Canadian officials never told the public or scientists in the United States about those tests — not even after evidence of the virus discovered in October was treated as an international emergency, according to documents and emails obtained by The Seattle Times.

The researcher's work surfaced only this week after she sought and was denied permission by a Canadian official to try to have her old data published in a scientific journal.

Scientists and wild-fish advocates long have feared the arrival of infectious salmon anemia (ISA) virus, a pathogen linked to aquaculture that has killed millions of farmed salmon in Europe and Chile. They say it could mutate and devastate wild fish stocks.

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