Abstract
In September 1989, a 3-month-old male dairy calf suddenly died after showing nervous signs. The autopsy disclosed remarkable meningeal hemorrhage in the cerebrum, cerebellum and medulla oblongata. Histological examination revealed purulent meningitis as well as hemorrhage and purulent lesions in various other organs. Microbiologically, Streptococcus suis was isolated from the brain and lungs. Therefore, the case was diagnosed as purulent meningitis. Serologically, this strain did not belong to any of the 9 serotypes existing in Japan.
