Wasting can be a sign of Mareks or other illnesses. The absolute only way to determine whether a bird has or had Mareks is by autopsy. Vets can not diagnose by symptoms and there is no blood test. They have to examne tissues for tumors.
Try find out who your state vet is by a google search. That vet should be able to guide you provide guidance on where you can get a necropsy. If you dont have any luck, call your regular vet and ask them. If you still can't get any help, the try your local county cooperative extension office and ask for your poultry specialist. Please let us know how you make out.
Best wishes,
Tina
X2
Please let us know what you find out.