West Nile Virus (cont.)

When to Seek Medical Care

West Nile virus is transmitted only by mosquitoes during summer months and generally only appears between the months of May to October.

• People who experience signs or symptoms of serious illness, and have been bitten by a mosquito in the geographic area where West Nile virus is known to appear, should see their doctor immediately.

• Most people with mild symptoms of low-grade fever and muscle aches do not have West Nile virus and will not require specific diagnostic testing.

Anyone who has symptoms of severe illness such as mental status changes, high fever, neck stiffness, sensitivity to light, or confusion should go to the hospital's emergency department immediately. The West Nile encephalitis that occurred during the initial New York outbreak was especially notable for its severe muscle weakness. This is another important warning symptom.