This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page. Embed Code Restart Playing WATCH MORE VIDEOS FROM THIS EPISODE > Dr. Joseph Bresee, M.D. of the Centers for Disease Control and Prevention explains the difference between the H1N1 virus and the newest strain of swine flu, the H3N2 variant virus. ShareTweet