Changes

****Occurs in older birds via inhalation of ''E. coli'' in dust; respiratory infection spreads to the blood to cause acute colisepticaemia

****Occurs in older birds via inhalation of ''E. coli'' in dust; respiratory infection spreads to the blood to cause acute colisepticaemia

****Airsacculitis, pericarditis and perihepatitis during acute phase

****Airsacculitis, pericarditis and perihepatitis during acute phase

****Often secondary to virus or [[Mycoplasmas|''mycoplasma'']] infection or environmental stress

****Often secondary to virus or [[:Category:Mycoplasmas|''mycoplasma'']] infection or environmental stress

**'''Colisepticaemia''':

**'''Colisepticaemia''':

***Systemic disease in young calves, piglets, foals, lambs

***Systemic disease in young calves, piglets, foals, lambs