>
> >Myself and others had big problems with NC a few
> years back and the situation only seemed to improve when bees were shook
> swarmed on new foundation, deadout comb was treated with a mist Clorox
> solution and in about half the cases depopulation was the best solution *in
> my opinion*.


The above sound like they might well be effective intervention.   So my
question to you then is, and then what?  Did N ceranae then build back up
again in subsequent years and become a problem again?  If not, why not?
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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