Sorry but you can not bleach a bird so i ain't goingLOL to many things that a bird can carry and seem just fine , i will remain a chicken
The quarantine pen was for the bird, the bleach was for the shoes silly!
In all seriousness, we have cocci and capillaria in our ground here, Kathy has Blackhead in her soil, KKB has cocci and round worms in his, we all have something... as do probably all Peafowl breeders. The key is learning to treat what may show up, I doubt you are any more likely to pick up a bird with one of these diseases from an auction than you are from a reputable breeder as we cannot cleanse our soil of these things, we can only treat the birds and keep them alive long enough to develop a resistance. I know your flock is very young, but eventually you will need to bring in some new blood, so you will need to risk it sooner or later.