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.
Influenza has a rapid onset and pronounced symptoms. After the influenza virus invades a personâs body, an incubation period of one to two days passes before symptoms appear. For most people flu symptoms begin to subside after two to three days and disappear in seven to ten days. However, symptoms like coughing and fatigue may persist for two or more weeks.