Laramie, Wy – A horse in Campbell County is Wyoming's only case of West Nile Virus so far, but state officials say residents must still take precautions until mosquito season ends in October. The high temperatures make upcoming August the peak time for it to spread. West Nile Coordinator for the Wyoming Department of Health, Terry Creekmore, compares the current weather conditions to those of 2003 when the state had its worst outbreak with nearly 400 people infected resulting in nine fatalities. However, he says the virus can be prevented.