First, keep in mind that only a small percentage of people – about 5% of those bitten by a EEE-infected mosquito – go on to develop encephalitis. Most people who are bitten by an EEE-infected mosquito have no symptoms or only have mild, flu-like symptoms. However, if you or your loved one suddenly develop symptoms of EEE, call your doctor right away. Your doctor will further evaluate your symptoms, order blood or spinal fluid testing (if necessary) and decide on the need for additional medical care.