Aviaire influenza outbreak

Many outbreaks of aviaire influenza: risk raised to ‘very high’

On Oct. 6, 2025, another outbreak of highly pathogenic avian influenza (HPAI) was detected on a poultry farm in the Netherlands for the first time since March 19, 2025. On Oct. 13, the Animal Disease Expert Group met to prepare a new risk assessment based on this outbreak and available information on outbreaks in other member states in the European Union. The risk of infection for Dutch poultry farms was thereby increased from low-moderate to moderate.

On Oct. 16, based in part on this advice, a nationwide caging and fencing requirement was instituted to reduce the likelihood of outbreaks in kept birds. Since the Oct. 6 outbreak, HPAI has been detected at several locations, both in commercial poultry farms and hobby farms.

A sharp increase in HPAI is also seen in wild birds, particularly in ducklings. These infections in wild birds occur throughout the Netherlands. The rest of Europe is also seeing an increase in outbreaks of HPAI in both domesticated and wild birds.

On Nov. 10, the Animal Disease Expert Group met again for a risk assessment. Based on the high prevalence of HPAI among wild birds and the increasing number of outbreaks in domestic poultry, the risk level was raised from “moderate” to “very high,” with a low level of uncertainty.

Stay alert
Given the current situation, where a large number of infections have been identified in a short period of time, it is crucial to prevent further spread as much as possible. Strict biosecurity and hygiene measures remain the main tool. Always report suspicions immediately to NVWA so that prompt action can be taken.

We also remind you of national measures and the proper application of the fencing requirement for hobby keepers and keepers of special bird species, such as pheasants and ratites. For anyone who comes in contact with wild birds, be aware that wild birds can be infected, especially mallards. Therefore, when handling wild birds or carcasses, it is important to observe the safety and personal protection measures described in the Guideline for Handling Wild Animals with Avian Flu.

Below is an overview of the main sources of information to monitor the current avian influenza situation and to consult relevant information on the measures in place:

• Avian influenza | Rijksoverheid.nl
• GeoWeb
• Avian influenza | NVWA
• AVINED bird flu – Via AVINED up-to-date information on bird flu.
• WAHIS