I heard the flu shot can activate Guillain-Barré.
43% of Americans Risked Their Brain Health for Flu Shots - Did You?
https://www.google.com/url?q=http://articles.mercola.com/sites/articles/archive/2011/11/24/more-people-getting-flu-shots.aspx&sa=U&ved=0ahUKEwi3s-eRq-3OAhUGJR4KHeSND4UQFggFMAA&client=internal-uds-cse&usg=AFQjCNFQXbIeMwq-JyI3r9BLSFjrobJ3mQ