Thanks for the replies it is much appreciated!
>BUT I'm wondering if this one thing, treating with antibiotics somehow
tipped the balance in favour of the varroa. Maybe varroa mites have
bacterial enemies.<
I was watching Diana Samammatero's presentation on beneficial microflora in honey bee colonies and this comment by you came to mind. Looks like it could line up with your thinking in that it may be directly or indirectly related.
http://www.extension.org/pages/ABRC2010_Beneficial_Microflora_in_Honey_Bee_Colonies
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