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[PMID]:28832688
[Au] Autor:Riley SP; Pruneau L; Martinez JJ
[Ad] Endereço:Vector-Borne Disease Laboratories, Department of Pathobiological Sciences, Louisiana State University School of Veterinary Medicine, Baton Rouge, Louisiana, United States of America.
[Ti] Título:Evaluation of changes to the Rickettsia rickettsii transcriptome during mammalian infection.
[So] Source:PLoS One;12(8):e0182290, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The lifecycle of Rickettsia rickettsii includes infection of both mammalian and arthropod hosts, with each environment presenting distinct challenges to survival. As such, these pathogens likely have distinctive transcriptional strategies for infection of each host. Herein, we report the utilization of next generation sequencing (RNAseq) and bioinformatic analysis techniques to examine the global transcriptional profile of R. rickettsii within an infected animal, and to compare that data to transcription in tissue culture. The results demonstrate substantial R. rickettsii transcriptional alteration in vivo, such that the bacteria are considerably altered from cell culture. Identification of significant transcriptional changes and validation of RNAseq by quantitative PCR are described with particular emphasis on known antigens and suspected virulence factors. Together, these results suggest that transcriptional regulation of a distinct cohort of genes may contribute to successful mammalian infection.
[Mh] Termos MeSH primário: Mamíferos/microbiologia
Rickettsia rickettsii/genética
Transcriptoma
[Mh] Termos MeSH secundário: Animais
Genes Bacterianos
Reação em Cadeia da Polimerase Via Transcriptase Reversa
[Pt] Tipo de publicação:JOURNAL ARTICLE; VALIDATION STUDIES
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171025
[Lr] Data última revisão:
171025
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170824
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182290


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[PMID]:28582429
[Au] Autor:Polo G; Mera Acosta C; Labruna MB; Ferreira F
[Ad] Endereço:Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine, University of São Paulo, São Paulo, SP, Brazil.
[Ti] Título:Transmission dynamics and control of Rickettsia rickettsii in populations of Hydrochoerus hydrochaeris and Amblyomma sculptum.
[So] Source:PLoS Negl Trop Dis;11(6):e0005613, 2017 Jun.
[Is] ISSN:1935-2735
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Brazilian Spotted Fever (BSF), caused by the bacterium Rickettsia rickettsii, is the tick-borne disease that generates the largest number of human deaths in the world. In Brazil, the current increase of BSF human cases has been associated with the presence and expansion of capybaras Hydrochoerus hydrochaeris, which act as primary hosts for the tick Amblyomma sculptum, vector of the R. rickettsii in this area. METHODS: We proposed a semi-discrete-time stochastic model to evaluate the role of capybaras in the transmission dynamics of R. rickettsii. Through a sensitivity analysis, we identified the parameters with significant influence on the R. rickettsii establishment. Afterward, we implemented the Gillespie's algorithm to simulate the impact of potential public health interventions to prevent BSF human cases. RESULTS: The introduction of a single infected capybara with at least one infected attached tick is enough to trigger the disease in a non-endemic area. We found that to avoid the formation of new BSF-endemic areas, it is crucial to impede the emigration of capybaras from endemic areas by reducing their birth rate by more than 58%. Model results were corroborated by ex-situ data generated from field studies, and this supports our proposal to prevent BSF human cases by implementing control strategies focused on capybaras. CONCLUSION: The proposed stochastic model illustrates how strategies for the control and prevention of vector-borne infectious diseases can be focused on amplifier hosts management practices. This work provides a basis for future prevention strategies for other neglected vector-borne diseases.
[Mh] Termos MeSH primário: Ixodidae/microbiologia
Rickettsia rickettsii/isolamento & purificação
Febre Maculosa das Montanhas Rochosas/veterinária
Roedores/microbiologia
[Mh] Termos MeSH secundário: Animais
Simulação por Computador
Modelos Biológicos
Febre Maculosa das Montanhas Rochosas/microbiologia
Febre Maculosa das Montanhas Rochosas/transmissão
Processos Estocásticos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[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:170606
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pntd.0005613


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[PMID]:28377149
[Au] Autor:Brites-Neto J; Brasil J; de Andrade J; Saqui GL
[Ad] Endereço:University of São Paulo, São Paulo, Brazil; Surveillance Program and Ticks Control, Health Department, Americana, Brazil. Electronic address: samevet@yahoo.com.br.
