Severe depression, collapse, and bruising under the skin my be the only signs noticeable. In some instances no signs at all are noticeable prior to death. Once showing signs, almost all birds progress to death irregardless of treatment. The incidence of Polyoma disease has remained common in hand-raised babies. There is no cure and very little if any symptoms with this disease.
Testing is available, but only as a screening test and of little value in nestling birds.
Vaccination at this time offers the only safeguard for your pet. If you have any questions about vaccinating your bird, Please feel free to ask.