Resultado da pesquisa (3)
Termo utilizado na pesquisa Potomac horse fever
#1 - An outbreak of Potomac horse fever
Abstract in English:
Potomac horse fever (PHF) is caused by Neorickettsia risticii and the recently identified Neorickettsia findlayensis and is characterized by clinical signs such as diarrhea, hyporexia, and lethargy. PHF outbreaks are uncommon. The aim of this report is to describe the epidemiological, clinical, clinicopathological, and molecular aspects of a PHF outbreak in Brazil. An outbreak of gastrointestinal disease was investigated, and clinical and laboratory evaluations were performed in affected animals. A total of 37 out of 216 horses (17%) were affected by diarrhea, lethargy, and hyporexia during the outbreak. Only one horse developed laminitis, and five horses died. Blood and fecal samples from 17 of 37 affected mares were tested for N. risticii by qPCR. N. risticii was detected in 16/17 fecal samples and 11/16 blood samples. Oxytetracycline (BID) was an effective treatment for affected horses. The genetic analysis of N. risticii revealed similarity with strains described in North America. PHF must be included in the differential diagnosis of adult horses presenting diarrhea in Brazil.
Abstract in Portuguese:
A Potomac Horse Fever (PHF) é causada por Neorickettsia risticii e a recentemente identificada Neorickettsia findlayensis, sendo caracterizada por sinais clínicos como diarreia, hiporexia e letargia. Surtos de PHF são incomuns. O objetivo deste relato é descrever os aspectos epidemiológicos, clínicos, clínico-patológicos e moleculares de um surto de PHF no Brasil. Um surto de doença gastrointestinal foi investigado, e avaliações clínicas e laboratoriais foram realizadas nos animais afetados. Um total de 37 dos 216 cavalos (17%) apresentaram diarreia, letargia e hiporexia durante o surto. O principal sinal clínico observado foi a diarreia; apenas um equino desenvolveu laminite, e cinco equinos morreram. Amostras de sangue e fezes de 17 das 37 foram testadas para N. risticii por qPCR. N. risticii foi detectada em 16 das 17 amostras fecais e em 11 das 16 amostras de sangue. A oxitetraciclina (BID) foi tratamento eficaz para todos os equinos. A análise genética da N. risticci demonstrou similaridade com as cepas descritas na América do Norte. A PHF deve ser incluída no diagnóstico diferencial de equinos adultos apresentando diarreia.
#2 - Frequency of Equine Monocytic Ehrlichiosis (EME) in Brazil, 33(6):697-699
Abstract in English:
ABSTRACT.- Moreira L.M.C., Cardoso K.M., Aboud-Dutra A.E., Ferrão C.M. & Gazêta G.S. 2013. Frequency of Equine Monocytic Ehrlichiosis (EME) in Brazil. Pesquisa Veterinária Brasileira 33(6):697-699. Laboratório Referência Nacional em Vetores das Riquetsioses, Instituto Oswaldo Cruz, Avenida Brasil 4365, Rio de Janeiro, RJ 21040360, Brazil. E-mail: leonardo.moerbeck@ioc.fiocruz.br
From a cross-sectional observational study with convenience samples, 347 blood samples from horses were collected from different physiographic regions, as follows: Santa Catarina Plateau (Santa Catarina State - SC), Médio Paraíba do Sul (São Paulo State - SP and Rio de Janeiro State - RJ), Mountainous and Metropolitan regions (Rio de Janeiro State - RJ). Samples were tested for the presence of antibodies (IgG) anti Neorickettsia risticii by indirect immunofluorescence assay (IFA). The frequency obtained in this study corroborates with the ones obtained in the U.S.A., which refers to endemic regions. Fisher’s exact test showed significant differences in the number of positive animals between regions, indicating that the probability of an animal becoming infected varies depending on the area. The CI 95% revealed no association between infection and geopolitical space. Moreover, Odds ratio test showed differences of an animal getting infected in different regions. This event could be influenced by the type of treatment used in each area, as the seasonal frequency of injury or even potential vectors. Therefore, there are seropositive animals for N. risticii in the studied areas, suggesting that this agent may be circulating in those regions. Future studies mainly based on molecular analyzes are needed to confirm these serological findings.