[Ti] Título:Evaluation of an association of alpha-cypermethrin and flufenoxuron for tick control in an area at risk of Brazilian spotted fever.
[So] Source:Vet Parasitol;238:1-4, 2017 Apr 30.
[Is] ISSN:1873-2550
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Brazilian spotted fever (BSF) is an endemic anthropozoonosis caused by Gram-negative bacteria (Rickettsia rickettsii) that is associated with the risk of human infection by ticks. In the city of Americana, São Paulo (SP), Brazil, there were 12 cases (67% lethal) between 2004 and 2015. This study evaluated the effectiveness of control over tick infestations in an area at risk of BSF, in a field trial on an association of alpha-cypermethrin (3%) and flufenoxuron (3%) (Tenopa ) conducted in Americana. The infestation levels of the target species (Amblyomma sculptum and Amblyomma dubitatum) in the field trial were evaluated through acarological surveys (CO traps) on days 0, 22, 43 and 62 after treatment, both in the treatment area and in a control area. In the treatment area, the insecticide formulation was applied using a motorized sprayer, at the dosage of 80mL/10L of water per 200m . These surveys in the treatment area showed that there were reductions in the infestation levels of the adult stage on days 22 (33%), 43 (87%) and 62 (70%) and immature stages (nymphs and larvae) on days 22 (54%), 43 (87%) and 62 (97%), in relation to day zero and to infestation levels in the control area. This study demonstrated that the product applied was effective for reducing the environmental infestation of ticks and that this effect persisted two months after a single application in areas of proven risk of BSF.
[Mh] Termos MeSH primário: Ixodidae/efeitos dos fármacos
Compostos de Fenilureia/farmacologia
Piretrinas/farmacologia
Infecções por Rickettsia/prevenção & controle
Controle de Ácaros e Carrapatos/métodos
[Mh] Termos MeSH secundário: Acaricidas/farmacologia
Animais
Brasil/epidemiologia
Seres Humanos
Infecções por Rickettsia/epidemiologia
Infecções por Rickettsia/transmissão
Rickettsia rickettsii
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acaricides); 0 (Phenylurea Compounds); 0 (Pyrethrins); 1TR49121NP (cypermethrin); OD068OSS0N (flufenoxuron)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171030
[Lr] Data última revisão:
171030
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170406
[St] Status:MEDLINE


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[PMID]:28365226
[Au] Autor:Álvarez-Hernández G; Roldán JFG; Milan NSH; Lash RR; Behravesh CB; Paddock CD
[Ad] Endereço:Department of Medicine and Health Sciences, University of Sonora, Hermosillo, Sonora, Mexico. Electronic address: galvarezh63@gmail.com.
[Ti] Título:Rocky Mountain spotted fever in Mexico: past, present, and future.
[So] Source:Lancet Infect Dis;17(6):e189-e196, 2017 Jun.
[Is] ISSN:1474-4457
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Rocky Mountain spotted fever, a tick-borne zoonosis caused by Rickettsia rickettsii, is among the most lethal of all infectious diseases in the Americas. In Mexico, the disease was first described during the early 1940s by scientists who carefully documented specific environmental determinants responsible for devastating outbreaks in several communities in the states of Sinaloa, Sonora, Durango, and Coahuila. These investigators also described the pivotal roles of domesticated dogs and Rhipicephalus sanguineus sensu lato (brown dog ticks) as drivers of epidemic levels of Rocky Mountain spotted fever. After several decades of quiescence, the disease re-emerged in Sonora and Baja California during the early 21st century, driven by the same environmental circumstances that perpetuated outbreaks in Mexico during the 1940s. This Review explores the history of Rocky Mountain spotted fever in Mexico, current epidemiology, and the multiple clinical, economic, and social challenges that must be considered in the control and prevention of this life-threatening illness.
