If you do get the flu and have MS, get to the doctor ASAP
How else can you protect yourself, on top of the shot? Some of the most effective methods are actually the most simple. Shin says, "wash your hands frequently, preferably with soap and water, and avoid other people who are sick." Even if an adult is not showing signs of illness, they may be contagious up to a week before. Children can be contagious for even longer.
If you do feel as if you may have gotten the flu, it is important to visit your doctor as early as possible, preferably within 48 hours of the beginning of your symptoms. This way, treatment can help reduce the length for which you will be affected. Shin says "MS patients can take antiviral medications, if recommended by their health care provider. In fact, one anti-flu medication, amantadine [Symadine and Symmetrel], is often prescribed to MS patients to help with MS-related fatigue."