Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 174

This is sometimes called bovine lymphosarcoma. There are two separate diseases recognized: bovine enzootic leucosis and bovine sporadic leucosis. Bovine enzootic leucosis is linked with a retrovirus and is spread by direct contact and dirty needles. It is a notifiable disease in the UK and is confirmed by agar gel immunodiffusion (AGID). The disease has been eradicated in most EU countries but is found in North America. Bovine enzootic leucosis is normally seen in older cattle, where it causes widespread tumours. There is no treatment. Bovine sporadic leucosis is seen in young growing calves, which exhibit swollen lymph nodes, salivary glands and thymuses. The disease causes rapid emaciation and death, and is confirmed at post-mortem.