At least you are aware of "WHERE" they come from.
Thanks for noticing.....
I know you are picking up this argument from the pro-feedlot boys. Suggesting that because it's always been there in the wild fish and then implying it's the fault of the wild fish is just a ridiculous argument. If the feedlots weren't there we wouldn't even be talking about the problem..... In the wild it's dealt with under the survival of the fittest law. Sick fish or dead fish quickly get eliminated by something higher in the food chain.
The problem with the feedlots is that they become a concentrated cesspool for the virus and just by the shear concentration have the potential of escalating the problem for the wild fish. I could care less if all of the Atlantics die from it, I care of the effect 100's of contaminated feedlots will have on the wild salmon. And then there is the risk of the virus mutating.... which is a problem that can't even be defined.