 And Dr. Anastasi says it's also important not only to hydrate after the activity, but also before and during. West Nile virus has been found in a group of mosquitoes in Grand Forks. Grand Forks Public Health is now urging people to be extra careful to avoid getting bitten. Some ways to reduce your risk of mosquito bites includes using bug spray that contains DEET, limiting outdoor activities when it's dark outside, and wearing long-sleeved clothing.