I wanted to post on this thread one last time and then shut up about it, unless I have a report back from a Lab.
To all that have chick problems, I believe we need to get experts involved here. If ours start acting up more in this second group of 50, I am going to take some down to the University Lab for analysis. As we have all experienced, this isn't a routine issue or the obvious.
I think I am starting to see some signs in this second group, but I will watch them for a few more days. In the first group, the breeds that weren't affected originally, still aren't and they are doing very well. Of 115 in 11 breeds, we have 28 sick/recovered/dead in just 5 breeds, with a major concentration on just 4 breeds (10/12 cuckoo marans, 6/7 buff rocks, 5/8 EEs, and 6/7 partridge cochins.) Not affected so far are 12 andalusians, 1 free chick (I think it is a White Faced Black Spanish female), 11 Red Stars, 7 Australorps, 7 white rocks, 28 bantam EEs, and 7 RIRs.
I don't think any of our chicks have all or even most of the symptoms described in these new diseases. Ours do NOT huddle near the heat source and do not have paralysis. These chicks were vigorous for the first 12 days. If something isn't eating or drinking, you would see signs long before the first 12 days were up. Chicks are usually gone within hours of seeing signs. As stormhorse23 said, if you feed these guys, they will last for quite awhile if they are willing to drink water.
McMurray was very nice to us and replaced everything we lost. Unfortunately, it isn't going to do much good if they just die again.