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Illustrated Articles

Infectious Diseases

  • COVID-19 is a disease caused by the coronavirus SARS-CoV-2. Current evidence suggests that person-to-person spread is the main source of infection. While there is evidence of transmission from humans to dogs and cats, it does not appear common. If you suspect that you are ill with COVID-19, you should take the same precautions with your pet as you would with people.

  • Crop infections in birds are not as common as they once were, but are still potentially dangerous in all avian species. Crop infections cause a slowing or stoppage of crop motility, and can be caused by bacteria, yeast and a variety of viruses. Early veterinary attention is essential.

  • Feather loss occurs either because the bird is truly losing feathers or because the bird, or its cage-mate, is picking out its feathers. Feather Destructive Behavior (FDB) is a general classification that describes the many types of damage a bird can do to its own feathers, including feather picking. Feather loss and feather-picking can also be caused by diseases that result in irritation or pain for the bird, or damage to, or inappropriate growth of feathers. Feather loss and feather-picking are complicated problems. For specific advice, your bird should have a thorough work-up by a veterinarian familiar with birds.

  • There are four major infectious diseases seen in pet rabbits: myxomatosis, rabbit hemorrhagic disease (RHD), encephalitozoonosis, and pasteurellosis. This handout discusses the causes, signs, and treatments for these diseases. Be sure to have your rabbit checked annually by a veterinarian to keep them as healthy as possible and minimize problems.

  • Knemidocoptes is a type of bird mite that typically effects canaries, cockatiels and parakeets. It is commonly referred to as scaly face and leg disease. Specific antiparasitic drugs will be prescribed by a veterinarian to treat this disease.

  • Pacheco's disease is caused by an avian herpesvirus. It is often a fatal disease, but treatment with an anti-herpes medication may be life-saving if used at first presentation. This disease is seen less often in today's pet bird population since most parrots are domestically raised and not imported.

  • 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.

  • Avian polyomavirus infection (APV) can cause benign feather lesions in budgies, slow crop emptying in newly weaned parrots, hemorrhages on the skin, or acute death. Clinical signs, diagnostic testing, and preventive measures are explained in this handout.

  • Poxviruses can infect many species of birds, and each species of bird may have its own unique species of poxvirus. This handout explains three forms of the virus: cutaneous, diphtheroid, and septicaemic. Each of these forms has distinct clinical signs. Diagnosis, treatment, and ways to minimize the risk of infection in your bird are explained.

  • Psittacine beak and feather disease (PBFD) is a serious condition in parrot species for which there is no cure. The highly contagious virus attacks fast-growing epithelial cells, commonly causing visibly abnormal formations of the beak and/or feather follicles. The clinical signs vary depending on the species of bird and the age at which it was infected. Diagnostic testing is available and precautions must be taken when purchasing a new bird.