...We think it may be something like a one-two punch, where something initially weakens the bee initially and a second pathogen takes over and actually kills the bee," said Dr. Jeff Pettis.
Now another scientist at the University of Montana thinks he's confirmed that theory. He says a virus has been isolated in affected hives, along with a bacteria. He believes the two acting together causes colonies to collapse.
The virus and bacteria were isolated at the Army's Edgewood Arsenal's Chemical Biological Center in Harford County...