... and just plain feeling sick. Swine flu may also cause vomiting and diarrhea. These flu symptoms usually last for 3 to 4 days, but cough and tiredness may linger for up to 2 weeks after the fever has gone away. Other family members or close contacts often have a similar illness.

For in-depth information, see WebMD's Children and Flu.

Children and Flu

Some parents think the flu is a stomach bug. But while children may have nausea and/or vomiting with flu, the key influenza symptoms in children include a high fever, chills and shakes, body aches, and a dry hacking cough.

http://www.webmd.com/cold-and-flu/flu-guide/children-and-flu-influenza

I always believed that if you didn't feel sick, you didn't have the flu. And really, i guess i still believe that, although it seems to be wrong. Good clip Merrie, thanks.