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[PMID]:28536880
[Au] Autor:Dibaba MD; Getachew AM; Assefa Z; Fanta A; Etana M; Firew S; Goshu L; Burden F
[Ad] Endereço:College of Veterinary Medicine and Agriculture, Addis Ababa University, Addis Ababa, Ethiopia.
[Ti] Título:Seasonal variation of strongylosis in working donkeys of Ethiopia: a cross-sectional and longitudinal studies.
[So] Source:Parasitol Res;116(7):2009-2015, 2017 Jul.
[Is] ISSN:1432-1955
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Helminths are one of the major health problems of working donkeys, often with heavy worm burden and contributing to their early demise and/or reduction in their work output. Cross-sectional and longitudinal studies were conducted to investigate the current infection prevalence and level of strongyles infection donkeys would acquire through different seasons in the mid-lowland agro-ecological zones of Ethiopia. For this purpose, faecal samples from 206 (cross-sectional study) and 102 (longitudinal study) randomly selected donkeys were directly collected from the rectum and analysed. For the longitudinal study, the 102 donkeys dewormed at the end of main rainy season, beginning of October, were monitored for the level of strongyle infection they would acquire during subsequent dry and short rainy seasons. The cross-sectional study of 206 donkey has revealed an overall infection prevalence of 89.3% (95% confidence interval (CI) = 84.4, 92.9). Donkeys in the lowland zone showed a significantly higher strongyle infection prevalence (P = 0.0126) and mean eggs per gramme of faces (EPG) (P = 0.001; 2775 EPG) compared to donkeys in the midland zone (980.8 EPG). Age, sex and body condition did not have any significant effect on either the infection prevalence or level of infection (P > 0.05). The longitudinal study has shown a significantly lower strongyle infection prevalence (P = 0.003) and level of infection donkeys acquired (P = 0.001) in the subsequent dry and short rainy seasons compared to the main rainy season following October deworming. However, these values were not significantly different between the two agro-ecological zones (P > 0.05). This study clearly showed that parasitic infections are primarily acquired during the main rainy season when pasture/herbage coverage is relatively better, and the environment is conducive for parasites survival and development. On the other hand, the finding of majority of donkeys shedding low or no eggs during the dry and short rainy seasons showed that October deworming was effective, and donkeys acquire low or no parasitic infection during the subsequent dry and short rainy seasons. Therefore, the practice of anthelmintic treatment of donkeys at the end of short rain in May may not be necessary, and October deworming once a year is sufficient.
[Mh] Termos MeSH primário: Equidae
Infecções por Strongylida/veterinária
Estrongilídios
[Mh] Termos MeSH secundário: Animais
Estudos Transversais
Etiópia/epidemiologia
Fezes/parasitologia
Feminino
Estudos Longitudinais
Masculino
Prevalência
Chuvas
Estações do Ano
Infecções por Strongylida/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171101
[Lr] Data última revisão:
171101
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170525
[St] Status:MEDLINE
[do] DOI:10.1007/s00436-017-5485-z


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[PMID]:27888660
[Au] Autor:Xu Y; Zarrin-Khameh N
[Ad] Endereço:Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas.
[Ti] Título:Strongyloides in cerebrospinal fluid.
[So] Source:Diagn Cytopathol;45(2):125-127, 2017 Feb.
[Is] ISSN:1097-0339
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Infecções Oportunistas Relacionadas com a AIDS/líquido cefalorraquidiano
Infecções por Strongylida/líquido cefalorraquidiano
[Mh] Termos MeSH secundário: Animais
Líquido Cefalorraquidiano/parasitologia
Seres Humanos
Masculino
Meia-Idade
Estrongilídios/isolamento & purificação
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170209
[Lr] Data última revisão:
170209
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161127
[St] Status:MEDLINE
[do] DOI:10.1002/dc.23648


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[PMID]:27188582
[Au] Autor:Liu W; Wang T; Liu TB; Tan L; Lv CC; Liu Y
[Ad] Endereço:College of Veterinary Medicine,Hunan Agricultural University,410128 Changsha,Hunan Province,P.R. China.
