Alabama's Mobile County is confirming its twelfth case of West Nile virus. The county's health department reported its first case was reported in August. The health department says mosquito activity peaks at dusk and dawn. Officials said the best ways to prevent bites are to wear long pants and shirts, use repellent, and avoid standing water. Humans with the virus or other mosquito-borne diseases often have symptoms of high fever, severe headache, nausea, stiff neck, confusion, muscle weakness, paralysis, disorientation, and seizures. In rare cases, the virus can cause coma or death.