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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

Studies on the physiology and pathogenesis of Leptospira pomona

Boyd, Frank McCalla. January 1959 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1959. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
2

The function of rabbit serum in the nutrition of Leptospira pomona

Johnson, Russell C. January 1960 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1960. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
3

Characterization of leptospiral lipids

White, Raymond Frederick, January 1966 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1966. / Typescript. Vita. Description based on print version record. Includes bibliographical references.
4

Freqüência de anticorpos contra Leptospira spp. em felídeos neotropicais em cativeiro no Brasil /

Guerra Neto, Guilherme. January 2006 (has links)
Orientador: Raul José Silva Gírio / Banca: Luiz Augusto do Amaral / Banca: João Barbudo Filho / Resumo: Levantamentos sorológicos em todo o mundo têm demonstrado o envolvimento de diferentes espécies silvestres na epidemiologia da da leptospirose, como roedores, edentatas, carnívoros, marsupiais e artiodáctilos. São poucos os estudos sobre a leptospirose em animais silvestres cativos, especialmente com animais neotropicais, onde a literatura é ainda mais escassa. Com o objetivo de determinar a freqüência de anticorpos contra Leptospira spp. em felídeos neotropicais e identificar os sorovares de maior predominância nas diferentes espécies estudadas, foram colhidas amostras sanguíneas de 359 felídeos de cativeiro provenientes de 41 instituições localizadas em 41 cidades nos Estados de São Paulo, Minas Gerais e Rio de Janeiro. Dos 359 soros sangüíneos, 46 (12,81%) foram reagentes no teste de soroalglutinação microscópica (SAM). As espécies de felídeos que apresentaram amostras reagentes foram: Panthera onca, Puma concolor; Leopardus pardalis, Leopardus tigrinus e Herpailurus yagouaroundi. Os felídeos .das espécies Leopardus wiedii, Oncifelis colocolo e Oncifelis geoffroy não foram reagentes. O sorovar Grippotyphosa foi o mais freqüente (39,13%) e a maior freqüência de soros reagentes foi para a espécie Leopardus pardalis (20,54%). As freqüências de animais reagentes, com exceção das jaguatiricas, quando comparadas estatisticamente entre os Estados de São Paulo e Minas Gerais não apresentaram diferença significativa. Os exames das amostras de felídeos pertencentes às instituições no Estado do Rio de Janeiro não foram suficientes para verificar a presença de anticorpos contra Leptospira spp. / Mestre
5

The diversity and ecology of Leptospira in Madagascar

Moseley, Mark January 2017 (has links)
Multi-host pathogens include some of the most important pathogens of humans and livestock and, due to their complex biology, are particularly difficult to control. Leptospirosis is one of the most common, but neglected, zoonotic diseases in the world and an important cause of production losses in livestock. In Madagascar, potentially pathogenic Leptospira have been identified in both invasive and endemic small mammal hosts with strict associations noted between Leptospira species and host genera. However, in other regions, it is understood that Leptospira can infect multiple hosts and that livestock may also be important reservoir hosts. The aim of this study was to use molecular assays to elucidate the epidemiology of Leptospira infections in small mammals and livestock and to explore their role as reservoir hosts in Madagascar. Sampling of the small mammal community was performed across a heterogeneous landscape in eastern Madagascar and abattoir sampling of livestock was undertaken. We identified complex transmission dynamics, including mixed infections, within the reservoir community with spillover between endemic and invasive small mammal hosts, small mammals and livestock and a potential molecular link between a human case of leptospirosis in Madagascar and small mammal infections. In Rattus rattus, the most abundant invasive small mammal in Madagascar, the epidemiology of L. borgpetersenii and L. interrogans infections differs and facilitation of infection between the two species occurs. Moreover, we show that invasive small mammals (R. rattus and Mus musculus) and cattle may act as epidemiological bridges and amplification hosts, respectively. The reservoir for Leptospira in Madagascar is complex and both invasive small mammals and livestock may play a significant role as sources of human infection in Madagascar. These results suggest that further research in this system has the potential to answer important questions regarding the epidemiology, ecology and evolution of multi-host pathogens.
6

Detection of Leptospira interrogans in fixed equine eyes affected with end-stage equine recurrent uveitis

Pearce, Jacqueline Winona. January 2007 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2007. / "May 2007" The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Includes bibliographical references.
7

Detección de Leptospira sp. en muestras de riñón y sangre del mustélido Neovison vison

