Full Breakdown
H5N1 Avian Influenza Causes First Confirmed Wildlife Die-Off in Antarctica
2/15/2026, 10:56:19 AM
Overview of the H5N1 Outbreak
In a significant development, more than 50 south polar skuas have died in Antarctica due to the highly pathogenic avian influenza virus H5N1 during the summers of 2023 and 2024. This incident marks the first confirmed wildlife die-off linked to the virus on the continent. Skuas, large brown seabirds that inhabit polar and subpolar regions, play a crucial role in their ecosystems as scavengers. Their scavenging behavior may increase their risk of exposure to the virus, facilitating its spread across Antarctica.
Research Expedition and Findings
A research team conducted an expedition in March 2024, shortly after the breeding season for skuas and penguins. They examined wildlife at ten sites across the South Shetland Islands, the northern Weddell Sea, and the Antarctic Peninsula. The team collected tissue and environmental samples and performed necropsies on sick or dead animals. While examining gentoo penguins, Adélie penguins, and Antarctic fur seals, H5N1 was not identified as the cause of death in these species. However, the virus was detected in skuas at three locations: Hope Bay, Devil Island, and Beak Island, with Beak Island experiencing a significant die-off.
Symptoms and Impact of H5N1
The H5N1 virus attacks the brain, leading to severe neurological symptoms in infected birds, including twisted necks and unusual body movements. Infected skuas may exhibit erratic behaviors such as walking or swimming in circles, colliding with objects, or falling from the air. Ralph Vanstreels, a wildlife veterinarian involved in the study, described the situation as a "crisis in animal suffering," emphasizing the profound impact of the virus on these populations.
Global Spread and Human Influence
H5N1 was first identified in 1996 on a domestic goose farm in Southeast China and has since spread globally, affecting wild bird populations across Europe, the Middle East, Africa, North America, and South America before reaching Antarctica by early 2024. The same strain responsible for the skua deaths previously caused significant mortality among elephant seals and sea lions in Argentina. The virus has also led to the deaths of over 400 million poultry worldwide and has infected various mammals, including dairy cows and otters. Thijs Kuiken, a senior author of the study, noted that human activity has played a crucial role in the virus's emergence and spread.
Calls for Increased Surveillance
The arrival of avian influenza in Antarctica adds another layer of threat to wildlife already facing challenges such as climate change, tourism, invasive species, and pollution. The researchers stress the need for enhanced surveillance and monitoring to mitigate the risk of further spread. They highlight the lack of recent population data, as the last census of Antarctic skuas was conducted in the 1980s, estimating about 800 breeding pairs. Without updated figures, assessing the significance of the loss of 50 skuas remains challenging.
Verbatim Quotes
- “We knew there were animals with the infection, but this is the first study to show they died of the viral infection,” — Ralph Vanstreels, Wildlife Veterinarian, UC Davis One Health Institute
- “There, I could really see with my eyes the impact this virus can have on these populations.” — Matteo Iervolino, Ph.D. Candidate, Erasmus MC
- “Everything points toward this virus spreading further,” — Thijs Kuiken, Professor, Erasmus MC
The findings underscore the urgent need for action to monitor and protect Antarctic wildlife from the ongoing threat of H5N1 avian influenza.
