Jaagsiekte is a contagious lung disease primarily affecting sheep and goats. It is caused by the jaagsiekte sheep retrovirus (JSRV), which leads to the development of tumors in the lungs. Infected animals often show symptoms such as coughing, difficulty breathing, and nasal discharge, which can significantly impact their health and productivity. The disease is transmitted through direct contact with infected animals or their bodily fluids. Control measures include culling affected animals and implementing strict biosecurity practices on farms. Vaccines are not available, making prevention and management crucial for livestock health in affected regions.