An adult from Fremont County has become Wyoming's first human case of West Nile virus this year.

The Wyoming Department of Health reported the case Monday.

Most people infected with the virus either don't have symptoms or have minor ones, such as fever, headache, body aches, skin rash and swollen lymph nodes.

A very small number develop a life-threatening illness that includes inflammation of the spinal cord or brain.

Health officials recommend people avoid spending time outdoors during dawn and dusk, wear long-sleeved shirts and pants, drain standing water and use an insect repellent containing DEET to prevent mosquito bites.