Epidemiological aspects of infection by Haemophilus parasuis in traditional Brazilian herds

摘要

The current tendency of the industry is to keep the swine population isolated in herds of high health status. In this case the chance for the animals to acquire immunity by the natural exposure is reduced. Swine herds with high health status, underrigorous controlled management conditions to decrease the rate of disease spread, the eradication and in the control of several diseases. Haemophilus parasuis (HPS), the ethiologic agenl of Glasser's disease has been one of a few exceptions with many herds presenting severe outbreaks of polyserositis, pneumonia and meningitis. The epidemiological aspects of HPS infection in herds of high status and the presence of the disease in animals after transportation in the European and American swine industriesis known. In the tropical countries there is no description of HPS infection and also no information related to age, growth, month of the year, traditional system of swine production and simultaneous presence of other bacteriological agents. The objective of the present work was to study the epidemiological aspects of HPS infection based on the age, season, month of the year, and the simultaneous presence of the bacterial agents in swine from herds under conventional management in Brazil.