Here is the more detailed description of the work that underpins the approval:
Pollination services to increase crop production are becoming more and more important, as we are facing both climate change and a growing world population. B...
www.frontiersin.org
"The data presented here indicate that infection with AFB can be decreased by about 30–50% in the laboratory conditions after vaccination of the queens."
I'm not competent to comment on the methodology, apart from saying that the "challenge" of the larvae seems possibly suspect to me, at least as far as mimicing the real transfer of larval food, etc.
But the *best* I could see it doing might be to ever so slightly slow the inexorable spread of the AFB? 30-50% reduction in infected larvae is still going to leave many in the colony.
And I note the need for veterinarian involvement in the approval.
Nick Wallingford
Tauranga