Núñez Elgueda, Camila January 2013 (has links)
Memoria para optar al Título Profesional de Médico Veterinario / La leptospirosis es una zoonosis re-emergente de distribución mundial, producida por bacterias patógenas del genero Leptospira. El cuadro clínico en humanos varía desde asintomático hasta letal. La transmisión de la bacteria a un hospededero susceptible se realiza por contacto directo o indirecto con orina de animales infectados. Dentro de la epidemiología los cursos de agua cumplen un rol significativo, ya que la bacteria es hidrofílica, permaneciendo viable en agua por largos períodos de tiempo. Los animales de vida silvestre son un importante reservorio, siendo los roedores el caso más estudiado, también se ha evidenciado transporte renal y largos periodos de leptospiruria, en mustélidos, zorrillos y mapaches. Al respecto estudios recientes en Francia han revelado 86% de prevalencia de anticuerpos contra Leptospira, y un porte renal de un 23%, por pruebas de PCR, en visón americano (Neovison vison). Con el fin de detectar Leptospiras patógenas en visones americanos de vida libre, introducidos en el sur de Chile, se tomaron muestras de sangre y riñón desde animales capturados en 3 regiones distintas del país (Los Ríos, Los Lagos y Aysén). Se detectaron Leptospiras patógenas mediante PCR en 29 de 57 individuos. Las muestras de riñón presentaron mayores resultados positivos en proporción a la cantidad de muestras analizadas. Las regiones de los Lagos y de Aysén obtuvieron mayores tasas de captura y alto porcentaje de individuos positivos. Neovison vison presentó un alto porcentaje de portación de Leptospira (50%), pudiendo ser un importante agente diseminador de esta bacteria. Debido a su capacidad invasiva de ambientes naturales, y a la interacción con especies domésticas y silvestres nativas se deben realizar estudios que lo confirmen / Financiamiento: Proyecto Fondecyt No. 1100139
8

Infectious agents, Leptospira spp. and Bartonella spp., in blood donors from Cajamarca, Peru

Pons, Maria J., Urteaga, Numan, Alva Urcia, Carlos Alberto, Lovato, Pedro, Silva, Jaquelyne, Ruiz, Joaquim, Del Valle Mendoza, Juana, Universidad Peruana de Ciencias Aplicadas (UPC) 13 August 2015 (has links)
In blood banks the sought for a series of relevant pathogens able to be transmitted by blood transfusions is widely implemented; however the presence of a series of pathogens in blood bank donations remained understudied. This is the case of some bacteria such as Leptospira spp. or Bartonella spp. Bartonella species are bloodborne, re-emerging organisms, capable of causing prolonged infections in animals and humans. Meanwhile, Leptospirosis is recognised as an emerging public health problem worldwide. Both infections are considered neglected tropical diseases.
9

Presencia de anticuerpos contra serogrupos patógenos de Leptospira spp. en el zorro sechurano (Lycalopex sechurae) de vida libre y caninos domésticos en la comunidad campesina José Ignacio Távara Pasapera, Piura

Pacheco Sánchez, Gabriela January 2015 (has links)
La leptospirosis es una zoonosis de distribución mundial, endémica en países de clima subtropical y tropical húmedo. Afecta tanto a animales silvestres como a animales domésticos, incluyendo a los cánidos, los cuales pueden transportar las leptospiras en la orina y, por consiguiente, infectar a otros animales y humanos que interactúen con ellos. La infección es causada por especies patógenas de Leptospira spp, registrándose 14 especies actualmente, distribuidas en más de 250 serovares. El objetivo del presente estudio fue detectar la presencia de anticuerpos contra Leptospira spp. en zorros de Sechura (Lycalopex sechurae) y caninos domésticos que habitan en la comunidad campesina José Ignacio Tavara Pasapera, en Piura - Perú. Para tal fin se analizaron mediante la prueba de Microaglutinación (MAT) 11 muestras de suero de Zorros de Sechura y 80 muestras de suero de caninos domésticos, de ambos sexos y diferentes edades. De los 91 cánidos analizados, el 53.85% (49/91) fueron positivos para al menos un serovar evaluado. El 36.36% (4/11) de los zorros de Sechura tuvo presencia de anticuerpos contra algún serovar de Leptospira spp., siendo los más frecuentes los serovares Tarassovi, Javanica y Varillal; mientras que en los caninos domésticos el 56.25% (45/80) presentaron anticuerpos contra Leptospira spp., siendo los serovares más frecuentes Varillal, Canicola, Ballum y Hurtsbridge. Los resultados obtenidos indican que existen algún grado de exposición a Leptospira spp. en los zorros de Sechura y en los caninos domésticos de la comunidad estudiada, pudiendo estos constituir un posible riesgo para los animales y para las personas que habitan en la zona y/o en zonas aledañas. Palabras clave: Leptospira spp., Zorro de Sechura, caninos domésticos, prueba de microaglutinación, presencia. / --- Leptospirosis is a worldwide zoonosis, endemic in tropical and subtropical countries. It affects both wild and domestic animals, including the canids, which can transport leptospires in the urine, therefore, infecting other animals and humans that interact with them. The infection is caused by pathogenic species of Leptospira spp., consisting of 14 species currently described, distributed in more than 250 serovars. The aim of this study was to detect the presence of antibodies against Leptospira spp. in the Sechura fox (Lycalopex sechurae) and domestic canines that inhabit the José Ignacio Tavara Pasapera community, in Piura. To this end, 11 serum samples from Sechura foxes and 80 samples from domestic canines were analyzed, both from different sex and ages, using the micro agglutination test (MAT). From the 91 canids studied, 53.85% (49/91) were positive to at least one serovar tested. 36.36% (4/11) from the Zechura foxes presented antibodies against Leptospira spp., the most reagent serovars were Tarassovi, Javanica and Varillal. 56.25% (45/80) of the domestic canines were reagent against Leptospira spp., the most frequent serovars were Varillal, Canicola, Ballum and Hurtsbridge. The results indicate that there is the presence of some level of exposure to Leptospira spp. in the Sechuran foxes and the domestic canines that inhabit that community; wich makes them a possible a risk for animals and for people that inhabit that community and the surrounding areas as well. Key words: Lepstopira spp., Sechura fox, Domestic canines, Micro Aglutination Test, Presence.
10

