The Norwegian dogs that have died have had diarrhea and vomiting and a rapidly deteriorating general condition. The Norwegian Food Safety Authority and the Veterinary Institute are now investigating the infection. At present, there are no reports of affected dogs in Sweden and no restrictions from any authority to travel to Norway.

- It is important that you as a dog owner are informed. But it doesn't have to be alarming - you can use common sense, says Holly Cedervind, a county veterinarian in Värmland.

According to the Norwegian Food Agency, there are no indications that humans or other animal species have been affected by the infection.