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Vogelgriep in ijsbeer en walrus

19 mei 2026

Op Spitsbergen is een dode ijsbeer gevonden die bleek gestorven te zijn aan de vogelgriep. Dit is de eerste keer dat er een ijsbeer is gevonden in Spitsbergen die overleden is door vogelgriep, type H5N5. Het nieuws werd gebracht door sysselmesteren.no en NRK.no. Fieke Rader gaf ons de tip.

Er was al wel eens een ijsbeer dood gevonden in Alaska, die overleden was aan het vogelgriep type H5N1 (ref).

Voor walrussen op Spitsbergen geldt dat al eerder sterfte was gemeld aan de hand van vogelgriep. Die eten dus niet alleen schelpdieren maar verschalken ook (dode?) vogels.

In de winter van 2021/2022 veroorzaakte de vogelgriep H5N1 massale sterfte onder overwinterende brandganzen in Schotland. Ongeveer 31% van de populatie (11,400 vogels) stierven. (ref). Maar in de daarop volgende zomer op Spitsbergen vonden wij geen sterfte of vogelgriep meer onder de brandganzen (ref). Wij hebben die zomer wel de gevangen en geringde ganzen op griep bemonsterd en bloed afgenomen om ze te testen op specifieke antilichamen in het bloed. De analyse van antilichamen zal binnenkort plaatsvinden in Lelystad, gefinancierd door het nieuwe NWO-project Polar Flu.

Hieronder een deel van de tekst uit sysselmesteren.no, voor het geval die niet blijvend te vinden is.

The Norwegian Veterinary Institute has detected highly pathogenic avian influenza virus (H5N5) in a polar bear and a walrus on Svalbard (19/May/2026)

Last week, the Veterinary Institute received a report of a dead polar bear and a dead walrus, as well as two polar bears with lameness/paralysis in their hind legs, in Raudfjorden north on Spitsbergen. It was tourist guides in the area who first contacted the Norwegian Polar Institute about the observations.

The Governor notified the Norwegian Food Safety Authority, and it was decided that the Veterinary Institute would assist the Governor with field sampling, since rabies and highly pathogenic avian influenza virus could not be ruled out as the cause. The dead polar bear and the dead walrus were quickly found and sampled last Thursday, but no sick polar bears were observed from the air.

This is the first confirmed case of highly pathogenic avian influenza virus (HPAI) in polar bears in Europe. No rabies virus was detected in the polar bear and walrus.

The polar bear was a one-year-old male, while the walrus was an adult. It was clear that the carcasses had been lying around for some time before they were found, but the findings of the highly pathogenic avian influenza virus in the brains of both animals are consistent with this being the most likely cause of death.





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