[Mh] Termos MeSH primário: Surtos de Doenças/história
Doenças do Cão/história
Febre Maculosa das Montanhas Rochosas/epidemiologia
Febre Maculosa das Montanhas Rochosas/história
[Mh] Termos MeSH secundário: Animais
Doenças do Cão/epidemiologia
Cães
História do Século XX
História do Século XXI
Seres Humanos
México/epidemiologia
Rhipicephalus sanguineus/genética
Rickettsia rickettsii/isolamento & purificação
Febre Maculosa das Montanhas Rochosas/prevenção & controle
Infestações por Carrapato
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170627
[Lr] Data última revisão:
170627
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170403
[St] Status:MEDLINE


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[PMID]:28169507
[Au] Autor:de Oliveira SV; Willemann MCA; Gazeta GS; Angerami RN; Gurgel-Gonçalves R
[Ad] Endereço:Graduate Program in Tropical Medicine at the University of Brasília, Brasília, DF, Brazil.
[Ti] Título:Predictive Factors for Fatal Tick-Borne Spotted Fever in Brazil.
[So] Source:Zoonoses Public Health;64(7):e44-e50, 2017 Nov.
[Is] ISSN:1863-2378
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:In Brazil, two pathogenic Rickettsia species have been identified causing tick-borne spotted fever (SF). The aetiological agent Rickettsia rickettsii causes serious illness, particularly in the south-eastern region of the country. Moreover, the Rickettsia sp. strain Atlantic Rainforest cause milder clinical manifestations in south-eastern, south and north-east regions. This study has sought to analyse predictive factors for fatal SF. A case-control study was performed using disease notification records in Brazil. The cases included were individuals with laboratory confirmation and fatal progression of SF, while the controls included individuals with SF who were cured. A total of 386 cases and 415 controls were identified (1 : 1.1), and the cases and controls were similar in age. The factors identified as being protective against death were reported presence of ticks (odds ratio [OR], 0.60; 95% confidence interval [CI], 0.41-0.88), residing in urban areas (OR, 0.47, 95% CI, 0.31-0.74) and presenting lymphadenopathy (OR, 0.43; 95% CI, 0.23-0.82). Males exhibited a greater chance of death (OR, 1.57; 95% CI, 1.13-2.18), as did patients who were hospitalized (OR, 10.82; 95% CI, 6.38-18.35) and who presented hypotension or shock (OR, 10.80; 95% CI, 7.33-15.93), seizures (OR, 11.24; 95% CI, 6.49-19.45) and coma (OR of 15.16; 95% CI, 8.51-27.02). The study demonstrates the severity profile of the SF cases, defined either as the frequency of hospitalization (even in cases that were cured) or as the increased frequency of the clinical complications typically found in critical patients. Opportune clinical diagnosis, a careful evaluation of the epidemiological aspects of the disease and adequate care for patients are determining factors for reducing SF fatality rates.
[Mh] Termos MeSH primário: Rickettsia rickettsii/patogenicidade
Febre Maculosa das Montanhas Rochosas/microbiologia
Febre Maculosa das Montanhas Rochosas/mortalidade
[Mh] Termos MeSH secundário: Adolescente
Adulto
Brasil
Estudos de Casos e Controles
Feminino
Seres Humanos
Masculino
Meia-Idade
Fatores de Risco
Febre Maculosa das Montanhas Rochosas/epidemiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171109
[Lr] Data última revisão:
171109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170208
[St] Status:MEDLINE
[do] DOI:10.1111/zph.12345


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[PMID]:28031280
[Au] Autor:Noriea NF; Clark TR; Mead D; Hackstadt T
[Ad] Endereço:Host-Parasite Interactions Section, Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA.
[Ti] Título:Proteolytic Cleavage of the Immunodominant Outer Membrane Protein rOmpA in Rickettsia rickettsii.
