In someone who already has MS,
a viral infection such as the flu can trigger a
relapse. There is no proof that flu vaccination (or
any other vaccination) increases the chance of a relapse. In fact, people with
MS may want to consider getting an annual flu shot to avoid infection and any
attacks it may trigger. But there is no evidence that the nasal
spray vaccine is safe for people with MS. If you have MS, talk with your doctor about whether a nasal spray vaccine is right for
A person with primary progressive multiple sclerosis (PPMS) may first seek medical care because of leg weakness or difficulty walking. Those are the most common symptoms of this type of MS.
PPMS steadily worsens after it first develops. Neurological disability will accumulate over time. How fast or to what degree disability develops varies for each person and can't be predicted. And in PPMS -- unlike some other types of MS -- there are no relapses or remissions.
Ten percent to 15% of people with...