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Schematic representation of four genotypes in A(H3N2) viruses co‐circulating in 2006–2007 season. Genetic analysis of individual segments revealed that the 2006–2007 belonged to one of four gene constellations. Viruses of genotypes B (blue) and C (orange) are sensitive to adamantanes, whereas viruses in genotypes A (green) and D (purple) are adamantane‐resistant. The N‐lineage viruses are colored in red. Genetic groups are defined based on the HA and NA gene segment phylogenies.