[Ti] Título:The occurrence of the strongylid nematodes Kalicephalus brachycephalus, K. bungari and K. indicus in snake species from Hunan Province, China.
[So] Source:J Helminthol;91(3):384-386, 2017 May.
[Is] ISSN:1475-2697
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Kalicephalus is a genus of strongylid nematodes infecting snakes and causing serious diseases and even death when it is complicated with secondary bacterial infections. The infection of snakes with Kalicephalus has been reported in many countries in the world. However, little information is available on the prevalence of Kalicephalus in snakes in China. In the present study, the prevalence of Kalicephalus in snakes was investigated. The worms were examined, counted and identified to species according to existing keys and descriptions. Three species of Kalicephalus, namely K. indicus, K. bungari and K. brachycephalus, were found in six species of snakes (Elaphe carinata, Zaocys dhumnade, Naja najaatra, Elaphe taeniura, Bungarus multicinctus and Dinodon rufozonatum). The total prevalence of Kalicephalus in snakes in Hunan Province was 39.7%. The most common species was K. indicus, with the highest prevalence 72.8%, followed by K. bungari (24.0%). The prevalence of K. brachycephalus was 0.9%. This is the first report on the prevalence of Kalicephalus species in snakes in China, and the findings have important implications for the control of Kalicephalus infections in snakes in China.
[Mh] Termos MeSH primário: Serpentes/parasitologia
Infecções por Strongylida/veterinária
Estrongilídios/isolamento & purificação
[Mh] Termos MeSH secundário: Animais
China/epidemiologia
Prevalência
Estrongilídios/classificação
Infecções por Strongylida/epidemiologia
Infecções por Strongylida/parasitologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170407
[Lr] Data última revisão:
170407
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160519
[St] Status:MEDLINE
[do] DOI:10.1017/S0022149X16000274


  4 / 227 MEDLINE  
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[PMID]:27159713
[Au] Autor:Duan H; Gao JF; Su X; Fu X; Yue DM; Gao Y; Qiu JH; Wang CR
[Ad] Endereço:a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China.
[Ti] Título:Genetic variation between and within Triodontophorus brevicauda and Triodontophorus nipponicus revealed by analyses of mtDNA and rDNA gene sequences.
[So] Source:Mitochondrial DNA A DNA Mapp Seq Anal;28(4):570-574, 2017 Jul.
[Is] ISSN:2470-1408
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Triodontophorus spp. parasitizes the large intestine of equine, causing strongylid diseases. The present study assessed genetic variation in five gene regions within and between Triodontophorus brevicauda and Triodontophorus nipponicus from Heilongjiang Province and the Inner Mongolia Autonomous region. The five gene markers were three mitochondrial (mt) genes, cytochrome c oxidase subunit I (cox1), NADH dehydrogenase subunit 5 (nad5), cytochrome b (cytb); and two ribosomal RNA genes, the internal transcribed spacer 1 (ITS1) and the internal transcribed spacer 2 (ITS2). Partial (p) sequences of cox1, nad5, cytb and the complete ITS rDNA region were PCR amplified from individual nematodes, and the amplicons were subjected to sequencing in both directions. The size of the three mt genes is identical in both species: 761 bp (p cox1), 505 bp (pnad5) and 562 bp (pcytb); the length of the two ribosomal genes is different: 376 bp and 370 bp (ITS1), and 333 bp and 322 bp (ITS2), respectively. Intraspecific variation between T. brevicauda and T. nipponicus was 0-1.5% and 0-1.1% for pcox1, 0-2.0% and 0-2.0% for pnad5, 0-1.4% and 0-2.2% for pcytb, 0-0.8% and 0-1.1% for ITS1 and 0-0.9% and 0-2.2% for ITS2. Interspecific variation within the nematodes was 13.5-14.3% for pcox1, 15.5-18.7% for pnad5, 16.7-18.6% for pcytb, 11.5-13.1% for ITS1 and 16.0-18.4% for ITS2. Phylogenetic analyses based on the combined mt gene sequences, as well as with the ITS sequences, show each species forming a monophyletic group of individuals. However, samples of different species from the same geographical origin did not always cluster together. These results provide valuable information for further studies of systematics and population genetics of the genus Triodontophorus.
