Only one or two people per million injected with the flu vaccine contract Guillain-Barre Syndrome (GBS). The condition is more prone to develop during an active flu outbreak than through a flu vaccine injection. 70 percent of all individuals who contract GBS fully recover, though this can take between a few weeks and a few years. GBS damages the nervous system and causes symptoms such as muscle weakness, numbness, and even paralysis. There is no known connection between the disease and the nasal flu vaccine.

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