West Nile Virus, an infection most commonly spread to humans by mosquitoes, is spreading in Colorado with 9 new cases reported in Larimer County between August 2 9th. Most people do not show symptoms of infection with only about 1% experiencing severe symptoms. However, of the 12 cases reported, 4 are severe neuroinvasive cases that have led to meningitis, encephalitis, and paralysis. While symptoms can appear within a week, effective interventions are prevented by late diagnosis with infection often not reported until 3-4 weeks after the bite occurs. The best way to prevent West Nile Virus is wearing protective clothing and using insect repellant.