West Nile virus is transmitted by infected mosquitoes, which become infected by feeding on the blood of birds carrying the virus. It is transmitted to humans by the bite of an infected mosquito, and in severe cases it can cause meningitis or encephalitis.
West Nile virus is transmitted by infected mosquitoes, which become infected by feeding on the blood of birds carrying the virus. It is transmitted to humans by the bite of an infected mosquito, and in severe cases it can cause meningitis or encephalitis.