I could be dealing with different issues this season. I still have not ruled out suffocation causes on 5 hives. 4 dead and one queenless but raising brood from a healthy hive with no symptoms of efb showing up. I would like to repopulate that comb but will test that water very cautiously.
Question; will the test kits detect EFB on material such as pollen or honey or does it have to be from diseased larvae? There was not one speck of brood open or capped from the hives that perished this past winter.