This is the reason for testing your birds. Bordetella avium must be cultured in a laboratory because it needs a specific environment inwhich to grow. I have not found a home test as of yet. The body, head, neck, back, etc. turns a pasty pale color. The top of the head begins to flatten.
Dehydration quickly becomes apparent.
Upper respiratory infection. Sneezing with mucoid exudates. Lethargy becomes apparent. Constant begging for food. The eyes pertrude and are almost always closed.