The UBC study actually has different findings than debunking claims by anti-salmon farming advocates:
here is another summary not from a Salmon farming PR mouthpiece:
https://www.sciencedaily.com/releases/2021/05/210526150216.htm"Both our genomic and epidemiological methods independently came to the same conclusion, that salmon farms act as a source and amplifier of PRV transmission," said Dr. Gideon Mordecai, a viral ecologist and Liber Ero fellow with UBC Science and researcher with UBC Medicine, who led the study. "Because separate lines of independent evidence all point to the same answer, we're confident in our finding."
Sequencing of 86 PRV genomes helped researchers track the history of PRV emergence in British Columbia. They estimate that the lineage of PRV in the North East Pacific diverged from PRV in the Atlantic Ocean approximately 30 years ago. This suggests that the introduction of PRV to B.C. and infection of wild Pacific salmon is a relatively recent phenomenon, coincident with the growth of salmon aquaculture in the province -- not dating back to early attempts to introduce Atlantic salmon to the region, starting in 1874.
...
Our finding that PRV is transmitted between farmed and wild salmon is particularly relevant given recent field and laboratory studies showing the lineage of PRV in B.C. is likely to cause disease in both Pacific and Atlantic salmon" says Dr. Mordecai. A recent Norwegian study found that a Canadian isolate of the virus causes heart lesions in Atlantic salmon. More importantly to the Pacific ecosystem, PRV has been associated with a different disease in Chinook salmon in which blood cells rupture, leading to kidney and liver damage. These are in contrast to the DFO's assessment that PRV is not a disease agent.
from the State of Alaska Department if fisheries:
https://www.adfg.alaska.gov/static/species/disease/pdfs/fishdiseases/piscine_orthoreovirus.pdfPRV is reported from Norway,Denmark, Ireland, Chile, Japan and the Pacific Northwest (WA, AK, BC, Canada) infecting Atlantic salmon, Pacific
salmon and trout (cutthroat, steelhead,sea-run brown). In Alaska, PRV was sequenced from three stocks of coho and one stock of Chinook and unconfirmed
in one stock of chum salmon
Troubling that other governments recognize this when ours does not.