Researchers Detected H5N1 Antibodies in Polar Bears
The finding in East Greenland confirms polar bear exposure to avian influenza as climate change alters regional ecology.
Updated on Oct. 14, 2026 in Environmental
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Researchers detected H5N1 avian influenza antibodies in four polar bears in East Greenland in 2025. The study analyzed plasma samples collected from animals harvested during subsistence hunts to track pathogen exposure.
Why it matters
The findings highlight how climate-driven sea ice loss forces polar bears to spend more time on land, increasing their exposure to terrestrial pathogens. This shift suggests a widening pathway for avian influenza transmission across Arctic mammal populations.
Researchers screened 109 samples, identifying positive signals in 3 of 14 bears in 2024 and 6 of 14 bears in 2025 using ELISA and hemagglutination inhibition assays.
The players
East Greenland Research Team
The group of researchers conducting longitudinal monitoring of Arctic wildlife health through subsistence harvest sampling.
The details
Scientists used enzyme-linked immunosorbent assay (ELISA) — a plate-based technique designed to detect and quantify substances like antibodies — to screen heart blood for H5N1. Confirmed positives were validated using hemagglutination inhibition assays, a standard method that measures the ability of antibodies to prevent viral proteins from binding to red blood cells. The observed bears showed no clinical signs of illness, indicating sub-clinical exposure rather than active infection at the time of sampling.
Timeline
2016-2025: Period for polar bear plasma sample collection.
2024: Three of 14 samples tested positive via ELISA.
2025: Six of 14 samples tested positive via ELISA.
The Tech Race
This study follows a pattern set by Arctic wildlife health monitoring programs, extending regional surveillance to account for changing pathogen circulation in warming climates. It mirrors efforts in regions like Alaska and Svalbard, where scientists are racing to quantify the impact of H5N1 on top-tier Arctic predators.
The findings primarily inform epidemiological models and wildlife management policies regarding the health of Arctic ecosystems. There is currently no immediate risk to the public or change in status for Arctic travelers or subsistence communities.
The takeaway
The study demonstrates that polar bears in East Greenland have been exposed to H5N1 without showing clinical symptoms. Researchers will continue monitoring populations to see if this exposure leads to larger-scale outbreaks in the future.
Further reading
Learn more about the intersection of climate change and shifting ecosystems in our Environmental section.
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Are climate-driven environmental changes creating dangerous new health risks for Arctic wildlife species?
