» This article is about a disease. For the district in Kuwait, see Surra, Kuwait Surra (from the Marathi sūra, meaning the sound of heavy breathing through nostrils, of imitative origin) is a disease of vertebrate animals. The disease is 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 is fatal unless treated. An acute form of the dise… (More on Surra)