The H1N1 virus, better known as swine flu, has made a resurgence this year, killing at epidemic levels since mid-January. And we could still have as many as six weeks of flu season to go.

The most recent data, which extends through Feb. 8, shows over 6,600 lab-confirmed flu cases nationwide, with H1N1 being the predominant strain. During the week of Feb. 2 -- the sixth week of flu season -- the death rate was at 8.4 percent. (To be considered an epidemic, it must be above 7.3 percent.) According to the Centers for Control and Prevention, a rise in flu deaths among young people -- everyone in the middle range between children and the elderly who usually aren't hit as hard -- is largely responsible for swine flue's comeback. A full 60 percent of those hospitalized this year have been between the ages of 18 and 64.

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New research has added fuel to the theory that young people who skipped the flu shot were particularly at risk this year. From the Washington Post: