Dave,
 
I would think if a swarn had varroa and it was treated that they would make a hive
as good as any.  Is there a point of no return, even for a swarm?
 
Steve
 
> > All the wild swarms I have ever gotten have eventually succumbed to varroa,
> though
> >one that I thought showed promise, was lost due to a drone layer. That one
> >lived a year. Another which lived a year and a half, and was extremely
> >productive during its first year, broke down in late spring to a heavy varroa
> >infestation.