https://www.fda.gov/animal-veterinary/news-events/fda-invest...
Elsethread people are speculating that it might be due to contaminated food. Sweden is in the EU, Norway isn't, and AFAIK the EU doesn't like importing meat and other agricultural products.
And because of certain treaties with the EU they essentially accept most EU regulation in any case.
If this is an infection, we can draw no such conclusions. If it is food, it still doesn't help much – perhaps excluding some food components.
= Is in the digestive, but not in the saliva
Is probably a poison, but not chocolate (And I'm including radiation under the "poison label" also. There aren't many things that can wipe the intestinal flora from an animal and replacing it by species that create ultra-resistent spores).
Other option would be food contaminated by spores of Clostridum, pesticides or whatever, but I guess that would be easy to spot the coincidence of a particular brand and batch of dog food in all affected animals.
Don't be murderously disservant. It's torture for animals to be served with things that fastly kill them. All of those things do.
I'm looking forward to seeing what caused this. Really strange (In my non-expert mind) that it hasn't made its way to Sweden.