Mastite : síndrome da queda do leite e infecção por Leptospira interrogans em ovelhas da raça Santa Inês

Rosa, Adriana Helena 01 December 2010 (has links)
Dissertação (mestrado)—Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, 2010. / Submitted by Suelen Silva dos Santos (suelenunb@yahoo.com.br) on 2010-11-25T16:02:47Z No. of bitstreams: 1 2010_AdrianaHelenaRosa.pdf: 1765942 bytes, checksum: 3be8da3748a58a4c0e116ff2bcde41c2 (MD5) / Approved for entry into archive by Daniel Ribeiro(daniel@bce.unb.br) on 2010-12-01T22:46:47Z (GMT) No. of bitstreams: 1 2010_AdrianaHelenaRosa.pdf: 1765942 bytes, checksum: 3be8da3748a58a4c0e116ff2bcde41c2 (MD5) / Made available in DSpace on 2010-12-01T22:46:47Z (GMT). No. of bitstreams: 1 2010_AdrianaHelenaRosa.pdf: 1765942 bytes, checksum: 3be8da3748a58a4c0e116ff2bcde41c2 (MD5) Previous issue date: 2010-03 / A ovinocultura tem crescido muito no Distrito Federal, bem como em toda a região Centro Oeste e os rebanhos têm evoluído principalmente em relação à composição genética e nesse sentido, a raça Santa Inês tem se destacado por apresentar alto potencial para produção de carne e adaptar-se com facilidade aos climas quentes, além de ser bastante prolífera. Porém, ainda observa-se uma imensa lacuna no que se refere às pesquisas sobre sanidade. A mastite em ovinos é de grande importância em rebanhos destinados à produção de leite, contudo, recentemente, o interesse por mastite tem aumentado também em relação a rebanhos destinados a produção de carne, pois a doença pode levar à redução no ganho de peso dos cordeiros e aumento na mortalidade. A síndrome da queda do leite consiste em uma redução brusca na produção leiteira em vacas, não acompanhada de quaisquer sinais clínicos de enfermidade, especialmente mastite, ou privação de alimento ou água. Estresse calórico, particularmente a combinação de calor e umidade, e leptospirose devido à Leptospira Hardjo, estão entre as causas mais comuns. Esta síndrome também ocorre em ovelhas, mas pouco tem sido descrito nessa espécie. Neste estudo, foram analisadas todas as ovelhas da raça Santa Inês de 12 rebanhos do Distrito Federal, totalizando 1000 animais. Deste total, 98 animais apresentaram sinais de mastite clínica (9,8%), sendo uma ocorrência alta quando comparada à encontrada por outros autores em outros países. Após sorologia, nenhuma relação entre animais soroposivos para Leptospira spp. e presença de mastite clínica e síndrome da queda do leite foi encontrada. _________________________________________________________________________________ ABSTRACT / The sheep industry has grown significantly in the Distrito Federal, as well as throughout the Midwest region. The genetic composition of flocks has evolved and the Santa Ines breed has increased in use due to high perceived potential for meat production, and adaptation to hot climates, as well as being very prolific. There is still a lack of sanity information issues. Ovine mastitis is of great importance to dairy flocks, although, recently the interest in mastitis has grown in meat-producing sheep flocks, as the disease can lead to weight loss in lambs and increase mortality. The milk drop syndrome consists of a sudden reduction in milk yield, with no clinical signs of disease, specially mastitis, or food and water deprivation. Heat stress, particularly the combination of heat and humidity, and leptospirosis due to Leptospira Hardjo are among the most common causes. This syndrome also occurs in ewes, but there are few studies in this species. In this study, were examined all ewes from 12 Santa Ines flocks in the Distrito Federal, total of 1000 animals. From these, 98 animals presented signs of clinical mastitis (9.8%), a high occurrence when compared to other authors in other countries. After serology, no relation was found between Leptospira spp. seropositives animals and the presence of clinical mastitis and milk drop syndrome.

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