to have flu

[Saneta]

http://www.english-test.net/toeic/listening/do_we_have_any_more_printer_paper.html

He's got the flu.

In my grammer book there are: to have flu, pneumonia, mumps without 'the'',
so is it a mistake in:He's got the flu.?

Thanks a lot..

[Beeesneees]

There's not mistake. Use of 'the' is common with 'flu'.
The same does not apply to pneumonia or mumps (or most common ailments), though. They would not take the article.
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Cheers m' dears!