Abstract: | In Belgium, influenza virus was isolated from swine in 22 epizootics of respiratory tract disease in swine during 1984. In 8 of the epizootics, H3N2 influenza virus, related to the A/Port Chalmers/1/73 strain, was isolated. Intratracheal inoculation of the isolates induced clinical signs. It was concluded that the A/Port Chalmers/1/73 strain was established in the Belgian swine population and was responsible for the epizootics of respiratory tract disease in swine. |