Technically this is not an emergency or a disease, but does relate to chicken health...
Monday morning our whole property (including the house and all outbuildings) were put underwater in a flash flood. Got the laying flock out just in time to the only place not feet underwater--the road. I have a portable coop, so they were sheltered from the rain at least. After the rain stopped and the water began to recede they walked up and down the road wading happily and picking crawfish, and earthworms out of the nasty floodwaters (neighbors septic tank contents, raw cow manure, etc.) We were so busy dealing with the shock--and the house we didn't pay much attention to what the flock was up to.
Several days later they're back in the yard and appear to be healthy, and are laying just as much as ever. I have 3 questions:
1. Are their eggs safe to eat and sell?
2. Are there any particular concerns I should have in dealing with chickens exposed to toxic water?
3. Is there any supplement or medicine I should be giving them? I am already giving them probiotics in their water.