According to the Centers for Diseast Control and Prevention (CDC) you can protect yourself from mosquito bites by:
Help reduce the number of mosquitoes in areas outdoors where you work or play, by draining sources of standing water. In this way, you reduce the number of places mosquitoes can lay their eggs and breed.
Note: Vitamin B and "ultrasonic" devices are NOT effective in preventing mosquito bites.
You can contact your local health department for the latest information on the virus in your area. Its also a good idea to take steps to lower your risk of getting a mosquito bite:
A West Nile virus vaccine is available for horses only. If you own horses, you may think about getting the vaccine for them. The death rate from West Nile is much higher in horses than in humans.
Researchers are working to create a vaccine that prevents West Nile virus in humans.