ABSTRACT. The swine upper respiratory tract is early colonised by Haemophilus parasuis, a bacteria which causes Glässer´s disease under favorable conditions. Glässer's disease is a septicemic infectious disease characterised by causing polyserositis. The prevention of Glässer disease still represents a big challenge for the production chain, since the mechanism of systemic infection in pigs and virulence factors that prevent phagocytosis are not yet well understood. Even in swine herds with high sanitary standard, it is the main cause of mortality that has led to productive and economic losses in the pig industry worldwide. Although the H. parasuis genome sequence has been completed already, diagnosis is still difficult due to the existence of non-virulent strains and the early colonisation of the upper respiratory tract of healthy swines. This review aims to provide up-to-date information about the etiology, epidemiology, pathogenesis, clinical signs, gross and microscopic lesions, diagnosis, treatment and control of Glässer's disease.Key words: epidemiology, swine, virulence factors, vaccines. RESUMEN.El tracto respiratorio superior del cerdo es colonizado inicialmente por Haemophilus parasuis, bacteria que en condiciones favorables causa la enfermedad de Glässer. La enfermedad de Glässer es una afección infecciosa que se caracteriza por el desarrollo de poliserositis septicémica. La prevención de esta enfermedad sigue siendo un problema en la producción porcina tecnificada, ya que los mecanismos de virulencia de este microorganismo y los factores sistémicos que impiden la fagocitosis no son bien conocidos. Inclusive en rebaños con un alto estándar de salud, H. parasuis es la principal causa de mortalidad, generando así pérdidas productivas y económicas en la industria porcina a nivel mundial. A pesar de que la secuencia del genoma de H. parasuis se ha completado recientemente, el diagnóstico aún se complica por la existencia de cepas no virulentas y la temprana colonización del tracto respiratorio superior de cerdos sanos. El objetivo de esta revisión es entregar información actualizada respecto de la etiología, epidemiología, patogénesis, signos clínicos, lesiones macroscópicas y microscópicas, diagnóstico, tratamiento y control de la enfermedad de Glässer.
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