2 and 6 days), then general depression, dullness, anorexia, stiffness, ataxia, hyperesthesia, aggression, excitability, continuous chewing movements, aimless wandering, somnolence
[vetstream.com]
[…] rare cases, WEEV infection may cause encephalitis or encephalomyelitis, resulting in neck stiffness, confusion, visual disturbances, photophobia, tonic-clonic seizures, somnolence
[msdsonline.com]
The initial clinical signs of EEE in affected horses caninclude any of the following: biphasic fever, anorexia, somnolence, head pressing, stiff neck, and proprio-ceptive
[addl.purdue.edu]