The AVMA suggests it is a "scare tactic" or rather, the rapid spread of rumor by social networking and the fear-mongering media. Thought I'd share the article in case anyone heard anything about it and wanted to learn more.
http://atwork.avma.org/2012/02/09/n...ains-in-the-news-real-threat-or-scare-tactic/
http://atwork.avma.org/2012/02/09/n...ains-in-the-news-real-threat-or-scare-tactic/