It is a systemic condition affecting young pigs characterised by '''polyserositis, arthritis''' and '''meningitis'''. It is rapidly fatal in the acute form, in some cases animals die before the development of obvious lesions. In older pigs respiratory signs are most common such as bronchitis. Other syndromes may also occur. | It is a systemic condition affecting young pigs characterised by '''polyserositis, arthritis''' and '''meningitis'''. It is rapidly fatal in the acute form, in some cases animals die before the development of obvious lesions. In older pigs respiratory signs are most common such as bronchitis. Other syndromes may also occur. |