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I read something recently that colony collapse disorder was due to viruses transmitted by varroa mites and/or pesticides

Yes, and the mites (Varroa Destructor) found in the collapsed colonies were resistant to miticides.

While widespread antibiotic use is bad for bees it's nothing compared to what the viruses transmitted by the mites do to them.

Agreed. I mentioned this as a reason why antibiotics are not a solution. Antibiotics do not treat viruses.