[Mh] Termos MeSH primário: DNA Mitocondrial/genética
DNA Ribossômico/genética
Análise de Sequência de DNA/métodos
Estrongilídios/classificação
[Mh] Termos MeSH secundário: Animais
Citocromos b/genética
DNA de Helmintos/genética
Complexo IV da Cadeia de Transporte de Elétrons/genética
Evolução Molecular
Variação Genética
NADH Desidrogenase/genética
Filogenia
Estrongilídios/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Helminth); 0 (DNA, Mitochondrial); 0 (DNA, Ribosomal); 9035-37-4 (Cytochromes b); EC 1.6.99.3 (NADH Dehydrogenase); EC 1.9.3.1 (Electron Transport Complex IV)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170914
[Lr] Data última revisão:
170914
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160510
[St] Status:MEDLINE
[do] DOI:10.3109/24701394.2016.1157867


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[PMID]:27018914
[Au] Autor:Kuchboev AE; Krücken J; Karimova RR; Ruziev BH; Pazilov A
[Ad] Endereço:Institute of the Gene Pool of Plants and Animals of Uzbekistan Academy of Sciences,Bogishamol str. 232,100053,Tashkent,Uzbekistan.
[Ti] Título:Infection levels of protostrongylid nematodes in definitive caprine and intermediate gastropod hosts from Uzbekistan.
[So] Source:J Helminthol;91(2):236-243, 2017 Mar.
[Is] ISSN:1475-2697
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Morphological analysis of lungworms collected among Caprinae from Uzbekistan resulted in the identification of four species of Protostrongylidae: Protostrongylus rufescens, Protostrongylus hobmaieri, Spiculocaulus leuckarti and Cystocaulus ocreatus. The following species were recorded as definitive hosts: Ovis aries, Ovis ammon, Ovis vignei, Capra hircus, Capra falconeri and Capra sibirica. The prevalence of P. rufescens reached 45.3%, followed by S. leuckarti and C. ocreatus with 31.7% and P. hobmaieri with 16.9%. The sex ratio ranged between 1:3.1 and 1:6.2, with P. hobmaieri showing the strongest predominance of females over males. The prevalence of infection of small ruminants with protostrongylid nematodes increased with the age of the hosts. Protostrongyles use terrestrial gastropods as intermediate hosts, and infective larvae were found in the species Vallonia costata, Gibbulinopsis signata, Pupilla muscorum, Pseudonapaeus albiplicata, Pseudonapaeus sogdiana, Leucozonella ferghanica, Xeropicta candacharica, Candaharia levanderi and Macrochlamys sogdiana. Xeropicta candacharica was the most abundant gastropod and had the highest prevalence of infection with protostrongylids. Adult X. candacharica had a significantly higher infection intensity than juveniles. The epidemiology of protostrongylid infections is dynamic and subject to considerable changes. Further characterization of the interaction of protostrongylid parasites with their terrestrial gastropods as intermediate hosts and Caprinae as definitive hosts is required to understand these processes and to monitor the effects of changing ecological contexts.
