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Antigenic and Genetic Evolution of Swine Influenza A (H3N2) Viruses in Europe

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Figure

TABLE 1. HI titrations with postinfection ferret antisera against influenza A(H3N2) virus isolates of swine and human origin
FIG. 1. Phylogenetic tree for HA1 of swine influenza A(H3N2) viruses and human reference strains
FIG. 2. Antigenic and genetic maps of swine and human H3N2 viruses. The relative positions of strains (colored spheres) and antisera (notshown) in the maps were computed such that the distances between strains and antisera in the map represent the corresponding HI measurements
TABLE 3. HI test titers of pig antisera collected 4 weeks aftervaccination with a commercial A/Port Chalmers/1/73 vaccinea

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