[So] Source:J Bacteriol;199(6), 2017 Mar 15.
[Is] ISSN:1098-5530
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:, the causative agent of Rocky Mountain spotted fever, contains two immunodominant proteins, rOmpA and rOmpB, in the outer membrane. Both rOmpA and rOmpB are conserved throughout spotted fever group rickettsiae as members of a family of autotransporter proteins. Previously, it was demonstrated that rOmpB is proteolytically processed, with the cleavage site residing near the autotransporter domain at the carboxy-terminal end of the protein, cleaving the 168-kDa precursor into apparent 120-kDa and 32-kDa fragments. The 120- and 32-kDa fragments remain noncovalently associated on the surface of the bacterium, with implications that the 32-kDa fragment functions as the membrane anchor domain. Here we present evidence for a similar posttranslational processing of rOmpA. rOmpA is expressed as a predicted 224-kDa precursor yet is observed on SDS-PAGE as a 190-kDa protein. A small rOmpA fragment of ∼32 kDa was discovered during surface proteome analysis and identified as the carboxy-terminal end of the protein. A rabbit polyclonal antibody was generated to the autotransporter region of rOmpA and confirmed a 32-kDa fragment corresponding to the calculated mass of a proteolytically cleaved rOmpA autotransporter region. N-terminal amino acid sequencing revealed a cleavage site on the carboxy-terminal side of Ser-1958 in rOmpA. An avirulent strain of Iowa deficient in rOmpB processing was also defective in the processing of rOmpA. The similarities of the cleavage sites and the failure of Iowa to process either rOmpA or rOmpB suggest that a single enzyme may be responsible for both processing events. Members of the spotted fever group of rickettsiae, including , the etiologic agent of Rocky Mountain spotted fever, express at least four autotransporter proteins that are protective antigens or putative virulence determinants. One member of this class of proteins, rOmpB, is proteolytically processed to a passenger domain and an autotransporter domain that remain associated on the rickettsial outer membrane. The protease responsible for this posttranslation processing remains unknown. Here we show that another autotransporter, rOmpA, is similarly processed by Similarities in sequence at the cleavage site and predicted secondary protein structure suggest that all four autotransporters may be processed by the same outer membrane protease.
[Mh] Termos MeSH primário: Proteínas da Membrana Bacteriana Externa/metabolismo
Regulação Bacteriana da Expressão Gênica/fisiologia
Rickettsia rickettsii/metabolismo
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Animais
Proteínas da Membrana Bacteriana Externa/genética
Feminino
Genoma Bacteriano
Cobaias
Rickettsia rickettsii/genética
Febre Maculosa das Montanhas Rochosas/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bacterial Outer Membrane Proteins); 0 (rOmpA, Rickettsia)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161230
[St] Status:MEDLINE


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[PMID]:27880877
[Au] Autor:Scinachi CA; Takeda GA; Mucci LF; Pinter A
[Ad] Endereço:Faculdade de Saúde Pública - Universidade de São Paulo, São Paulo, SP, Brazil; Superintendência de Controle de Endemias, São Paulo, SP, Brazil.
[Ti] Título:Association of the occurrence of Brazilian spotted fever and Atlantic rain forest fragmentation in the São Paulo metropolitan region, Brazil.
[So] Source:Acta Trop;166:225-233, 2017 Feb.