[Mh] Termos MeSH primário: Reservatórios de Doenças/parasitologia
Gastrópodes/parasitologia
Doenças das Cabras/parasitologia
Doenças dos Ovinos/parasitologia
Infecções por Strongylida/veterinária
Estrongilídios/fisiologia
[Mh] Termos MeSH secundário: Animais
Reservatórios de Doenças/veterinária
Vetores de Doenças
Feminino
Doenças das Cabras/transmissão
Cabras
Masculino
Ovinos
Doenças dos Ovinos/transmissão
Estrongilídios/genética
Estrongilídios/isolamento & purificação
Infecções por Strongylida/parasitologia
Infecções por Strongylida/transmissão
Uzbequistão
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170314
[Lr] Data última revisão:
170314
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160329
[St] Status:MEDLINE
[do] DOI:10.1017/S0022149X16000171


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[PMID]:27692327
[Au] Autor:Peachey LE; Pinchbeck GL; Matthews JB; Burden FA; Behnke JM; Hodgkinson JE
[Ad] Endereço:The Institute of Infection and Global Health, The University of Liverpool, UK. Electronic address: peachey14@hotmail.com.
[Ti] Título:Papaya latex supernatant has a potent effect on the free-living stages of equid cyathostomins in vitro.
[So] Source:Vet Parasitol;228:23-29, 2016 Sep 15.
[Is] ISSN:1873-2550
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The control of equid gastrointestinal nematodes in developed countries, in particular the cyathostomins, is threatened by high levels of anthelmintic resistance. In recent years, there has been increasing interest in the evaluation of traditional 'ethnoveterinary' medicines as alternatives to chemical anthelmintics. The cysteine proteinases (CPs), a group of enzymes derived from fruits such as papaya (Carica papaya), pineapple (Ananas comosus) and figs (Ficus spp.), have shown good efficacy against adult stages of a range of parasitic nematodes, in vitro and in vivo. The efficacy of CPs against cyathostomins remains to be explored. In this study, the efficacy of a crude preparation of CPs, papaya latex supernatant (PLS), against the free-living stages of cyathostomins was evaluated using two in vitro tests, the egg hatch test (EHT) and the larval migration inhibition test (LMIT). It was demonstrated that PLS had a potent effect in the EHT, with EC-50 values in the range of 0.12-0.22µM. At concentrations above 6.25µM the eggs did not develop, below this concentration the L1 developed but they lost integrity of the cuticle upon hatching. These effects were inhibited by pre-incubation of PLS with the CP inhibitor L-trans-epoxysuccinyl-l-leucylamido-(4-guanidino butane) (E64), indicating that CPs were responsible for the anti-parasitic activity. A dose-dependent inhibition of migration of third stage larvae (L3) in the LMIT was demonstrated at higher concentrations of PLS, with EC-50 values in the range of 67.35-106.31µM. Incubation of PLS with E64 prior to use in the LMIT did not reverse the anti-migratory effect, suggesting that CPs were not responsible for the reduced migration of cyathostomin L3 and that PLS also contains an additional active compound. This is the first report of PLS and/or CPs showing activity against the free-living stages of a parasitic helminth. In addition, it suggests that cyathostomins are highly sensitive to the effects of CPs and further evaluation of their efficacy against parasitic stages and in vivo are strongly indicated.
[Mh] Termos MeSH primário: Anti-Helmínticos/farmacologia
Carica/química
Inibidores de Cisteína Proteinase/farmacologia
Látex/farmacologia
Extratos Vegetais/farmacologia
Estrongilídios/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Cisteína Proteases/metabolismo
Larva/efeitos dos fármacos
Larva/crescimento & desenvolvimento
Estrongilídios/crescimento & desenvolvimento
Infecções por Strongylida/tratamento farmacológico
Infecções por Strongylida/parasitologia
Infecções por Strongylida/veterinária
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anthelmintics); 0 (Cysteine Proteinase Inhibitors); 0 (Latex); 0 (Plant Extracts); EC 3.4.- (Cysteine Proteases)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170807
[Lr] Data última revisão:
170807
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161004
[St] Status:MEDLINE


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[PMID]:27692315
[Au] Autor:Nisbet AJ; McNeilly TN; Greer AW; Bartley Y; Oliver EM; Smith S; Palarea-Albaladejo J; Matthews JB
[Ad] Endereço:Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, Midlothian EH26 0PZ, United Kingdom. Electronic address: Alasdair.Nisbet@moredun.ac.uk.
