Another reason to watch both the country of origin and also whether your salmon is wild caught or farm raised.
Virus Strikes Chile's Salmon Farms

Farm raised salmon also contain lower amounts of omega3 fatty acids and Vitamins A and D because they are grain fed. Red dye is added to farm raised salmon too, to make it look more like wild caught.

Wild caught salmon and other fish have declined because of overfishing, which, in turn, has led to more commercial salmon farms which pollute the waters they are in and lead to the spread of disease.

Wild caught is more expensive, but worth it if you're going to eat salmon.