Clinical signs of acute and sub acute grass sickness

The clinical signs of AGS are severe and appear suddenly while they are similar but less severe in SAGS cases.  Recovery from either of these two forms of EGS is invariably not possible. 

This picture shows naso-gastric reflux which is the regurgitation of foul smelling green fluid through the nostrils, an indicator of the acute form of equine grass sickness.  This can occur spontaneously in very severe cases, or more commonly, after passage of a stomach tube through the nostrils as in this case. Volumes of up to 12 litres have been recorded in severe cases.