It's cold and flu season.

这是个感冒、流感肆虐的季节。

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To evaluate the risks of infection, the study team flew on 10 different flights in the U. S. during the flu season.

为了评估感染的风险，研究小组于流感季节在美国乘坐了10次不同的航班。

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Winter is the flu season.

冬天是流感季。

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During the last flu season, twelve percent of H1N1 viruses tested in the United States were resistant to Tamiflu.

VOA: special.2009.03.04

In the United States, cases of suspected influenza are at higher numbers than usual this early in the flu season.

VOA: special.2009.11.24

Dr.Redd says and he expects it to be the dominant flu virus in the southern hemisphere in the coming flu season.

VOA: standard.2010.04.29

But during the 2011-2012 flu season, only 47% opted to get vaccinated, according to the CDC.

CNN: Flu vaccine poses no risk to unborn

She attributes this to an earlier start of the flu season and outreach efforts.

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We're in a time in which the normal course of the flu season is winding down.

WHITEHOUSE: Press Briefing