Update: Eastern Equine Encephalitis Rreported in Michigan Horses

• Transmission of EEE is by infected mosquitoes.
• Birds can serve as a host after having been bitten by an infected mosquito.   
• The virus spreads through the body and attacks the central nervous system (brain and spinal cord).
• All horses are at risk. However, younger horses (six months to two years of age) are more vulnerable. 
• The virus is not spread by direct contact between horses.
• Death of horses infected with EEE is relatively high (80 percent or more of cases)  

• Vaccinate your horse(s) for EEE! This is ultimately the most important step to prevention. Vaccination typically provides protection for six to nine months. Your veterinarian will be your best resource for determining vaccination schedules for your respective area. 
• Keep horses indoors around dawn and dusk when mosquitoes are most active.
• Remove sources of standing water in your pasture and around the barn.
• Use fly masks, fly sheets and/or fly leggings when horses are on pasture.
• Spray horses with insect repellent.
• Utilize fans or open windows to create a breeze in the barn for stalled animals . 

• High fever (temperature higher than 103 F)
• Depression and lack of appetite
• Pressing the head into corners
• Walking around aimlessly, often in circles
• Blindness
• Uncoordinated gait, staggering
• Recumbency, unable to get up
• Seizures
• Death  

Source: msu.edu