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Avian Influenza
This disease is caused by the Orthomyxoviridae virus family.
In birds, there are many different strains of this virus. However they can be split into two by how severe the symptoms may appear: HPAI (high pathogenic avian influenza) or LPAI (low pathogenic avian influenza). LPAI has much milder symptoms and lower mortality than HPAI.
HPAI has been known to infect humans and cause severe respiratory illness. Due to this HPAI is a notifiable disease in all species of bird. Should it be suspected then your vet must be report it to the APHA/ government.
Although not notifiable, LPAI should also be investigated as H5 and H7 strains has been known to mutate and become HPAI.
Pigeons are naturally more resistant to the virus and sometimes have no physical manifestation of the disease at all. There is also limited evidence that they can transmit the virus from place to place or bird to bird.
Symptoms
- Nasal discharge.
- Difficulty breathing.
- Swollen eyes/sinus.
- Sudden death.
Diagnostics
- Call the APHA.
- PCR swabs from oropharynx/ trachea and from the cloaca.
- Serology: testing for AI specific antibodies in the blood. However, this is not as accurate as the PCR as pigeons do not seroconvert as readily as chickens.
Treatment
- No treatment available. Nurse the bird through the disease if it is showing symptoms and keep it isolated from others.
- In severe cases euthanasia is the best option.
Prevention
- The virus can enter a loft after infection from contact with other bird species. Reducing the likelihood wild bird can use the same resources as your pigeons will reduce the risk of contracting this and many other diseases.
- For more information on organising bird gatherings and AI visit: https://www.gov.uk/guidance/bird-gatherings-licences