We received 32 chicks from MMH on 3/3. We live in Missouri. Two died in the first day, presumably due to shipping stress, although one of those two had a problem with the umbilicus and also still had lots of shell stuck to its abdomen. A third one died two days later, but it had bad genetic deformations (no eyes, deaf, strangely shaped beak). That was a pretty unpleasant experience but at least little 'Sunray' had a few days of life and was certainly loved.
After those initial three deaths, all was well and the chicks were growing rapidly and were very healthy. At just over two weeks of age, one of them (Light Brahma) started shaking and her legs gave way. We isolated her and hand fed/watered her. Over the next three days, another Light Brahma and six Speckled Sussex began showing the same symptoms. We isolated them too.
Now, the initial Light Brahma, named 'Carrot' seems to have recovered from the worst part of the illness. She still shakes sometimes (a very fine, tremor type of shake) and is completely unable to walk. She doesn't act sick anymore (no lethargy, has a great appetite, no more diarrhea or dull eyes). I am going to the store tomorrow to buy a toy truck and will attempt to make a harnessed walker to see if we can rehabilitate her legs. It would be much easier to cull her, but after hand feeding her for a week, we just can't give up on her yet. I think her legs have atrophied and there are also probably neurological paths that aren't quite making a connection from brain to leg. We'll see what happens.....
The other Light Brahma 'Big Dog', is doing the best, he can still sort of hobble around if he makes up his mind to, and is eating well. Two of the Speckled Sussex are about to die, barely breathing and not opening eyes anymore. Two of them can still sort of flop over to the food and water and might have a chance at some kind of life, if they can walk again. The last two are a toss-up at this point. I keep the food and water right by them and they eat sometimes. I just don't have time to hand feed and water all of them or else I'd try. It's been difficult enough hand feeding ONE of them, I just couldn't manage to do all eight!
We have breeds that have not been affected, or at least not yet (all came in the same order). Those are Buff Orpingtons, Barred Rocks, Brown Leghorns, Araucanas, and the mystery chick, which we think might be a Blue Andalusian. I have seen some little signs in the Buff Orpingtons, and the Barred Rocks all have diarrhea, but I hope I'm just paranoid and reading too much into it. Time will tell.
Right now I'm giving the healthy chicks Poly-vi-sol in their water, and occasional small treats of chick starter mixed with yogurt. I'm giving the sick chicks poly-vi-sol, terramycin, a bit of sugar in their water and daily yogurt or egg yolk for extra calories.
Good luck everyone!