Coordinated One Health investigation and management of outbreaks in humans and animals caused by zoonotic avian influenza viruses.

When investigating and controlling outbreaks caused by zoonotic avian influenza viruses (AIV), a One Health approach is key. However, knowledge-sharing on AIV-specific One Health strategies, tools and action plans remains limited across the EU/EEA. It is crucial to establish responsibilities, capacity requirements, and collaboration mechanisms during 'peace time' to enable timely and effective outbreak investigations and management. This report focuses on five scenarios for outbreak investigation and management of zoonotic AIV at the human-animal-environment interface, emphasising key actions for the stakeholders involved. The document primarily highlights the collaborative framework necessary for interdisciplinary coordinated responses, referring to more detailed guidance and technical reports published elsewhere when applicable. Three scenarios are triggered by suspected outbreaks in animals, including kept animals of listed species, non-listed species, companion animals and wild birds/mammals. The other two scenarios are initiated by a probable human case or detection of the virus in wastewater or environmental samples (e.g. surface water or other sources). All scenarios require cross-sectoral coordination and a One Health approach. While the specific sequence of actions and communication needs may differ across scenarios, the overarching response mechanisms for outbreak investigations and management remain consistent. By presenting each scenario alongside the integrated actions of stakeholders, the report identifies critical development needs, such as tools (e.g. communication and data sharing platforms); key points for information exchange across sectors, triggers for joint risk assessments, and gaps in existing knowledge. The document should assist in developing guidance documents to facilitate coordinated One Health investigations and the management of outbreaks in humans and animals caused by zoonotic avian influenza viruses.