August 20, 2012 6:12 pm West Nile Still a Mysterious Ailment Scientists remain unclear as to why 80 percent of those with West Nile Virus never show any symptoms while others get very sick. Nesita Kwan reports. Local 2:17 Misconceptions persist around plant-based eating 2:27 Mental Health Monday: Experts offer tips to manage financial stress 2:14 Non-profits, health systems team up to address gaps in care, social services on Chicago's West Side 2:11 Mental Health Monday: Kids using social media to self-diagnose mental health conditions, survey says 2:01 Chicago measles outbreak spreads as case count surpasses 50