The health department says it's sending one dead bird to the state that's suspected of having the virus.
The Winnebago County Health Department says it has positively identified one mosquito pool as having West Nile virus.
Symptoms of having West Nile virus include a fever, nausea, headache and muscle aches.
According to state health officials the person who died was an adult, but they provided no further details. "We see most cases of West Nile virus from July through November".
Only about 20 percent of people who get infected with West Nile virus suffer any symptoms, though it can be deadly in rare cases. In about 1 percent of infections, West Nile virus can cause a severe illness affecting the central nervous system, such as encephalitis (inflammation of the brain) or meningitis (inflammation of the membranes that surround the brain and spinal cord).
To combat the mounting threat of West Nile virus, aerial insecticide spraying will take place in Elk Grove, the Pocket and neighborhoods south of Fruitridge Road on Monday and Tuesday, the Sacramento-Yolo Mosquito and Vector Control District said Friday.
Use an EPA-registered mosquito repellent and apply according to the manufacturer's instructions.
Officials also recommend wearing long sleeves and trousers as well as using repellent when outdoors.
The announcement comes after news that the city of Sacramento unintentionally heightened the risk of virus transmission in the Pocket by creating bodies of stagnant water ideal for mosquito breeding.
Right now, lab tests in the western part of North Dakota are showing an abundance of mosquitoes carrying West Nile. "We can do this by eliminating opportunities for mosquitoes to breed and multiply, and by taking steps to prevent mosquito bites".