Can flu vaccine cause or aggravate multiple sclerosis (MS)?
There is no evidence that influenza vaccine causes MS. Recent studies indicate influenza vaccination doesn’t make MS attacks more frequent or make the disease worse. In fact, studies show MS patients who get the flu vaccine have fewer attacks. Can flu vaccine cause paralysis? A form of paralysis called Guillain-Barré syndrome has been associated with vaccination in some flu seasons, but the risk is very small. A study of the 1992-93 and 1993-94 flu seasons in the USA showed about one additional case of Guillain-Barré syndrome occurred in every million people immunized. The risk of severe illness and death from flu is many times greater.
