential agent to protect against Schistosoma japonicum egg-induced liver granuloma and fibrosis. In this study, liver granuloma and fibrosis were induced by infecting BALB/c mice with 18 ± 3 cercariae of S. japonicum. At the beginning of egg granuloma formation (early phase genistein treatment from 4 to 6 weeks after infection) or after the formation of liver fibrosis (late phase genistein treatment from 6 to 10 weeks after infection), the infected mice were injected with genistein (25, 50 mg/kg). The results revealed that genistein treatment significantly decreased the extent of hepatic granuloma and fibrosis in infected mice. The activity of NF-κB signaling declined sharply after the treatment with genistein, as evidenced by the inhibition of NF-κB-p65, phospho-NF-κB-p65, and phospo-IκB-α expressions, as well as the expression of IκB-α and the messenger RNA (mRNA) expression of inflammatory cytokines (MCP1, TNFα, IL1ß, IL4, IL10) mediated by NF-κB signaling pathways in the early phase of the infection. Moreover, western blot and immunohistochemistry assays demonstrated that the contents of α-smooth muscle actin (α-SMA) and transforming growth factor-ß were dramatically reduced in liver tissue under the treatment of genistein in the late phase of the infection. At the same time, the mRNA expression of MCP1, TNFα, and IL10 was inhibited markedly. These results provided evidence that genistein reduces S. japonicum egg-induced liver granuloma and fibrosis, at least partly due to decreased NF-κB signaling, and subsequently decreased MCP1, TNFα, and IL10 expressions. This implies that genistein can be a potential natural agent against schistosomiasis.
[Mh] Termos MeSH primário: Antiprotozoários/uso terapêutico
Genisteína/uso terapêutico
Granuloma/tratamento farmacológico
Quinase I-kappa B/antagonistas & inibidores
Cirrose Hepática/tratamento farmacológico
Schistosoma japonicum/efeitos dos fármacos
Esquistossomose Japônica/tratamento farmacológico
Transdução de Sinais/efeitos dos fármacos
Fator de Transcrição RelA/antagonistas & inibidores
[Mh] Termos MeSH secundário: Animais
Cercárias/metabolismo
Quimiocina CCL2/biossíntese
Quimiocina CCL2/genética
Ativação Enzimática
Granuloma/parasitologia
Granuloma/patologia
Interleucina-10/biossíntese
Interleucina-10/genética
Fígado/parasitologia
Fígado/patologia
Cirrose Hepática/parasitologia
Cirrose Hepática/patologia
Masculino
Camundongos
Camundongos Endogâmicos BALB C
RNA Mensageiro/metabolismo
Schistosoma japonicum/genética
Esquistossomose Japônica/parasitologia
Fator de Necrose Tumoral alfa/biossíntese
Fator de Necrose Tumoral alfa/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antiprotozoal Agents); 0 (Ccl2 protein, mouse); 0 (Chemokine CCL2); 0 (IL10 protein, mouse); 0 (RNA, Messenger); 0 (Rela protein, mouse); 0 (Transcription Factor RelA); 0 (Tumor Necrosis Factor-alpha); 130068-27-8 (Interleukin-10); DH2M523P0H (Genistein); EC 2.7.11.10 (Chuk protein, mouse); EC 2.7.11.10 (I-kappa B Kinase)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171007
[Lr] Data última revisão:
171007
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170205
[St] Status:MEDLINE
[do] DOI:10.1007/s00436-017-5392-3


  8 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28131768
[Au] Autor:Nakao M; Waki T; Sasaki M; Anders JL; Koga D; Asakawa M
[Ad] Endereço:Department of Parasitology, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan. Electronic address: nakao@asahikawa-med.ac.jp.
[Ti] Título:Brachylaima ezohelicis sp. nov. (Trematoda: Brachylaimidae) found from the land snail Ezohelix gainesi, with a note of an unidentified Brachylaima species in Hokkaido, Japan.
[So] Source:Parasitol Int;66(3):240-249, 2017 Jun.
[Is] ISSN:1873-0329
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In the Japanese Archipelago, Ezohelix gainesi, a member of bradybaenid land snails, is endemic mainly to the island of Hokkaido. During July to August of 2016, a survey to detect trematode infections from E. gainesi was carried out at a forest city park in Asahikawa, Hokkaido. Systemic infections of the snails with sporocysts containing short-tailed cercariae were found in 5.3% of 94 individuals examined. Furthermore, most of them (90.4%) harbored non-encysted metacercariae within their kidneys. A DNA sequence identification revealed that both of the sporocyst and the metacercaria belong to an unknown species of the family Brachylaimidae. The metacercariae showed a genetic diversity with 6 haplotypes of mitochondrial DNA (mtDNA) even in the limited sampling area. A definitive host of the unknown species could not be determined, although 34 field mice (Apodemus speciosus) and 21 voles (Myodes rufocanus) from the city park were examined for intestinal parasites. To examine the adult stage, the metacercariae were perorally administrated to mice, together with anti-inflammatory treatment with methylprednisolone. Fully matured adult worms were recovered from the intestinal ileum 8 and 14days postinfection. The gravid adults showed typical features of the genus Brachylaima. A morphological and biogeographical evaluation prompted us to propose Brachylaima ezohelicis sp. nov. for the parasite from E. gainesi. The autochthony of the first intermediate host and the spatial heterogeneity of mtDNA suggest that the new species found in the city park is not a recently expanded population of immigrant origin.
[Mh] Termos MeSH primário: Caramujos/parasitologia
Trematódeos/classificação
Trematódeos/isolamento & purificação
[Mh] Termos MeSH secundário: Adulto
Animais
Cercárias/genética
Cercárias/fisiologia
DNA Mitocondrial/genética
Seres Humanos
Enteropatias Parasitárias/parasitologia
Enteropatias Parasitárias/veterinária
Japão/epidemiologia
Camundongos
Murinae/parasitologia
Oocistos
Parques Recreativos
Ratos
Doenças dos Roedores/parasitologia
Solo/parasitologia
Trematódeos/genética
Infecções por Trematódeos/parasitologia
Infecções por Trematódeos/veterinária
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Mitochondrial); 0 (Soil)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170130
[St] Status:MEDLINE


