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                  <mods:namePart>Vela Alonso, Ana Isabel</mods:namePart>
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                  <mods:namePart>Cid Vázquez, María Dolores</mods:namePart>
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                  <mods:namePart>Calderón Bernal, Johan Manuel</mods:namePart>
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               <mods:abstract>La enfermedad respiratoria bovina (ERB) posee una relevancia sanitaria y económica en el ganado vacuno. Es una enfermedad multifactorial y multietiológica involucrando tanto a patógenos víricos como bacterianos. Pasteurella multocida es uno de los principales patógenos implicados. No obstante, los estudios de caracterización de P. multocida asociada a ERB son escasos desconociéndose si existen clones específicos asociados a la enfermedad. Nuestra hipótesis plantea que P. multocida juega un papel importante en el desarrollo de la ERB, que los clones asociados a los casos son similares a los prevalentes en otros países y que existen, además, diferencias entre los clones aislados de casos de ERB y de animales aparentemente sanos. El objetivo general de esta tesis fue el ampliar el conocimiento del papel de P. multocida en la epidemiología de ERB. Incluye los siguientes objetivos específicos: (1) determinar la importancia relativa de P. multocida frente a los otros agentes etiológicos y su asociación con estos, (2)caracterizar los clones más prevalentes de P. multocida asociados a brotes de ERB y su diversidad genética y, (3) comparar los clones de P. multocida asociados a casos clínicos con los de animales aparentemente sanos...Bovine respiratory disease (BRD) has health and economic impact on the cattle industry. It is a multifactorial and multi-etiological disease involving both viral and bacterial pathogens. Pasteurella multocida is one of the main pathogens involved. However, characterization studies of P. multocida associated with BRD are scarce and it is not known whether there are specific clones associated with the disease. We hypothesized that P. multocida plays an important role in the development of BRD, that clones associated with clinical cases are similar to those prevalent in other countries and that there are differences between clones isolated from BRD cases and apparently healthy animals. The overall aim of this thesis was to extend the understanding of the role of P. multocida in the epidemiology of BRD. It includes the following specific objectives: (1) to determine the relative importance of P. multocida versus other etiological agents and its association with these agents, (2) to characterize the most prevalent clones of P. multocida associated with BRD outbreaks and their genetic diversity and, (3) to compare P. multocida clones associated with clinical cases with those of apparently healthy animals...</mods:abstract>
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                  <mods:title>Pasteurella multocida asociada a la Enfermedad Respiratoria Bovina</mods:title>
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