Surra (from the Marathi sūra, meaning the sound of heavy breathing through nostrils, of imitative origin)'s a disease of vertebrate animals. The disease's caused by protozoan trypanosomes of several species which infect the blood of the vertebrate host, causing fever, weakness, and lethargy which lead to weight loss and anemia. In some animals the disease's fatal unless treated. Overview An acute form of the disease, which's generally fatal unless treated, occurs in horses, donkeys, mule… (More on Surra)