I believe the dosage of the duramycin-10 is one tablespoon per gallon of water, remix a fresh batch daily. But that's just from memory, so maybe someone else can jump in with that info. There is an egg withdrawal so I'd isolate him if possible with his own waterer. And you also don't want to dose the chickens who are not ill with any anitbiotics. Do you have a dog crate? That's something you can place him in. When did you first notice he was losing weight?
This is one of the things we use for chickens needing to be isolated. We place this one in the run so they can be with everyone. We also have an "isolation" box in the basement in case they need closer monitoring.

And you asked earlier about performing a chicken exam & I found this link with some general info: http://ohioline.osu.edu/vme-fact/0020.html
This is one of the things we use for chickens needing to be isolated. We place this one in the run so they can be with everyone. We also have an "isolation" box in the basement in case they need closer monitoring.
And you asked earlier about performing a chicken exam & I found this link with some general info: http://ohioline.osu.edu/vme-fact/0020.html