Abstract in Portuguese:
RESUMO.- Moreira L.M.C., Cardoso K.M., Aboud-Dutra A.E., Ferrão C.M. & Gazêta G.S. 2013. Frequency of Equine Monocytic Ehrlichiosis (EME) in Brazil. [Relato epidemiológico da Erlichiose monocítica equina (EME) no Brasil.] Pesquisa Veterinária Brasileira 33(6):697-699. Laboratório Referência Nacional em Vetores das Riquetsioses, Instituto Oswaldo Cruz, Avenida Brasil 4365, Rio de Janeiro, RJ 21040360, Brazil. E-mail: leonardo.moerbeck@ioc.fiocruz.br
A partir de um delineamento observacional transversal com amostras de conveniência, 347 amostras de sangue foram coletadas de diferentes regiões fisiográficas: Planalto de Santa Catarina (Estado de Santa Catarina - SC), Região do Médio Paraíba do Sul (Estados de São Paulo - SP e Rio de Janeiro - RJ), Região Serrana e Metropolitana (ambas do Estado do Rio de Janeiro - RJ). As amostras foram testadas para a presença de anticorpos (IgG) anti-Neorickettsia risticii por imunofluorescência indireta (IFI). A prevalência obtida no presente estudo corrobora com demais resultados obtidos nos Estados Unidos da América. O Teste Exato de Fisher demonstrou diferença significativa no número de animais positivos entre as regiões, indicando assim que a probabilidade de um animal se infectar varia dependendo da região. O intervalo de confiança (IC 95%) revelou não haver associação entre a infecção e o espaço geopolítico, este evento pode ser influenciado pelo tipo de tratamento em cada área, como sazonalidade do agravo ou frequência de potenciais vetores. Assim, a soropositividade ora encontrada sugere a circulação de N. risticii nas áreas estudadas. Estudos futuros baseados, principalmente, em análises moleculares serão importantes para a confirmação dos achados sorológicos no presente trabalho.
#3 - Molecular detection of Neorickettsia risticii in Brazilian free-tailed bats (Tadarida brasiliensis) from Buenos Aires, Argentina, 33(5):648-650
Abstract in English:
ABSTRACT.- Cicuttin G.L., Boeri E.J., Beltrán F.J. & Gury Dohmen F.E. 2013. Molecular detection of Neorickettsia risticii in Brazilian free-tailed bats (Tadarida brasiliensis) from Buenos Aires, Argentina. Pesquisa Veterinária Brasileira 33(5):648-650. Sección Serología y Pruebas Biológicas, División Inmunología y Diagnóstico, Instituto de Zoonosis Luis Pasteur, Av. Díaz Vélez 4821, Ciudad Autónoma de Buenos Aires C1405DCD, Argentina. E-mail: gcicuttin@gmail.com
Neorickettsia risticii is the causative agent of Potomac Horse Fever, a severe febrile disease affecting horses, transmitted by trematodes species with a complex life cycle. A total of 30 insectivorous bats (Brazilian free-tailed bat Tadarida brasiliensis) were analyzed by PCR for presence of genus Anaplasma, Ehrlichia, Neorickettsia and Rickettsia. Three samples showed positive reactions for genus Anaplasma, Ehrlichia and Neorickettsia, and the sequences were 99.67% identical to Neorickettsia risticii. The role of bats in the life cycle of N. risticii has yet to be elucidated; however bats may be reservoirs for this bacterium. To our knowledge, this is the first evidence of N. risticii in Argentina.
Abstract in Portuguese:
ABSTRACT.- Cicuttin G.L., Boeri E.J., Beltrán F.J. & Gury Dohmen F.E. 2013. Molecular detection of Neorickettsia risticii in Brazilian free-tailed bats (Tadarida brasiliensis) from Buenos Aires, Argentina. Pesquisa Veterinária Brasileira 33(5):648-650. Sección Serología y Pruebas Biológicas, División Inmunología y Diagnóstico, Instituto de Zoonosis Luis Pasteur, Av. Díaz Vélez 4821, Ciudad Autónoma de Buenos Aires C1405DCD, Argentina. E-mail: gcicuttin@gmail.com
Neorickettsia risticii is the causative agent of Potomac Horse Fever, a severe febrile disease affecting horses, transmitted by trematodes species with a complex life cycle. A total of 30 insectivorous bats (Brazilian free-tailed bat Tadarida brasiliensis) were analyzed by PCR for presence of genus Anaplasma, Ehrlichia, Neorickettsia and Rickettsia. Three samples showed positive reactions for genus Anaplasma, Ehrlichia and Neorickettsia, and the sequences were 99.67% identical to Neorickettsia risticii. The role of bats in the life cycle of N. risticii has yet to be elucidated; however bats may be reservoirs for this bacterium. To our knowledge, this is the first evidence of N. risticii in Argentina.
