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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Diagnóstico das hemoparasitoses caninas por biologia molecular, alterações hematológicas e centrifugação por gradiente / Density gradient centrifugation, molecular biology and hematological changes in the diagnosis of canine hemoparasitoses

Oliveira, Aécio Carlos de 27 February 2015 (has links)
Submitted by Amauri Alves (amauri.alves@ufv.br) on 2015-11-04T12:14:30Z No. of bitstreams: 1 texto completo.pdf: 583903 bytes, checksum: 2502ab1ef4041967c288e1621742e282 (MD5) / Made available in DSpace on 2015-11-04T12:14:30Z (GMT). No. of bitstreams: 1 texto completo.pdf: 583903 bytes, checksum: 2502ab1ef4041967c288e1621742e282 (MD5) Previous issue date: 2015-02-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Neste estudo foram analisadas 100 amostras de sangue de cães com trombocitopenia importante (plaquetas < 100.000/μL), oriundas da rotina laboratorial de atendimento do Hospital Veterinário da Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais. Todas as amostras de sangue foram submetidas ao analisador hematológico automático, à confecção de esfregaços sanguíneos de sangue total, à capa de leucócitos e à técnica de centrifugação por gradiente de densidade. Além disto, as amostras foram submetidas à extração de DNA e posteriormente à reação em cadeia da polimerase (PCR), para o diagnóstico molecular de Ehrlichia spp., Hepatozoon sp., Babesia spp., Anaplasma spp. e Leishmania spp. Os resultados da PCR confirmaram amostras positivas para Ehrlichia spp. (69%), Hepatozoon sp. (25%), Babesia spp. (16%) e Anaplasma platys (4%), com alguns animais apresentando até três patógenos em coinfecção. Verificou-se ainda estreita relação entre a ocorrência da trombocitopenia e erliquiose e a alta frequência de coinfecções. A centrifugação por gradiente de densidade mostrou-se bastante sensível na identificação do Hepatozoon canis, com resultados superiores aos das técnicas tradicionais (esfregaço sanguíneo e capa de leucócitos) e concordância substancial com a PCR. Foram observadas diferenças significativas nos parâmetros sanguíneos entre os animais com e sem hematozoários, como a presença de desvio nuclear de neutrófilos à esquerda maior nos animais positivos para Babesia spp. e alterações no volume plaquetário médio e PDWc nos animais com erliquiose. No sequenciamento realizado, identificou-se a presença de várias espécies, incluindo Ehrlichia canis, Ehrlichia chaffeensis, Hepatozoon canis, Babesia canis vogeli, Anaplasma platys, Anaplasma phagocytophilum e Rangelia vitalii, sendo os patógenos Ehrlichia chaffeensis e Anaplasma phagocytophilum relacionados a infecções em humanos. / In this study we analyzed blood samples from 100 dogs with important thrombocytopenia (Platelets < 100.000/μL), of the routine care of the Veterinary Hospital from Universidade Federal de Viçosa (UFV). All Samples were processed on automated hematology analyzer and subjected to analysis of their blood smears, buffy coat, and the density gradient centrifugation technique. In addition, samples were subjected to procedure for DNA extraction and subsequent polymerase chain reaction (PCR) to Ehrlichia spp., Hepatozoon sp., Babesia spp., Anaplasma spp. and Leishmania spp. The PCR results confirmed positive samples to Ehrlichia spp. (69%), Hepatozoon sp. (25%), Babesia spp. (16%) and Anaplasma platys (4%), with some animals having up to three concomitant pathogens. We also found a close relationship between the occurrence of thrombocytopenia and ehrlichiosis and the high frequency of coinfection. The density gradient centrifugation showed to be more sensitive at detecting Hepatozoon canis than traditional tecniques (blood smears, buffy coat) and the results are in agreement to those by PCR. Significant differences were observed in blood parameters between animals with and without hemoparasite, such as presence of a nuclear deviation of neutrophils on the left bigger in positive animals for Babesia spp. and changes in mean platelet volume and PDWc in animals with ehrlichiosis. In the sequencing performed we identified the presence of several species, including Ehrlichia canis, Ehrlichia chaffeensis, Hepatozoon canis, Babesia canis vogeli, Anaplasma platys, Anaplasma phagocytophilum and Rangelia vitalii, being the Anaplasma phagocytophilum and Ehrlichia chaffeensis related pathogens infections in humans.

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