A concerning surge of avian influenza swept across Europe between September and November of 2025. This outbreak, unlike anything seen before, highlights the constant threat of this virus. Let's dive into the details.
From September 6th to November 28th, 2025, a staggering 2,896 instances of highly pathogenic avian influenza (HPAI) A(H5) were detected. These detections occurred in both domestic ( 442 cases) and wild birds (2,454 cases) across 29 European countries.
The sheer scale and widespread nature of this outbreak were particularly alarming, especially among wild birds. Imagine the impact: large populations of waterfowl were devastated, and mass deaths of common cranes were witnessed along their migratory paths. This widespread circulation in wild birds led to significant environmental contamination. Consequently, most HPAI outbreaks in domestic birds were directly linked to contact with wild birds, emphasizing the critical role of wild bird populations in spreading the virus.
Within the poultry sector, turkeys bore the brunt of the impact. Moreover, outbreaks were also reported in vaccinated ducks. A subtle increase in HPAI virus detections in mammals, including foxes and domestic cats, was observed, mirroring the rise in cases among wild birds.
But here's where it gets controversial... Between September 9th and November 28th, 2025, there were 19 reported cases of human infection with avian influenza viruses, including two fatalities. These cases were spread across four countries: Cambodia (3 A(H5N1) cases, 1 death), China (14 A(H9N2) cases), Mexico (1 A(H5N2) case), and the United States of America (USA) (1 fatal A(H5N5) case). All 5 human cases involving the A(H5) strain had a history of exposure to poultry or poultry environments.
The high prevalence of avian influenza viruses in bird populations elevates the risk of human exposure. However, despite this, human infections remain relatively rare.
No instances of human-to-human transmission were documented during this period. The risk associated with the avian A(H5N1) clade 2.3.4.4b influenza viruses currently circulating in Europe remains low for the general public within the European Union/European Economic Area. It's considered low-to-moderate for individuals with occupational or other forms of exposure to infected animals or contaminated environments.
What do you think? Are you concerned about the spread of avian influenza? Do you think enough is being done to protect both humans and animals? Share your thoughts in the comments below!
