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Number of influenza H3N2 isolates and influenza-certified deaths, U.S., 2002 to 2004. Upper panel: Number of monthly H3N2 (and proportional unsubtyped) isolates (blue, left y-axis) and influenza-certified deaths (pink, right y-axis) during influenza seasons 2002/03 and 2003/04. Lower panel: Proportion of monthly H3N3 pos. specimens (blue, left y-axis) and influenza-certified deaths (pink, right y-axis).
