Barbara, I'm SO sorry to hear about your bird!
Please do let us know what they find.
CityChicker, Here's a time-line of events to see if there are any clues to Marek's or any other disease:
September 7 2009 - Appenzellers were hatched. (They lived inside, unexposed to the other chickens for 6 weeks)
Early October - My Araucana bantam, 6 months, unexpectedly died. I unfortunately didn't do a necropsy
Late October - I moved the Appenzellers in with the others (at approximately 6 weeks old), and allowed them to free-range during the day
December 3 - My first Appenzeller Dottie got extremely sick with flaccid wings, neck, and legs (could not stand)
December 6 - The sick Appenzeller made a complete recovery while on Vet-prescribed Sulfa-Trimethaprim
December 8 - Another Araucana Bantam (8 months old at the time) develops the exact same symptoms
December 11 - The Araucana bantam makes a complete recovery. The entire flock was on Corid at the time
December 21 - The second Appenzeller Renee develops the same symptoms but less severe. Vet put the flock on Sulmet, but she did not respond and got worse.
December 26 - Renee went on Chlorotetracycline
December 30 - Renee made a full recovery
January 17 2010 - Appenzeller Dottie starts showing wing droop again
January 18 - She is slightly worse, so Vet puts her on Albon. She does not respond and gets worse.
January 22 - Vet puts her on SulfaTrimethaprim again. She does not respond,
and so begins my BYC post...
Does this give anyone any clues? (Aside from the fact that my Vet over-prescribes antibiotics?*
)
* By the way, I am beginning to doubt that the antibiotics were the reason that any of them recovered, unless it helped with symptoms due to treating a secondary bacterial infection of some sort.