We have tried everything to not much luck. You could try an eye dropper of honey in their mouths.
Of 115, I have lost 11 so far and have 17 more in the house. Looks like I will lose quite a few of those eventually too, but some are rallying. What they do is start acting weak, like they can't balance and you will see them sleep a lot and use their wings to balance when they do try walk. Then they get "bobble head" acting, with their heads shaking uncontrollably. They they will quit eating. Eventually they quit drinking and die.
I am hand feeding mine. Have been for almost a month now. Whatever this is, seemed to happen at MM. I don't know if they got chilled there, or they were exposed to some chemical, or if it is the vaccines or what.
On my replacements, I changed EVERYTHING. They are in the house, different company for pine bedding, I am feeding these Purina Start and Grow, etc. I lost 1 Blue Cochin right away, and have 1 weak Cuckoo Marans that I am keeping alive. Well, two days ago, for no reason, another Cuckoo Marans has become weak with the wing flapping, etc. There is absolutely NOTHING wrong with their environment. They are in a house that is humidity/temperature controlled and is less than 6 months old. They have new feeders, new brooder, vitamins in the water, good heat lamp temps, etc. A completely ideal situation. We will see if any more are affected, but it is starting to go the same way it was before. I haven't called MM yet, these are about 12 days old. The breeds that weren't affected in the beginning are doing very well from the original order. I will let everyone know what happens with this second bunch, but I am about exhausted from trying to care for these birds. I have never seen anything like it.