[Is] ISSN:1873-6254
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Brazilian Spotted Fever (BSF) is a zoonotic disease caused by the bacterium Rickettsia rickettsii. In the São Paulo Metropolitan Region (SPMR) it is transmitted by Amblyomma aureolatum ticks. In this region, annual lethality of the disease can reach 80% and spatial occurrence depends on environmental factors and more particularly on the presence and interaction of domestic and wild carnivores as well as the presence and characteristics of the remnant Atlantic Rain Forest patches. This study analyzed the association between forest fragmentation and its influence on the risk of occurrence of the disease in the human population. Domestic dogs tested for R. rickettsii antibodies in nine different areas under the influence of different patterns of Rain Forest fragmented landscapes and human occupancy. Landscape metrics were obtained by analyzing satellite images and high-resolution orthophotos. Principal component analysis (PCA) was used to determine among the different landscape variables the one that could best explain the data variance, and the results were tested against canine seroprevalence in order to address disease occurrence risk levels. From 270 canine samples, the seroprevalence ranged from 0 to 37%. PCA showed an inverse correlation between functionally connected large forest patches and the canine seroprevalence for R. rickettsii (p=0.030; Spearman's R=-0.683), while there was a positive correlation between forest border effect and canine seroprevalence (p=0.037; Spearman's R=- 0.909). The further attributed disease occurrence risk level supported the real spatial prevalence of the disease reported for the last eight years (p=0.023; Spearman's R=0.63). The results suggest an important relation of deforestation and fragmentation with the occurrence of BSF in the SPMR.
[Mh] Termos MeSH primário: Vetores Aracnídeos/microbiologia
Doenças do Cão/epidemiologia
Floresta Úmida
Rickettsia rickettsii/isolamento & purificação
Febre Maculosa das Montanhas Rochosas/veterinária
[Mh] Termos MeSH secundário: Animais
Animais Domésticos/microbiologia
Anticorpos Antibacterianos/sangue
Brasil/epidemiologia
Doenças do Cão/microbiologia
Cães
Técnica Indireta de Fluorescência para Anticorpo
Seres Humanos
Análise de Componente Principal
Medição de Risco
Fatores de Risco
Febre Maculosa das Montanhas Rochosas/epidemiologia
Febre Maculosa das Montanhas Rochosas/microbiologia
Estudos Soroepidemiológicos
Carrapatos/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antibodies, Bacterial)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161124
[St] Status:MEDLINE


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Colombo, Silvia
Labruna, Marcelo Bahia
Texto completo SciELO Brasil
[PMID]:27812666
[Au] Autor:Oliveira SV; Caldas EP; Colombo S; Gazeta GS; Labruna MB; Santos FC; Angerami RN
[Ad] Endereço:Secretaria de Vigilância em Saúde, Ministério da Saúde, Brasília, Distrito Federal, Brazil.
[Ti] Título:A fatal case of Brazilian spotted fever in a non-endemic area in Brazil: the importance of having health professionals who understand the disease and its areas of transmission.
[So] Source:Rev Soc Bras Med Trop;49(5):653-655, 2016 Sep-Oct.
[Is] ISSN:1678-9849
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:Brazilian spotted fever (BSF) is caused by the bacterium Rickettsia rickettsii. Because of its high case-fatality rate and apparent increase in areas of transmission, it is considered to be the rickettsial illness of primary public health interest. Cases of this disease have historically occurred in Southeastern Brazil. This article reports the first fatal case of BSF in Southern Brazil. This case high lights the importance of BSF to be considered as a differential diagnosis for acute hemorrhagic fever in areas where cases of BSF may not be expected.
[Mh] Termos MeSH primário: Febre Maculosa das Montanhas Rochosas/diagnóstico
[Mh] Termos MeSH secundário: Anticorpos Antibacterianos/sangue
Brasil
Criança
Evolução Fatal
Feminino
Seres Humanos
Rickettsia rickettsii/imunologia
[Pt] Tipo de publicação:CASE REPORTS
[Nm] Nome de substância:
0 (Antibodies, Bacterial)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161105
[St] Status:MEDLINE


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[PMID]:27723622
[Au] Autor:Seijo A; Giamperetti S; Ortiz Mayor SM; González MB; Ortega ES; González RC
[Ad] Endereço:Servicio de Zoonosis, Hospital de Enfermedades Infecciosas F. J. Muñiz, Buenos Aires, Argentina, E-mail: ceijo@intramed.net.ar.
[Ti] Título:[Severe spotted fever by Rickettsia rickettsii, in tourist in the Argentine Northwest].
[Ti] Título:Fiebre manchada grave por Rickettsia rickettsii en turista en el noroeste argentino..
