impact of spores on evolution

[Dr. David Faguy]

My impression of this story is that Cano and co-workers
specifically selected the bee/Bacillus pair to study because their 
evolution is restricted. That is, they 'co-evolve'. Cano et al expected 
(or maybe hoped) that the Bacillus strain in this species of bee (even 
though 25 My old or so) should be similar to the Bacillus strain in the 
modern descent of that bee.
David