Tübingen, Univ., Diss., 2009.

Orientador: Paulo Eduardo Neves Ferreira Velho / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-08-09T22:53:34Z (GMT). No. of bitstreams: 1 Pitassi_LuizaHelenaUrso_M.pdf: 12609657 bytes, checksum: 75cfaf4f2545cde781142bf97752e052 (MD5) Previous issue date: 2007 / Resumo: A Bartonella henselae, uma bactéria intracelular facultativa, é conhecida como agente da doença da arranhadura do gato, da angiomatose bacilar, da peliose bacilar hepática, de endocardites e de síndromes bacterêmicas em humanos. As espécies de Bartonella podem causar infecções intra-eritrocitárias e têm sido isoladas do sangue de pacientes por vários métodos. Foi demonstrado que a B. bacilliformis e a B. quintana infectam células endoteliais e eritrócitos humanos e que a B. henselae infecta células humanas (células endoteliais, células epiteliais, monócitos, macrófagos) e eritrócitos de gatos. O objetivo deste estudo foi investigar, através da microscopia eletrônica de transmissão, se a B. henselae infecta eritrócitos humanos maduros. Uma amostra de um concentrado de hemácias foi infectada experimentalmente com uma cepa-padrão de B. henselae. Alíquotas de sangue foram coletadas da amostra imediatamente após a infecção experimental, no minuto 30 e nas horas 1, 5, 10 e 72 para avaliação ultra-estrutural. A B. henselae foi vista aderida a eritrócitos humanos dez horas após a inoculação e no interior de eritrócitos após setenta e duas horas. Este estudo demonstra que a B. henselae se adere a e invade eritrócitos humanos maduros. Nossos resultados favorecem a possibilidade de que os eritrócitos possam servir como um nicho primário nas infecções causadas por Bartonella spp.. Diante desta observação, novos estudos deverão ser realizados para prevenir a transmissão transfusional da Bartonella sp / Abstract: Bartonella henselae, a facultative intracellular bacterium, has been known as the agent of cat scratch disease, bacillary angiomatosis, peliosis hepatis, endocarditis and bacteraemic syndrome in humans. Bartonella species can cause intraerythrocytic infections and have been isolated from patients blood stream by several methods. It was demonstrated that B. bacilliformis and B. quintana infect human endothelial cells and human erythrocytes and B. henselae infects erythrocytes of cats. The aim of our study was to investigate through transmission electron microscopy whether B. henselae infects mature human erythrocytes. One sample of red blood cell (RBC) unit received experimentally standard strain of B. henselae. Blood aliquots were collected from infected unit immediately after inoculation, on minute 30 and on hours 1, 5, 10 and 72 for ultrastructural evaluation. B. henselae was seen adhered to human erythrocytes ten hours after inoculation and inside the erythrocyte after seventy two hours. This study demonstrates that B. henselae adhere to and invades mature human erythrocytes. Our results favor the possibility that erythrocytes can serve as a primary target in Bartonella spp. infections. From this observation, further studies are warranted to prevent Bartonella transfusional transmission / Mestrado / Clinica Medica / Mestre em Clinica Medica

Tübingen, Univ., Diss., 2004.

Universiẗat, Diss., 2006--Giessen.

Zugl.: Giessen, Univ., Diss., 2006

Universiẗat, Diss., 2005--Leipzig. / Dateiformat: zip, Datei im PDF-Format.

An 11 year old, hispanic girl with a history of B-cell acute lymphoblastic leukemia was admitted to the hospital for symptoms compatible with Bartonella henselae infection. The first molecularly diagnosed case of disseminated Bartonella henselae infection was reported in an immunocompromised patient in Lima, Peru. The analysis was confirmed by Polymerase Chain Reaction and automated sequencing of a liver biopsy sample, even though the serologic tests were negative. In conclusion, Bartonella spp. infection should have a particular diagnostic consideration in immunocompromised patients with fever of unknown origin and further investigation regarding the patient's past exposures with cats should also be elicited.

