Signs : biphasic fever (38-41°C, 2 and 6 days), then general depression, dullness, anorexia, stiffness, ataxia, hyperesthesia, aggression, excitability, continuous chewing
[vetstream.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]