To protect yourself, make sure you get enough sleep, drink sufficient amounts of water, and eat well.
There are also simple common-sense things you can do to protect yourself from the flu:
Keep your distance, if possible, from people who have the flu, because the virus is spread when someone who has the flu coughs or sneezes.
Wash your hands frequently to reduce your risk of catching a cold or flu; ordinary soap is sufficient. Antibacterial soaps add little protection, particularly against viruses. In fact, a recent study suggests that common liquid dishwashing soaps are up to 100 times more effective than antibacterial soaps in killing respiratory syncytial virus (RSV), which is known to cause pneumonia.
Avoid second-hand cigarette smoke, and if you smoke, try to quit.
Try to maintain a healthy lifestyle to build your immunity by following a nutritious diet, getting enough sleep, drinking lots of water and keeping stress levels low. Eating fresh, dark-colored fruits and vegetables, which are rich in antioxidants and other important food chemicals, may help boost the immune system.