Ulcerative enteritis is an acute bacterial infection of young chickens characterized by sudden onset and rapidly increasing mortality. It is caused by gram+ bacteria called Clostridium colinum. The organism is extremely tough due to spore formation. The disease is spread through droppings. Birds may die suddenly without showing any symptoms. Extreme emaciation with reduction in breast muscle is common in broilers. The lesions include haemorrhagic enteritis mainly in deodenum. If the bird survives for several days there will be necrosis and ulceration and sometimes perforation causing peritonitis.