加利福尼亚的研究组发现，住院的甲型H1N1病人的中值年龄是27岁，比季节性流感患者的中值年龄低很多。

The California research team found that the median age of hospitalized H1N1 patients was 27, much lower than the median age of seasonal-flu sufferers.

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而H1N1病毒在所有方面影响更为年轻的年龄组，他们是最经常受感染、需要住院、需要重症监护以及死亡的患者。

The H1N1 virus affected a younger age group in all categories: those most frequently infected, those requiring hospitalization, those requiring intensive care, and those dying from their infection.

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与季节性流感相比，H1N1病毒在所有方面影响更为年轻的年龄组——他们是最经常受感染、住院、需要重症监护以及死亡的患者。

Compared with seasonal influenza, the H1N1 virus affects a much younger age group in all categories - those most frequently infected, hospitalized, requiring intensive care, and dying.

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