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Equine encephalitis (EE) is an acute, highly fatal contagious disease that presents as two forms--eastern equine encephalitis (EEE) and western equine encephalitis (WEE). The virus can infect birds, mammals (especially horses), and people. Both forms of the disease result in similar clinical signs, such as loss of appetite, paralysis, and staggering. Birds that survive the disease often recover blind or paralyzed.
EE virus is transmitted primarily by infected mosquitoes. Birds (most significantly pheasants) act as a reservoir of the virus.
Supportive care: Isolate the bird from the flock and place in a safe, comfortable, warm location (your own chicken "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.