The U.S. Centers for Disease Control and Prevention activated its Emergency Operations Center and classified the hantavirus outbreak as a Level 3 emergency, multiple sources told ABC News. -- Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News Digital is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7