I agree both links make for sobering reading....but I wonder do wild bees (eg bumbles) have their own viruses that can be passed the other way, and if so, then surely this isn't a recent thing, after all bees have been here for 200 million years....and so the transmission of chalk, sac brood viruses the other way might not also be a recent development, merely it has just been discovered as an occurrance in the wider hunt to solve the CCD problem ?
I wonder if, like humans, exposure to a virus can then create antibodies in the species discussed (obviously IAPV is pretty fatal), but maybe this cross contamination has been going on forever...
I wonder what the implications are for harvesting pollen for feeding back later in the season...
regards
S