Where are you located? Bacillary white diarrhea is a term for pullorum or salmonella infection. It is not very common in birds from a hatchery or feed store, but can be possible in backyard flocks. Occasionally, a hatchery might be in the news if there is an outbreak. It is treated with sulfonamide antibiotics, such as sulfadimethoxine and others around the world. I cannot find any vaccines for sale, but here is some reading about vaccines and certain brands: https://www.thepoultrysite.com/focu...salmonella-gallinarum-from-ceva-sante-animale
Well the sick birds are in melbourne fl about 3hr away from me. The person is a repeat customer of mine. I contacted others that got chickens from the same batch all healthy so I don't think it came from me. But it scared me. Its taken me a long time to breed my flock of quality breaded silkies.