A 3rd tuberculosis case at Archbishop Riordan High School in San Francisco identified

Kelsi Thorud reports on tuberculosis cases at a San Francisco high school. Website: http://kpix.com/ YouTube: http://www.youtube.com/CBSSanFrancisco Facebook: https://www.facebook.com/CBSSanFrancisco Instagram: https://www.instagram.com/kpixtv/ Twitter: https://twitter.com/KPIXtv