I wouldn't surprised if commercial bees are closely genetically related as farmers try to get the most productive bees. This might leave them vunerable to some pathogen.

I assure you that I'm not doing the bees in as an attempt to increase my companies sales of aphid juice - squeezed fresh from the aphid by our trained ants and twice as good as honey because it goes through two insect stomaches before it gets to you, not just one. Regurgiatated twice for your enjoyment.