I was vaccinated against the flu.

The flu prevented him from playing golf.

Few people die away at the approach of winter.

He came down with the flu.

He's in bed with the flu.

My father is suffering from influenza.

We all caught flu, and so did the teacher.

You're ill with flu.

Can we check the rapid spread of the 'flu?

You are coming down with the flu, or something serious.