The video describes contact tracing, a method used by CDC and partners to identify new Ebola cases quickly and isolate patients as soon as they show symptoms, preventing spread to others. The video demonstrates how even one missed contact can keep Ebola spreading and that careful tracing of contacts and isolating new cases can stop the outbreak. Comments on this video are allowed in accordance with our comment policy: http://www.cdc.gov/SocialMedia/Tools/CommentPolicy.html This video can also be viewed at http://streaming.cdc.gov/vod.php?id=015e042fe3cfc7d71c16c5954fa7c62520141015122157578