losing feathers

my budgie is just about bald he has no feathers on his at all about 2 feathers left on his chest now he is losing it on his back what can i do the vet said it was feather mites and i was advised to get a spray for this i did and followed what was to be done but that was 4mths ago he is getting worse

[Aleda M Cheng, D.V.M., C.V.A]

It would be best to take your bird to a vet who specializes in Avian medicine, if available.  Your bird may need a skin biopsy, fecal analysis and blood work to determine the cause of this severe problem.

Causes for feather loss are quite extensive and can include: Skin parasites, Gastrointestinal parasites (giardia, and others), Fungal or bacterial or other microbial skin infections, Atopy (skin allergies), Endocrine disorders, kidney disease, and many many more.