Some common bird diseases include:
Extremely underweight birds
Weakness, many birds with this disease are too weak to fly.
Birds with this disease tend to eat constantly, but they do not gain any weight.
There is no cure for this disease, and it almost always results in death. Hexamita is a highly contagious diseases, and even if birds seem to recover from it, they are still carriers.
Psittacine Beak and Feather Diseases:
All birds (mostly come across in parrots, but there has been a magpie lark recorded with this disease). Called 'Runners' in Lorikeets.
Missing feathers, normally flight and tail feathers.
Birds can be underweight because they are unable to fly up and eat.
There is no cure for this highly contagious disease.
Badly underweight birds.
Fluffed up appearance.
Loss of appetite
Discharge from eyes and/or nostrils.
There is no cure for this highly contagious disease. Humans can catch it, resulting in severe respiratory problems. Symptoms in humans include lingering flu symptoms.
Lumps on unfeathered areas, such as the feet, around the eyes, beak etc.
This disease, carried by mosquitoes, can be treated with Betadine. Pox Virus is highly contagious, and once the lumps have cleared up, the bird still remains a carrier.
More bird diseases.