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Reveals higher virulence of IHNV genotype U in rainbow trout, indicating a significant outbreak in Finland.
• IHNV was detected for the first time in Finland in 2017. • IHNV was only detected in rainbow trout in the outbreak in Finland in 2017–2018. • Whole genome sequencing revealed that the outbreak was caused by IHNV genotype U. • Closely related isolates supported a single introduction of IHNV into the country. • In infection trials the 2018 isolate had higher virulence than the 2017 isolate.
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Kantala et al. (2026) studied this question.
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