Early detection of A/California/7/2004-like A(H3N2) strains in Norway during the 2004-2005 season, and emergence of a novel H3N2 genetic sub-variant toward the end.

Abstract excerpt

Influenza activity in Norway during the 2004-2005 season was unusually slow in its development despite the early occurrence of an influenza A(H3N2) drift variant. Analysis of initial import and domestic cases in August-November gave early warning of a novel influenza A(H3N2) antigenic variant that had drifted further than the Southern Hemisphere A/Wellington/1/2004-like strains, and this novel variant,...

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