Risk Factors Associated With Outbreaks of Infectious Salmon Anemia (ISA) With Unknown Source of Infection in Norway.

Front Vet Sci · 2018 · PMC6292176 · PMID 30574509

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a decreasing trendno p-value reported

However, the annual number of IPN outbreaks (including both freshwater and seawater environment) shows a decreasing trend over the last years, probably connected to widespread use of IPN-resistant salmon strains and a targeted effort to eradicate “house strains” of the IPN virus in hatcheries (unpublished work).

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