Dr. Weeks’ Comment:
The immune response to vaccination may first damage the gut, followed by the brain.
This landmark MS paper describes such a situation:
https://www.sciencedaily.com/releases/2014/09/140904084603.htm
Three (3) recent papers about regulation of myelin and brain inflammation by gut microbiota:
https://www.theguardian.com/science/neurophilosophy/2016/apr/05/gut-bacteria-brain-myelin?CMP=share_btn_tw
https://www.sciencedaily.com/releases/2016/04/160420104209.htm