[Ti] Título:Protection of ewes against Teladorsagia circumcincta infection in the periparturient period by vaccination with recombinant antigens.
[So] Source:Vet Parasitol;228:130-136, 2016 Sep 15.
[Is] ISSN:1873-2550
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Teladorsagiosis is a major production-limiting disease in ruminants in temperate regions throughout the world and one of the key interventions in the management of the disease is the prevention of pasture contamination with Teladorsagia circumcincta eggs by ewes during the periparturient relaxation in immunity which occurs in the period around lambing. Here, we describe the immunisation of twin-bearing ewes with a T. circumcincta recombinant subunit vaccine and the impact that vaccination has on their immune responses and shedding of parasite eggs during a continuous T. circumcincta challenge period spanning late gestation and lactation. In ewes which displayed a clear periparturient relaxation in immunity, vaccination resulted in a 45% reduction in mean cumulative faecal egg count (cFEC, p=0.027) compared to control (immunised with adjuvant only) ewes. Recombinant antigen-specific IgG and IgA, which bound each of the vaccine antigens, were detected in the serum of vaccinated ewes following each immunisation and in colostrum taken from vaccinated ewes post-partum whereas low levels of antigen-specific IgG were detected in serum and colostrum from control ewes. Antigen-specific IgG and IgA levels in blood collected within 48h of birth from lambs largely reflected those in the colostrum of their ewes.
[Mh] Termos MeSH primário: Doenças dos Ovinos/prevenção & controle
Infecções por Strongylida/veterinária
Estrongilídios/imunologia
Vacinação/veterinária
[Mh] Termos MeSH secundário: Animais
Fezes/parasitologia
Feminino
Lactação/imunologia
Contagem de Ovos de Parasitas/veterinária
Ovinos
Doenças dos Ovinos/parasitologia
Infecções por Strongylida/parasitologia
Infecções por Strongylida/prevenção & controle
Vacinas Sintéticas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Vaccines, Synthetic)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170807
[Lr] Data última revisão:
170807
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161004
[St] Status:MEDLINE


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[PMID]:27638730
[Au] Autor:Chilton NB; Huby-Chilton F; Gasser RB; Koehler AV; Beveridge I
[Ad] Endereço:Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada.
[Ti] Título:Pharyngostrongylus thylogale n. sp. (Nematoda: Strongylida) from the stomachs of macropodid marsupials defined by morphological and molecular criteria.
[So] Source:Syst Parasitol;93(8):749-60, 2016 Oct.
[Is] ISSN:1573-5192
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Pharyngostrongylus thylogale n. sp. (Nematoda: Strongylida) is described from the stomach of the red-legged pademelon, Thylogale stigmatica (Gould) (Marsupialia: Macropodidae) from north-eastern Queensland and Papua New Guinea, having formerly been confused with P. iota Johnston & Mawson, 1939. Pharyngostrongylus thylogale n. sp. differs from all congeners in having 12 labial crown elements rather than eight or 16. Pharyngostrongylus iota was found in T. stigmatica, but only in southern Queensland and northern New South Wales, in the subspecies T. s. wilcoxi, compared with P. thylogale n. sp. which was found in T. s. stigmatica in northern Queensland and T. s. oriomo in Papua New Guinea. Differences in the sequences of the first and second internal transcribed spacers (ITS-1 and ITS-2) of the nuclear ribosomal DNA of P. thylogale n. sp. and ten congeners support the erection of the new species, and the validity of the morphospecies examined. However, results of the phylogenetic analyses of the molecular data also provide evidence for the existence of cryptic species within P. kappa Mawson, 1965. No obvious co-evolutionary relationships were observed between parasite species and their macropodid marsupial hosts.
