In the real world I don't think you'll find salmon that don't have bacteria and viruses (https://www.nature.com/articles/s41598-023-43345-x shows both "good" and "bad" bacteria and certainly many salmon are infected with a range of viruses (not sure if there are any "good" viral infections, but some are not fatal).

Don't forget that salmon and most other deep sea fish are immediately frozen when caught, which not only helps preserve flavor, but eliminates parasites (https://en.wikipedia.org/wiki/Diseases_and_parasites_in_salm...)