Four forms of salmonellosis were recognised in feedlots and during tra
nsport by sea: septicaemic, and acute, subacute and chronic enteric. T
he severity and distribution of lesions in the enteric forms varied ac
cording to the progression of the pathological process. The acute dise
ase involved the abomasum and small Intestine whereas the subacute dis
ease centred on the lower small intestine and upper large intestine. C
hronic disease involved considerable mucosal repair in the Ileum, caec
um and proximal colon. Septicaemic salmonellosis was often accompanied
by acute enteritis and occasionally by cholecystitis. S typhimurium w
as the most frequently encountered serotype.