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How to spot signs of bacterial infection in parrots 
Look for changes in your bird's appearance. 
Chlamydiosis can cause loss of appetite which can lead to weight loss. A parrot with chlamydiosis may also have ruffled feathers and in general may appear unkempt.
Symptoms such as weight loss or ruffled feathers can signal a variety of illnesses. If your bird has these symptoms, however, you should get it checked out by a veterinarian.