但是，研究者说，令人困惑的是，在季节性流感的重症病例中，肥胖并不突出表现为一个风险因素。

But what's baffling, say the study's authors, is that obesity does not stand out as a risk factor in severe cases of seasonal influenza.

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在季节性流感和以前的一些大流行病当中，怀孕已经是一个尽人皆知的风险因素了。

Pregnancy is already a well-documented risk factor in seasonal influenza and in previous pandemics.

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幼儿、老年人和慢性病患者通常是每年一度的季节性流感病死和严重并发症的最高风险群体2。

The very young, the elderly and persons with chronic medical conditions typically face the highest risks of death and serious complications from annual seasonal influenza.

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