Mutations in the virus mean that last year's vaccine probably won't protect against this year's flu variety.

VOA: standard.2010.07.21

I didn't have the flu at the time but I became violently ill.

我那会并没得流感，但却病的很重。

耶鲁公开课 - 心理学导论课程节选

If you log on to Zazzle you can order a mug,t-shirt, even a tie promoting swine flu parties and their offer of a free H1N1 virus.

VOA: standard.2009.12.18