  9 / 250 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28117302
[Au] Autor:O'Leary PA; Pung OJ
[Ad] Endereço:Department of Biology, Georgia Southern University, Statesboro, Georgia 30458, USA.
[Ti] Título:Behavioral analysis of Microphallus turgidus cercariae in relation to microhabitat of two host grass shrimp species (Palaemonetes spp.).
[So] Source:Dis Aquat Organ;122(3):237-245, 2017 01 24.
[Is] ISSN:0177-5103
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The behavior of Microphallus turgidus cercariae was examined and compared to microhabitat selection of the second intermediate hosts of the parasite, Palaemonetes spp. grass shrimp. Cercariae were tested for photokinetic and geotactic responses, and a behavioral ethogram was established for cercariae in control and grass shrimp-conditioned brackish water. Photokinesis trials were performed using a half-covered Petri dish, and geotaxis trials used a graduated cylinder. Both photokinesis and geotaxis trials were performed in lighted and unlighted conditions. In 9 of 10 photokinesis experiments, over half of the cercariae swam horizontally under the covered half of a Petri dish in both the lighted and the unlighted trials. However, movement of the cercariae to the covered half of the dish was highest (81.4%) when the parasites were exposed to light. In the geotaxis study, most cercariae were found in the bottom third of a graduated cylinder water column in both the lighted and unlighted trials. The most frequently observed activity of individual cercariae in a lighted Petri dish was swimming on the bottom of the dish. Activity patterns of the cercariae were not affected by shrimp-conditioned water. Movement of the cercariae away from light into dark, active swimming at or near the bottom of the water column, and a lack of response to host odors suggest that the cercariae utilize search patterns that place the parasite in the preferred microhabitat of the principle second intermediate host, the grass shrimp P. pugio.
[Mh] Termos MeSH primário: Cercárias/fisiologia
Palaemonidae/parasitologia
Trematódeos/fisiologia
[Mh] Termos MeSH secundário: Animais
Interações Hospedeiro-Parasita
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170615
[Lr] Data última revisão:
170615
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170125
[St] Status:MEDLINE
[do] DOI:10.3354/dao03075


  10 / 250 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28115664
[Au] Autor:Kariuki HC; Ivy JA; Muchiri EM; Sutherland LJ; King CH
[Ad] Endereço:Division of Vector Borne Diseases, Ministry of Health, Nairobi, Kenya.
[Ti] Título:Divergent Effects of Exposure on Intermediate-Host Snail Species and from Coastal Kenya.
[So] Source:Am J Trop Med Hyg;96(4):850-855, 2017 Apr.
[Is] ISSN:1476-1645
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Abstract infection causes urogenital schistosomiasis, a chronic inflammatory disease that is highly prevalent in many parts of sub-Saharan Africa. Bulinid snails are the obligate intermediate hosts in the transmission of this parasite. In the present study, and snails from coastal Kenya were raised in the laboratory and exposed to miracidia derived from sympatric specimens to assess the species-specific impact of parasite contact and infection. The snails' subsequent patterns of survival, cercarial shedding, and reproduction were monitored for up to 3 months postexposure. exposure significantly decreased the survival of , but not of . Although both species were capable of transmitting , the study population had a greater cumulative incidence of cercarial shedders and a higher average number of cercariae shed per snail than did the population. The effects of prior parasite exposure on snail reproduction were different between the two species. These included more numerous production of egg masses by exposed (as compared with unexposed snails), contrasted to decreased overall egg mass production by parasite-exposed . The interspecies differences in the response to and transmission of reflect clear differences in life histories for the two bulinid species when they interact with the parasite, which should be taken into account when planning control interventions aimed at reducing each host snails' contribution to local transmission of infection.
[Mh] Termos MeSH primário: Bulinus/parasitologia
Schistosoma haematobium/fisiologia
[Mh] Termos MeSH secundário: Animais
Cercárias
Interações Hospedeiro-Parasita
Quênia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170731
[Lr] Data última revisão:
170731
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170125
[St] Status:MEDLINE
[do] DOI:10.4269/ajtmh.16-0614



página 1 de 25 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde