Outbreaks of avian influenza in the Rostock district highlight the constant risk of infection

09/09/2025 - Last week's two outbreaks of avian influenza in Mecklenburg-Western Pomerania, and the outbreak among laying hens in Schleswig-Holstein at the beginning of the month, show that there is a constant risk of highly pathogenic avian influenza viruses of the H5N1 subtype entering poultry farms from the wild bird population. Although the risk of introduction is currently considered low (Friedrich Loeffler Institute risk assessment dated 9 September 2025), free-range farms remain particularly at risk as direct or indirect contact with wild birds is difficult to avoid there. Over the summer, there were only sporadic cases of the H5N1 avian influenza subtype in wild birds in Germany. However, the outbreaks in the Rostock district and in Schleswig-Holstein show that vigilance must not be relaxed. The effectiveness of biosecurity measures should therefore be regularly reviewed in flocks. This is particularly important as bird migration is expected to result in a higher density of wild birds in certain regions. It is also crucial to monitor for signs of avian influenza virus infection to detect and contain outbreaks at an early stage.