Deadly and contagious frog dermatitis

[RETFgirl]

I am a somewhat newbie to breeding red eyed tree frogs. I met a RETF breeder on this forum and proceeded to meet him at a reptile show to buy his frogs because I was very interested in breeding. I bought 5 that day. 4 from him and 1 from another breeder. I already had 7 adults, 1 juvenile and tadpoles from successfully breeding the 7 I already had. This put my collection to 12 adults(6M6F) a juvenile + tads. I was already treating my collection for parasites in sterilite tubs and I decided to treat the new ones too because I was building a new 134 gallon viv and didn't want to risk parasite contamination.
One of the frogs I purchased had a small reddish black spot on the hind leg on the day of purchase but I figured it to be some kind of scar. It did not appear to be sick and I trusted this breeder to not sell me a sick frog. After treating each frog with a single syringe for parasites, not keeping every single frog in its own tub (MY BIGGEST MISTAKE) and not hand washing after cleaning all 6 quarantine tubs each day I inadvertently spread a form of frog dermatitis to my entire collection. The male with the spot got another and another and 3 days later he was dying. I contacted Dr. Frye and immediately started silver sulfadiazine and switched from metronidazole to Baytril. Sure enough within a week one by one frogs were getting spots and they were not responding at all to treatment. Some got them on their mouths, some on their toe pads, all on the belly and on the flanks. They resembled cold sores on the body but the feet looked more like painful red growths that would hemorrhage and they spread daily on the body like wildfire. the males were hit the worst and the fastest. I just started euthanizing all of them not responding to treatment with Orajel. They were in horrendous pain I have only one that cleared up quickly with treatment, a large female, and she is still in quarantine but is thriving. 3 of the 4 frogs I purchased of his died, along with 4 others from my collection. 7 dead, 4 never came down with any symptoms. I discussed it with the breeder and he felt that since they were wild caught, the one frog could have been a carrier and the sickness took over after the stress from the show.

SOOOOOOOO.... my question is... has anyone ever dealt with this illness before? Were there any survivors? (I heard their NEVER is) and would putting the female who overcame the disease back with the others be too great of a risk? could future frogs be in jeopardy? I have 1 captive bred juvenile, and 6 of my own captive bred froglets. Could they ever go in the viv with the others pr breed with the ones who never came down with the illness?
Advice please