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dc.contributor.authorSantos, Débora Martins dos-
dc.date.accessioned2025-01-17T17:49:48Z-
dc.date.available2025-01-17T17:49:48Z-
dc.date.issued2021-08-30-
dc.identifier.citationSANTOS, Débora Martins dos. Aspectos epidemiológicos e moleculares de Ehrlichia canis em cães domiciliados em municípios com diferentes altitudes no Estado do Rio de Janeiro. 2021. 80f. Tese (Doutorado em Ciências Veterinárias) - Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2021.pt_BR
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/19713-
dc.description.abstractA Erlichiose Monocítica Canina é uma das doenças mais diagnosticadas na rotina da clínica veterinária de pequenos animais. O estudo objetivou analisar a epidemiologia e a variabilidade genética da sequência 16S rRNA de Ehrlichia canis em amostras de sangue de cães domiciliados em municípios do estado do Rio de Janeiro: Barra do Piraí, Paracambi, Petrópolis e Teresópolis; em diferentes gradientes de altitude, pelo período de um ano. Um total de 456 amostras de sangue foram coletadas para análise epidemiológica e molecular. O DNA total foi extraído das amostras com a utilização do Kit comercial de extração DNeasy Blood & Tissue kit QIAGEN. As amostras de DNA foram submetidas a qPCR com alvo na sequência 16S rDNA, seguindo protocolo previamente descrito na literatura. Posteriormente, foram realizadas duas reações de PCR convencional, também descritas na literatura, objetivando caracterizar a sequência 16S rRNA das amostras positivas. No modelo de regressão logística, foi observada uma associação entre a frequência de cães positivos para E. canis e a altitude (p<0.002). Os cães domiciliados nos municípios de baixa altitude demonstram 2,18 vezes mais chances de infecção por E. canis quando comparados com os cães domiciliados em municípios de elevada altitude. As variáveis relacionadas ao acesso a ambiente urbano, infestação por carrapatos Rhipicephalus sanguineus s.l e cães com raça definida também foram associados à presença do DNA de E. Canis. As variáveis ambientais como altitude, área de acesso dos cães, infestação por carrapatos e cães com raça explicam 73% a ocorrência de E. canis nas regiões estudadas. Esses resultados demonstram que a altitude exerce influência sobre os determinantes causais e a frequência da infecção por E. canis em cães nos municípios estudados, assim como as características intrínsecas ao cão. Na análise filogenética todas as sequências se agruparam dentro do clado de E. canis, o que demonstra que a sequência 16S rRNA é um excelente marcador filogenético para classificações taxonômicas. No entanto, por ser bastante conservado, não é tão bom para avaliar diversidades genéticas. As sequências provenientes das amostras coletadas no município de Teresópolis possuem maior variabilidade genética quando comparadas com as sequências obtidas no município de Paracambi. É possível que essa diversidade se dê por condições ambientais que ainda precisam ser elucidadas.pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectEhrlichia canispt_BR
dc.subjectepidemiologiapt_BR
dc.subjectaltitudept_BR
dc.subjectAnálise filogenéticapt_BR
dc.subjectepidemiologypt_BR
dc.subjectphylogenetic analysispt_BR
dc.titleAspectos epidemiológicos e moleculares de Ehrlichia canis em cães domiciliados em municípios com diferentes altitudes no Estado do Rio de Janeiropt_BR
dc.title.alternativeEpidemiological and molecular aspects of Ehrlichia canis in dogs living in municipalities with different altitudes in the State of Rio de Janeiroen
dc.typeTesept_BR
dc.description.abstractOtherCanine Monocytic Ehrlichiosis is one of the most diagnosed diseases in the routine of small animal veterinary clinics. The study aimed to analyze the epidemiology and genetic variability of the 16S rRNA sequence of Ehrlichia canis in blood samples from domiciled dogs in municipalities in the state of Rio de Janeiro: Barra do Piraí, Paracambi, Petrópolis e Teresópolis; in different altitude gradients, for a period of one year. A total of 456 blood samples were collected for epidemiological and molecular analysis. A total of 456 blood samples were collected for epidemiological and molecular analysis. Total DNA was extracted from the samples using the commercial QIAGEN DNeasy Blood & Tissue Extraction Kit. DNA samples were subjected to qPCR targeting the 16S rDNA sequence, following a protocol previously described in the literature. Subsequently, two conventional PCR reactions were performed, also described in the literature, aiming to characterize the 16S rRNA sequence of the positive samples. In the logistic regression model, an association was observed between the frequency of E. canis positive dogs and altitude (p<0.002). Dogs living in low-lying cities are 2.18 times more likely to be infected by E. canis when compared to dogs living in high-altitude cities. Variables related to access to an urban environment, infestation by Rhipicephalus sanguineus s.l. ticks and defined breed dogs were also associated with the presence of E. canis DNA. Environmental variables such as altitudes, access area for dogs, tick infestation and breed of dogs explain 73% of the occurrence of E. canisin the regions studied. These results demonstrate that altitude influences the causal determinants and frequency of E. canis infection in dogs in the studied municipalities, as well as the intrinsic characteristics of the dog. In the phylogenetic analysis, all sequences were grouped within the E. canis clade, which demonstrates that the 16S rRNA sequence is an excellent phylogenetic marker for taxonomic classifications. However, as it is highly conserved, it is not so good for assessing genetic diversity. The sequences from the samples collected in the municipality of Teresópolis have greater genetic variability when compared with the sequences obtained in the municipality of Paracambi. It is possible that this diversity is due to environmental conditions that still need to be elucidated.en
dc.contributor.advisor1Santos, Huarrisson Azevedo-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-8218-3626pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/3751609492049306pt_BR
dc.contributor.referee1Santos, Huarrisson Azevedo-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-8218-3626pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/3751609492049306pt_BR
dc.contributor.referee2Peixoto, Maristela Peckle-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-4208-1430pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/8817867478588076pt_BR
dc.contributor.referee3Thomé, Sandra Maria Gomes-
dc.contributor.referee3IDhttps://orcid.org/0000-0003-3261-0543pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/4031503846197234pt_BR
dc.contributor.referee4Souza, Aline Moreira de-
dc.contributor.referee4Latteshttp://lattes.cnpq.br/4878965826784040pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/1089196038438824pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Veterináriapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ciências Veterináriaspt_BR
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