A North Valleys resident has tested positive for West Nile Virus, according to the Washoe County Health District. It is the first 2017 human case in Washoe County. Health officials say although the resident had traveled outside Washoe County and may have been exposed elsewhere, the presence of positive mosquito pools locally means a local exposure cannot be ruled out and residents should take appropriate precautions.  Those precautions include proper clothing and repellent outdoors when mosquitoes are active, especially in the early morning and evening. Make sure your doors and windows have tight-fitting screens. Clear and standing water and any items from around homes that can be potential mosquito-breeding grounds, and vaccinate your horses for West Nile.