Avian Influenza (AI) - Emergence - Your Guide to Transboundary & Emerging Diseases
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Total Reported Outbreaks
Total Affected Countries
Total Affected Species
Key Facts
Clinical Signs
Treatment and Management
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Avian influenza is a notifiable viral disease that significantly impacts poultry health and welfare, farmer livelihoods, and trade. Biosecurity and management pose a huge challenge due to the wild bird reservoir and in cases of epidemics.

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Avian Influenza (AI)

This disease is prevalent in many parts of the world. Find out where the latest reported outbreaks are with this map.

Key Facts
Clinical Signs

As there are different types of the avian influenza virus, so the clinical presentation of the disease may vary. LPAI is associated with few or no clinical signs whereas HPAI is highly contagious and can cause severe clinical signs and high mortality. Clinical signs in poultry may range from mild respiratory signs, reduced egg production and immunosuppression with LPAI, to severe respiratory signs, sudden drop in egg production and up to 100% mortality with HPAI. Other signs may be seen.


Treatment is not an option given the rapid spread and high mortality of HPAI. Preventive measures must be taken to reduce the impact of this disease.


The World Health Organization (WHO) and World Organisation for Animal Health (OIE) work together on international coordination of the control of avian influenza. This includes science-based international guidelines and recommendations, as well as monitoring via the network of reference laboratories. Effective surveillance, including wild birds, is important to increase early disease detection. As with many other diseases, prevention is important and effective biosecurity measures are essential for poultry farms and owners of domestic birds. These focus on keeping the virus out of contact with poultry, and includes good cleaning and disinfection, barriers to prevent contact with wild birds, and controlling the access of people to poultry buildings. In the event of HPAI outbreaks stamping out is a standard tool to eradicate the virus in many areas, whilst vaccination may also be an option.

Hens in a field, that could be at risk of avian influenza
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Focus On… Avian Influenza – a unique challenge
Influenza viruses occur naturally in many wild birds and, periodically, some of these ‘spill over’ into poultry, pigs, and humans. The winter of 2016/17 has seen widespread occurrence of a…
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