Enterotoxaemia is characterised by inflammation of the caecum ( and sometimes other parts of the intestinal tract. The contents of the caecum are liquid and haemorrhagicEnterotoxaemia can cause collapse and death within a few hours. Some cases develop haemorrhagic diarrhoea. Others die with no external signs. Although the condition is more common in young rabbits or after antibiotic administration, it occasionally occurs in adult pets for no apparent reason. Post-mortem examination usually shows signs of peritonitis. The caecum is inflamed and the contents are liquid.