This researcher spoke at the MN Hobby Beekeepers meeting a couple months ago. His results are intriguing. Is this new found bacteria the cause of the demise of bee colonies? Is Varroa the vector that brings the bacteria to the bees? Many unanswered questions still exist, but this may be an important discovery.
http://www.kare11.com/news/whats-killing-bees-new-clue-emerges/380743617