BrokenWing Chronicles
PDD

This is very deadly, no cure.
The more I read about this disease, the sadness is overwhelming.
If you have multiple birds as we do, PLEASE, Please follow a very simple rule, if you see your bird fluffed, if your bird is acting strange, then there’s something wrong, the first thing to do is, (isolate the bird) immediately.
Second, take your bird to a VET preferable a Certified Avian Vet, but contact a vet right away.

http://www.vet.uga.edu/IVCVM/1998/gregory/gregory.htm

http://www.stoppdd.org/problem/pdd_faq.html

http://www.mit.edu:8001/people/rei/birds-pdd.html

http://www.geocities.com/Heartland/Cliffs/6483/PDD.html

http://www.netpets.org/birds/healthspa/vet/pdd2.html