Bartonella henselae es un microorganismo Gram negativo, zoonótico, oportunista y cosmopolita, causante de diversas patologías humanas emergentes y reemergentes, que varían desde infecciones autolimitantes hasta fallas multiorgánicas y muerte dependiendo del estado inmunitario del afectado. El presente estudio analítico-descriptivo fue desarrollado en dos etapas; en la primera, se estandarizó la prueba de aislamiento de Bartonella henselae cepa ATCC 49882 por el método de Shell Vial en líneas celulares continuas Vero y Hep-2, determinándose la línea celular más susceptible a la infección en un tiempo determinado de incubación. En la segunda etapa, se realizó el aislamiento primario empleando la técnica estandarizada, evaluándose 60 muestras de sangre total de pacientes procedentes del sistema de vigilancia de enfermedades febriles metaxénicas a nivel nacional (INSCNSP) asociadas a factores epidemiológicos favorables a la infección por Bartonella henselae. Las muestras seleccionadas fueron reportadas como negativas a rickettsiosis y Enfermedad de Carrión. En ambas etapas, se determinó la presencia o ausencia del microorganismo de interés mediante la técnica de Inmunofluoresecencia Indirecta (IFI-Bartonellosis), coloración Giménez y la valoración cualitativa del efecto citopático. Los resultados obtenidos aplicando la técnica estandarizada fueron, 5 aislamientos primarios a partir de 60 muestras de sangre total (3 en células Vero y 5 en células Hep-2) en un periodo de incubación de 12 días a 37°C. De los resultados obtenidos en el desarrollo de la primera y segunda etapa se concluyó que Hep-2 es la línea celular más susceptible a la infección por Bartonella henselae. Palabras claves: Bartonella henselae, Ctenocephalides felis, cultivo celular, Shell Vial, efecto citopático. / --- Bartonella henselae is a Gram-negative, zoonotic, opportunist and Cosmopolitan microorganism, responsible of diverse emergent and reemergents human pathologies that vary from autolimitant infeccions to multiorganic failures and death, depending of the inmunitarian status of the affected individual. The present study descriptive-analytic was developed in two stages. In the first, the isolation test of Bartonella henselae strain ATCC 49882 was standardized with the Shell Vial method in continuous cell strains, Vero y Hep-2, determining the most susceptible cell line in an established incubation period. In the second stage, the primary isolation was realized applying the standardized technique, with 60 total blood samples evaluated from patients belonging to the surveillance system of metaxenic febrile diseases nationwide (INS-CNSP) associated to favourable epidemiological factors to infections with Bartonella henselae. The selected samples were reported as negative to rickettsiosis and Carrion disease. In both stages, the presence or absence of the analyzed microorganism was determined through the indirect immunofluorescence technique (IFI-Bartonellosis), Giménez coloration and the qualitative assessment of the cytopathic effect. The results obtained applying the standardized technique came, 5 primary isolations from 60 samples of total blood (3 in Vero cells and 5 in Hep-2 cells) during a period of incubation of 12 days at 37 °C. From the results obtained in the development of the firstand second stage, it was concluded that Hep-2 is the most susceptible cell line to the infection by Bartonella henselae. Key words: Bartonella henselae, Ctenocephalides felis, cell culture, Shell Vial, cytophatic effect

Memoria para optar al Título Profesional de Médico Veterinario / En el presente estudio se analizaron 80 sueros de gatos con el propósito de detectar anticuerpos contra la bacteria Bartonella henselae, principal agente de la enfermedad del arañazo del gato. El diagnóstico serológico se realizó a través de inmunofluorescencia indirecta, obteniéndose un 70% de gatos con anticuerpos contra B. henselae. No se encontraron diferencias estadísticamente significativas, considerando las características individuales (edad, sexo, contacto con otros gatos, positividad al virus de la leucemia felina, total de gatos por casa y visita periódica al médico veterinario) de los gatos estudiados.

Thèse d'exercice : Médecine : Nancy 1 : 2003. / Titre provenant de l'écran-titre.