Re: EFB options
What I did, to be sure my other hives did not rob the infected ones, was harvest all honey for human use only, melt down all wax, scorch all woodware. Terra-pro was easy to get in 2013, and feed sugar water while they had that and redid their hive, thus expelling the remaining bactera. Same reason we put fresh swarms on sugar water and foundation, so they'll get rid of anything they are carrying.
Any hive that robbed yours will also need treated.
Stuck in Texas. Learning Permaculture in drought, flood and strange weather. The bees are still alive.