[Mh] Termos MeSH primário: Macropodidae/parasitologia
Estrongilídios/classificação
[Mh] Termos MeSH secundário: Animais
DNA Espaçador Ribossômico/genética
New South Wales
Papua Nova Guiné
Filogenia
Queensland
Especificidade da Espécie
Estômago/parasitologia
Estrongilídios/anatomia & histologia
Estrongilídios/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Ribosomal Spacer)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171101
[Lr] Data última revisão:
171101
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160918
[St] Status:MEDLINE
[do] DOI:10.1007/s11230-016-9661-9


  9 / 227 MEDLINE  
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[PMID]:27238013
[Au] Autor:Laing R; Martinelli A; Tracey A; Holroyd N; Gilleard JS; Cotton JA
[Ad] Endereço:University of Glasgow, Glasgow, Scotland, United Kingdom.
[Ti] Título:Haemonchus contortus: Genome Structure, Organization and Comparative Genomics.
[So] Source:Adv Parasitol;93:569-98, 2016.
[Is] ISSN:2163-6079
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:One of the first genome sequencing projects for a parasitic nematode was that for Haemonchus contortus. The open access data from the Wellcome Trust Sanger Institute provided a valuable early resource for the research community, particularly for the identification of specific genes and genetic markers. Later, a second sequencing project was initiated by the University of Melbourne, and the two draft genome sequences for H. contortus were published back-to-back in 2013. There is a pressing need for long-range genomic information for genetic mapping, population genetics and functional genomic studies, so we are continuing to improve the Wellcome Trust Sanger Institute assembly to provide a finished reference genome for H. contortus. This review describes this process, compares the H. contortus genome assemblies with draft genomes from other members of the strongylid group and discusses future directions for parasite genomics using the H. contortus model.
[Mh] Termos MeSH primário: Genoma Helmíntico/genética
Genômica
Hemoncose/veterinária
Haemonchus/genética
Estrongilídios/genética
[Mh] Termos MeSH secundário: Animais
Hemoncose/parasitologia
Sintenia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170323
[Lr] Data última revisão:
170323
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160531
[St] Status:MEDLINE


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[PMID]:27194703
[Au] Autor:Ezenwa VO; Snider MH
[Ad] Endereço:Odum School of Ecology and Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, USA vezenwa@uga.edu.
[Ti] Título:Reciprocal relationships between behaviour and parasites suggest that negative feedback may drive flexibility in male reproductive behaviour.
[So] Source:Proc Biol Sci;283(1831), 2016 05 25.
[Is] ISSN:1471-2954
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Parasites are ubiquitous components of the environment that contribute to behavioural and life-history variation among hosts. Although it is well known that host behaviour can affect parasite infection risk and that parasites can alter host behaviour, the potential for dynamic feedback between these processes is poorly characterized. Using Grant's gazelle (Nanger granti) as a model, we tested for reciprocal effects of behaviour on parasites and parasites on behaviour to understand whether behaviour-parasite feedback could play a role in maintaining variation in male reproductive behaviour. Adult male gazelles either defend territories to attract mates or reside in bachelor groups. Territoriality is highly variable both within- and between-individuals, suggesting that territory maintenance is costly. Using a combination of longitudinal and experimental studies, we found that individual males transition frequently between territorial and bachelor reproductive status, and that elevated parasite burdens are a cost of territoriality. Moreover, among territorial males, parasites suppress aspects of behaviour related to territory maintenance and defence. These results suggest that territorial behaviour promotes the accumulation of parasites in males, and these parasites dampen the very behaviours required for territory maintenance. Our findings suggest that reciprocal feedback between host behaviour and parasitism could be a mechanism maintaining variation in male reproductive behaviour in the system.
[Mh] Termos MeSH primário: Antílopes/fisiologia
Antílopes/parasitologia
Comportamento Sexual Animal
Territorialidade
[Mh] Termos MeSH secundário: Animais
Fezes/parasitologia
Quênia
Estudos Longitudinais
Masculino
Estrongilídios/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170714
[Lr] Data última revisão:
170714
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160520
[St] Status:MEDLINE



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