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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在已知感染人类的所有禽流感病毒中，H5N1造成的重症病例最多，死亡人数也最多。

Of all avian influenza viruses known to infect humans, H5N1 has caused the greatest number of cases of very severe disease and the largest number of deaths.

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