Strangles is enzootic in domesticated horses worldwide. Infection causes calf enteritis and contributes to the enzootic pneumonia complex in calves. Only some animals later develop a B-cell leukemia called enzootic bovine leukosis. Many veterinarians routinely test for the disease, especially in enzootic areas. Enzootic subtypes of VEE are diseases endemic to certain areas. But there is a wide range of clinical manifestations, especially in enzootic areas. Enzootic subtypes are associated with the rodent-mosquito transmission cycle. The causes of these stranding have been changing from epizootic to enzootic. Despite these efforts, plague remained an enzootic disease in the region up until 1957. Enzootic bovine leucosis is a form of leukaemia caused by the Bovine leukemia virus (BLV). Cattle that consume bracken ferns develop acute bracken poisoning and chronic bovine enzootic haematuria (BEH). It is enzootic (maintained in the population) in many bird populations, especially in Southeast Asia.