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Birds + Infectious Diseases

  • Aspergillosis is a fungal infection that commonly causes respiratory disease in pet birds. It can cause both upper (nose, sinuses, eye, and trachea) and lower (lungs and air sacs – a specialized part of the respiratory tract that birds have) respiratory problems or more broadly distributed systemic infections. Aspergillus is normally an environmental contaminant and is not contagious from bird to bird.

  • Candida albicans is a common environmental fungus that can affect the digestive tracts of birds. It is a common cause of 'sour crop' or a crop infection (ingluvitis), especially in young birds. Candida can be a primary or secondary cause of crop infections. Often, other diseases compromise the bird's immune system and predispose a bird to secondary Candida infection (candidiasis).

  • The normal lens in the eye of any animal is clear and colorless. A cataract is an increase in the density or opacity of the lens; it is often observed as whiteness within the pupil. Cataracts are often seen in canaries and less often in Amazon Parrots, African Grey Parrots, and Macaws. Cataracts decrease the visual acuity of the bird and may eventually lead to blindness.

  • Chlamydophilosis, also called "psittacosis", chlamydiosis or "Parrot Fever", is a reasonably common disease of birds. It can occur in any bird but is especially common in cockatiels, Amazon parrots and budgerigars (often referred to incorrectly as parakeets.)

  • Crop infections are common in pet birds, especially baby birds that are being hand fed. While not usually fatal if treated early, crop infections can be serious and result in a complete loss of appetite.

  • Feather loss is as much of a concern to bird owners as hair loss is to dog and cat owners. The feathers of a bird provide protection, insulation, flight, and visual signals to other pets.

  • While many owners believe parasites are common causes of skin disorders and feather loss in birds, this is usually not the case. However, Knemidokoptic mange, also called cere mites or scaly face is a relatively common disorder, particularly in some of the smaller species of birds.

  • Pacheco's disease is caused by a herpes virus. Many species of birds are susceptible. Cockatoos and Amazon parrots are very susceptible to the infection and usually die, whereas conures, such as the Nanday and Patagonian Conures seem to be resistant to the disease.

  • The papilloma virus causes non-cancerous tumors (warts) in many pet birds. The virus belongs to the family papovavirus, the same family as the polyoma virus, which also infects birds.

  • The polyomavirus of pet birds belongs to the family Papovavirus, the same group of viruses that causes benign skin tumors (papillomas or warts) in birds. Polyomavirus can cause benign feather lesions in budgies (the so-called French molt or Budgerigar Fledgling disease) or acute death.

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