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.
How long does it take to get the flu? Put in the simplest possible way, the answer is anywhere between 1 to 4 days, and the figures average to 2 days. So, only after almost two days of being handed out the fever by someone else, you would be displaying signs of flu like coughing, high fever, runny nose and body ache.