I just received an email that had a link to a scientific research protocol funded by the National Honey Board that is ongoing, and which is seeking participants to test the addition of a specific bacterial species (Parasaccharibacter apium) that is normally found in honeybee larvae gut to determine whether or not the colonies that receive the supplementation are healthier. The preliminary studies the researchers have conducted weren't big enough to state unequivocally that there was a decrease in Nosema disease, but the appearance was that it did seem to improve colony health. They need more observations, and I've signed up. I think that many of the Beesource beeks might be willing to participate and contribute their observations. They are looking for people who have plans on giving supplemental feeding in the fall of 2016, who have 8 colonies (so that 4 could be treated and 4 observed) and who are willing to submit their data on how their treated and untreated hives did after the intervention.
Look at: http://beebacteria.weebly.com/