[So] Source:Medicina (B Aires);76(5):317-320, 2016.
[Is] ISSN:0025-7680
[Cp] País de publicação:Argentina
[La] Idioma:spa
[Ab] Resumo:On the fifth day after leaving the Parque Nacional El Rey, province of Salta, Argentina, where she made rural tourism, a woman of Italian origin, aged 47, developed an acute fever followed by a petechial and purpuric rash that progressed rapidly to multiorgan failure. She died on the sixth day after hospitalization. There were references to tick bites and a skin lesion similar to tache noire was found. The autopsy showed generalized vasculitis, ascites, pulmonary edema, acute tubular necrosis and portal centrilobular necrosis. Spleen and liver tissue were processed for PCR Rickettsia spp, based on the detection of the gltA gene. The result was positive. The amplicons obtained were sequenced and the results were compared with the preset sequences on the BLAST program, 99% coinciding with R. rickettsii. The low sensitivity of the health system to recognize this disease and the insufficient information generated from tourism-related media are factors that affect the delay to implement effective treatment and appropriate prevention standards.
[Mh] Termos MeSH primário: Rickettsia rickettsii/isolamento & purificação
Febre Maculosa das Montanhas Rochosas/microbiologia
[Mh] Termos MeSH secundário: Animais
Argentina
Evolução Fatal
Feminino
Seres Humanos
Ixodidae/microbiologia
Meia-Idade
Insuficiência de Múltiplos Órgãos/microbiologia
Febre Maculosa das Montanhas Rochosas/complicações
[Pt] Tipo de publicação:CASE REPORTS
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170731
[Lr] Data última revisão:
170731
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161011
[St] Status:MEDLINE


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[PMID]:27677425
[Au] Autor:Tarragona EL; Soares JF; Costa FB; Labruna MB; Nava S
[Ad] Endereço:Estación Experimental Agropecuaria Rafaela, Instituto Nacional de Tecnología Agropecuaria, Consejo Nacional de Investigaciones Científicas y Técnicas, Rafaela, Argentina. tarragona.evelina@inta.gob.ar.
[Ti] Título:Vectorial competence of Amblyomma tonelliae to transmit Rickettsia rickettsii.
[So] Source:Med Vet Entomol;30(4):410-415, 2016 Dec.
[Is] ISSN:1365-2915
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The aim of this work was to test the vectorial competence of Amblyomma tonelliae (Ixodida: Ixodidae) to transmit Rickettsia rickettsii (Rickettsiales: Rickettsiaceae), the agent of Rocky Mountain spotted fever (RMSF). All parasitic stages of A. tonelliae were exposed to R. rickettsii by allowing each stage to feed on hosts inoculated with this pathogen. Thereafter, ticks were fed on uninfected hosts. All stages of A. tonelliae were able to acquire the R. rickettsii infection and maintain it by transstadial and transovarial transmission. When infected ticks fed on uninfected hosts, the hosts developed rickettsiosis disease. This study demonstrates the vectorial competence of A. tonelliae to transmit R. rickettsii. These results have epidemiological relevance because A. tonelliae is one of the tick species most likely to infest humans in Argentina, including in areas in which RMSF has been reported.
[Mh] Termos MeSH primário: Vetores Aracnídeos/fisiologia
Ixodidae/fisiologia
Rickettsia rickettsii/fisiologia
Febre Maculosa das Montanhas Rochosas/transmissão
[Mh] Termos MeSH secundário: Animais
Vetores Aracnídeos/crescimento & desenvolvimento
Vetores Aracnídeos/microbiologia
Argentina
Comportamento Alimentar
Feminino
Ixodidae/crescimento & desenvolvimento
Ixodidae/microbiologia
Larva/crescimento & desenvolvimento
Larva/microbiologia
Larva/fisiologia
Ninfa/crescimento & desenvolvimento
Ninfa/microbiologia
Ninfa/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160929
[St] Status:MEDLINE
[do] DOI:10.1111/mve.12189



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