It can be found in some animal-based foods in its pre-made form, or found in plants in the form of beta-carotene -- a compound your body digests to form two vitamin A molecules. Yellow and dark green vegetables and fruits are good sources of the carotenes, including beta-carotene.
With the flu, you may feel very weak and fatigued for up to two or three weeks. You'll have muscle aches and periods of chills and sweats as fever comes and goes. You may also have a stuffy or runny nose, headache, and sore throat.
Sudden onset of the symptoms may be felt 24 to 48 hours after being contaminated with the virus. People who have been exposed to the stomach flu virus should take special precautions to try to avoid becoming ill, however there is no surefire way to prevent infection.