Following an incubation period of 7-21days, an initial pyrexia and mild depression are short-lived and often missed. The acute phase of the disease presents with mild to severe pyrexia, anorexia and stiffness, lasting up to 5 days. During this time, the horse is viraemic and capable of amplifying the disease. The fever may then fluctuate with neurological derangements appearing a few days post-infection. These changes indicate disease progression, which occurs more frequently with EEE. Any of the following may be observed:
+
Following an incubation period of 7-21days, an initial pyrexia and mild depression are short-lived and often missed. The acute phase of the disease presents with mild to severe pyrexia, anorexia and stiffness, lasting up to 5 days. During this time, the horse is viraemic and capable of amplifying the disease. The fever may then fluctuate with neurological derangements appearing a few days post-infection. These changes indicate disease progression, which occurs more frequently with EEE (the most virulent of the three serotypes). Any of the following may be observed: